Science.gov

Sample records for single-pass radar interferometer

  1. The Glacier and Ice Surface Topography Interferometer: UAVSAR's Single-pass Ka-Band Interferometer

    NASA Astrophysics Data System (ADS)

    Moller, D.; Hensley, S.; Wu, X.; Michel, T.; Muellerschoen, R.; Carswell, J.; Fisher, C.; Miller, T.; Milligan, L.; Sadowy, G.; Sanchez-Barbetty, M.; Lou, Y.

    2013-12-01

    In May 2009 a new radar technique for mapping ice surface topography was demonstrated in a Greenland campaign as part of the NASA International Polar Year (IPY) activities. This was achieved with the airborne Glacier and Ice Surface Topography Interferometer (GLISTIN-A): a 35.6 GHz single-pass interferometer. The proof-of-concept demonstration was achieved by interfacing Ka-band RF and antenna hardware with the Uninhabited Airborne Vehicle Synthetic Aperture Radar (UAVSAR). The GLISTIN-A was implemented as a custom installation of the NASA Dryden Flight Research Center Gulfstream III. Instrument performance indicated swath widths over the ice between 5-7km, with height precisions ranging from 30cm-3m at a posting of 3m x 3m. Following the success of the IPY campaign, the Earth Science Techonology Office (ESTO) Airborne Innovative Technology Transition (AITT) program funded the upgrade of GLISTIN-A to a permanently-available pod-only system compatible with unpressurized operation. The AITT made three fundamental upgrades to improve system performance: 1. State-of-the-art solid-state power amplifiers (80W peak) were integrated directly on the antenna panel reducing front-end losses; 2. A ping-pong capability was incorporated to effectively double the baseline thereby improving height measurement precision by a factor of two; and 3. A high-fidelity calibration loop was implemented which is critical for routine processing. Upon completion of our engineering flights in February 2013, GLISTIN-A flew a brief campaign to Alaska (4/24-4/27/13). The purpose was to fully demonstrate GLISTIN-A's ability to generate high-precision, high resolution maps of ice surface topography with swaths in excess of 10km. Furthermore, the question of the utility of GLISTIN-A for sea-ice mapping, tracking and inventory has received a great deal of interest. To address this GLISTIN-A collected data over sea-ice in the Beaufort sea including an underflight of CryoSAT II. Note that there are ongoing activities to stage GLISTIN on the Global Hawk (GLISTIN-H) for which sea ice-mapping is a primary driver. Analysis of the data will focus on assessment of performance and interpretation over ice to include: 1. intercomparison of GLISTIN-A glacier height maps with lidar data and heritage SRTM DEM's for performance validation of GLISTIN-A over ice, 2. quantitative evaluation of mass change over the Columbia glacier via repeat observations made by GLISTIN-A with a 3 day separation, 3. assessment of GLISTIN-A's ability map sea ice extent, dynamics and possibly to measure freeboard.

  2. EcoSAR: NASA's P-band fully polarimetric single pass interferometric airborne radar

    NASA Astrophysics Data System (ADS)

    Osmanoglu, B.; Rincon, R. F.; Fatoyinbo, T. E.; Lee, S. K.; Sun, G.; Daniyan, O.; Harcum, M. E.

    2014-12-01

    EcoSAR is a new airborne synthetic aperture radar imaging system, developed at the NASA Goddard Space Flight Center. It is a P-band sensor that employs a non-conventional and innovative design. The EcoSAR system was designed as a multi-disciplinary instrument to image the 3-dimensional surface of the earth from a single pass platform with two antennas. EcoSAR's principal mission is to penetrate the forest canopy to return vital information about the canopy structure and estimate biomass. With a maximum bandwidth of 200 MHz in H and 120 MHz in V polarizations it can provide sub-meter resolution imagery of the study area. EcoSAR's dual antenna, 32 transmit and receive channel architecture provides a test-bed for developing new algorithms in InSAR data processing such as single pass interferometry, full polarimetry, post-processing synthesis of multiple beams, simultaneous measurement over both sides of the flight track, selectable resolution and variable incidence angle. The flexible architecture of EcoSAR will create new opportunities in radar remote sensing of forest biomass, permafrost active layer thickness, and topography mapping. EcoSAR's first test flight occurred between March 27th and April 1st, 2014 over the Andros Island in Bahamas and Corcovado and La Selva National Parks in Costa Rica. The 32 channel radar system collected about 6 TB of radar data in about 12 hours of data collection. Due to the existence of radio and TV communications in the operational frequency band, acquired data contains strong radar frequency interference, which had to be removed prior to beamforming and focusing. Precise locations of the antennas are tracked using high-rate GPS and inertial navigation units, which provide necessary information for accurate processing of the imagery. In this presentation we will present preliminary imagery collected during the test campaign, show examples of simultaneous dual track imaging, as well as a single pass interferogram. The interferometric product will be compared against existing DEMs for quality assessment.

  3. Information content of a single pass of phase-delay data from a short baseline connected element interferometer

    NASA Technical Reports Server (NTRS)

    Thurman, S. W.

    1990-01-01

    An analytic development of the information array obtained with a single tracking pass of phase-delay measurements made from a short baseline interferometer is presented. Phase-delay observations can be made with great precision from two antennas using a single, common distributed frequency standard, hence the name connected element. With the information array, closed-form expressions are developed for the error covariance in declination and right ascension. These equations serve as useful tools for analyzing the relative merits of candidate station locations for connected element interferometry (CEI). The navigation performance of a short baseline interferometer located at the Deep Space Network's (DSN's) Goldstone intracomplex is compared with that which is presently achievable using Very Long Baseline Interferometry (VLBI) over intercontinental baselines. The performance of an intracomplex pair of short baselines formed by three stations is also investigated, along with the use of a single baseline in conjunction with conventional two-way Doppler data. The phase-delay measurement accuracy and data rate used in the analysis are based on the expected performance of an experimental connected element system presently under construction at Goldstone. The results indicate that the VLBI system that will be used during the Galileo mission can determine the declination and right ascension of a distant spacecraft to an accuracy of 20 to 25 nrad, while the CEI triad system and the combination of CEI-Doppler system are both capable of 30 to 70 nrad performance.

  4. Radar interferometer calibration of the EISCAT Svalbard Radar and a additional receiver station

    NASA Astrophysics Data System (ADS)

    Schlatter, N. M.; Grydeland, T.; Ivchenko, N.; Belyey, V.; Sullivan, J.; La Hoz, C.; Blixt, M.

    2013-12-01

    The EISCAT Svalbard Radar has two parabolic dishes. In order to attempt to implement radar aperture synthesis imaging methods three smaller, passive receive array antennas were built. Several science goals for this new receiver system exist, the primary of which is to study so called naturally enhanced ion acoustic lines. In order to compare radar aperture synthesis imaging results with measurements from optical imagers, calibration of the radar interferometer system is necessary. In this work we present the phase calibration of the EISCAT Svalbard interferometer including one array antenna. The calibration was done using the coherent scatter from satellites passing through the radar beam. Optical signatures of the satellite transits provide accurate position for the satellites. Using transits of a number of satellites sufficient for mapping the radar beam, the interferometric cross-phase was fitted within the radar beam. The calibration technique presented in this work will be applied to all antenna pairs of the antenna configuration for future interferometry studies.

  5. TanDEM-X: A radar interferometer with two formation-flying satellites

    NASA Astrophysics Data System (ADS)

    Krieger, Gerhard; Zink, Manfred; Bachmann, Markus; Bräutigam, Benjamin; Schulze, Daniel; Martone, Michele; Rizzoli, Paola; Steinbrecher, Ulrich; Walter Antony, John; De Zan, Francesco; Hajnsek, Irena; Papathanassiou, Kostas; Kugler, Florian; Rodriguez Cassola, Marc; Younis, Marwan; Baumgartner, Stefan; López-Dekker, Paco; Prats, Pau; Moreira, Alberto

    2013-08-01

    TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurements) is an innovative formation-flying radar mission that opens a new era in spaceborne radar remote sensing. The primary objective is the acquisition of a global digital elevation model (DEM) with unprecedented accuracy (12 m horizontal resolution and 2 m relative height accuracy). This goal is achieved by extending the TerraSAR-X synthetic aperture radar (SAR) mission by a second, TerraSAR-X like satellite (TDX) flying in close formation with TerraSAR-X (TSX). Both satellites form together a large single-pass SAR interferometer with the opportunity for flexible baseline selection. This enables the acquisition of highly accurate cross-track interferograms without the inherent accuracy limitations imposed by repeat-pass interferometry due to temporal decorrelation and atmospheric disturbances. Besides the primary goal of the mission, several secondary mission objectives based on along-track interferometry as well as new bistatic and multistatic SAR techniques have been defined, representing an important and innovative asset of the TanDEM-X mission. TanDEM-X is implemented in the framework of a public-private partnership between the German Aerospace Center (DLR) and EADS Astrium GmbH. The TanDEM-X satellite was successfully launched in June 2010 and the mission started its operational data acquisition in December 2010. This paper provides an overview of the TanDEM-X mission and summarizes its actual status and performance. Furthermore, results from several scientific radar experiments are presented that show the great potential of future formation-flying interferometric SAR missions to serve novel remote sensing applications.

  6. Radar Interferometer for Topographic Mapping of Glaciers and Ice Sheets

    NASA Technical Reports Server (NTRS)

    Moller, Delwyn K.; Sadowy, Gregory A.; Rignot, Eric J.; Madsen, Soren N.

    2007-01-01

    A report discusses Ka-band (35-GHz) radar for mapping the surface topography of glaciers and ice sheets at high spatial resolution and high vertical accuracy, independent of cloud cover, with a swath-width of 70 km. The system is a single- pass, single-platform interferometric synthetic aperture radar (InSAR) with an 8-mm wavelength, which minimizes snow penetration while remaining relatively impervious to atmospheric attenuation. As exhibited by the lower frequency SRTM (Shuttle Radar Topography Mission) AirSAR and GeoSAR systems, an InSAR measures topography using two antennas separated by a baseline in the cross-track direction, to view the same region on the ground. The interferometric combination of data received allows the system to resolve the pathlength difference from the illuminated area to the antennas to a fraction of a wavelength. From the interferometric phase, the height of the target area can be estimated. This means an InSAR system is capable of providing not only the position of each image point in along-track and slant range as with a traditional SAR but also the height of that point through interferometry. Although the evolution of InSAR to a millimeter-wave center frequency maximizes the interferometric accuracy from a given baseline length, the high frequency also creates a fundamental problem of swath coverage versus signal-to-noise ratio. While the length of SAR antennas is typically fixed by mass and stowage or deployment constraints, the width is constrained by the desired illuminated swath width. As the across-track beam width which sets the swath size is proportional to the wavelength, a fixed swath size equates to a smaller antenna as the frequency is increased. This loss of antenna size reduces the two-way antenna gain to the second power, drastically reducing the signal-to-noise ratio of the SAR system. This fundamental constraint of high-frequency SAR systems is addressed by applying digital beam-forming (DBF) techniques to synthesize multiple simultaneous receive beams in elevation while maintaining a broad transmit illumination. Through this technique, a high antenna gain on receive is preserved, thereby reducing the required transmit power and thus enabling high-frequency SARs and high-precision InSAR from a single spacecraft.

  7. Mutual coupling of antennas in a meteor radar interferometer

    NASA Astrophysics Data System (ADS)

    Younger, J. P.; Reid, I. M.; Vincent, R. A.

    2013-03-01

    Abstract Meteor <span class="hlt">radars</span> have become common and important tools in the study of the climate and dynamics of the mesosphere/lower thermosphere (MLT) region. These systems depend on accurate angle-of-arrival measurements to locate the positions of meteor trails in the atmosphere. Mutual coupling between antennas, although small, produces a measurable error in the antenna pair phase differences used to deduce the angle of arrival of incident radiation. Measurements of the scattering parameter matrix for antennas in an interferometric meteor <span class="hlt">radar</span> array have been made and applied to the existing angle-of-arrival calculation algorithm. The results indicate that mutual coupling of antennas in the array produces errors in the zenith angle estimate of less than ± 0.5°. This error is primarily in the form of a gradient across the field of view of the <span class="hlt">radar</span>, which can be removed using existing phase calibration methods. The remaining error is small but will produce small systematic variations in the height estimates for detected meteors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5812915','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5812915"><span id="translatedtitle">The altitude of type 3 auroral irregularities: <span class="hlt">Radar</span> <span class="hlt">interferometer</span> observations and implications</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sahr, J.D.; Farley, D.T.; Swartz, W.E. ); Providakes, J.F. )</p> <p>1991-10-01</p> <p>VHF coherent scatter <span class="hlt">radars</span> at auroral latitudes have observed scatterers with narrow power spectra at sub-ion acoustic mean Doppler shifts. These spectra have been designated type 3. The mean Doppler shift of these waves is often near the atomic (O{sup +}) or, less frequently, the molecular (O{sub 2}{sup +} and NO{sup +}) gyro frequencies. These type 3 echoes have been attributed to an electrostatic ion-cyclotron (EIC) instability in the upper E region (h > 140 km), where the ion collision frequency becomes low enough to permit ion gyromotion. Interferometric analysis of recent coherent <span class="hlt">radar</span> observations with the CUPRI (Cornell University portable <span class="hlt">radar</span> <span class="hlt">interferometer</span>) shows that type 3 events occur at typical electrojet altitudes (100-120 km), however. At these altitudes the ion collision frequency is greater than the ion gyrofrequency and there can be no cyclotron motion. The cause of the observed type 3 echoes hence remains a mystery.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20120001227','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20120001227"><span id="translatedtitle">Onboard Interferometric SAR Processor for the Ka-Band <span class="hlt">Radar</span> <span class="hlt">Interferometer</span> (KaRIn)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Esteban-Fernandez, Daniel; Rodriquez, Ernesto; Peral, Eva; Clark, Duane I.; Wu, Xiaoqing</p> <p>2011-01-01</p> <p>An interferometric synthetic aperture <span class="hlt">radar</span> (SAR) onboard processor concept and algorithm has been developed for the Ka-band <span class="hlt">radar</span> <span class="hlt">interferometer</span> (KaRIn) instrument on the Surface and Ocean Topography (SWOT) mission. This is a mission- critical subsystem that will perform interferometric SAR processing and multi-look averaging over the oceans to decrease the data rate by three orders of magnitude, and therefore enable the downlink of the <span class="hlt">radar</span> data to the ground. The onboard processor performs demodulation, range compression, coregistration, and re-sampling, and forms nine azimuth squinted beams. For each of them, an interferogram is generated, including common-band spectral filtering to improve correlation, followed by averaging to the final 1 1-km ground resolution pixel. The onboard processor has been prototyped on a custom FPGA-based cPCI board, which will be part of the <span class="hlt">radar</span> s digital subsystem. The level of complexity of this technology, dictated by the implementation of interferometric SAR processing at high resolution, the extremely tight level of accuracy required, and its implementation on FPGAs are unprecedented at the time of this reporting for an onboard processor for flight applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AnGeo..33..837S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AnGeo..33..837S"><span id="translatedtitle">Auroral ion acoustic wave enhancement observed with a <span class="hlt">radar</span> <span class="hlt">interferometer</span> system</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Schlatter, N. M.; Belyey, V.; Gustavsson, B.; Ivchenko, N.; Whiter, D.; Dahlgren, H.; Tuttle, S.; Grydeland, T.</p> <p>2015-07-01</p> <p>Measurements of naturally enhanced ion acoustic line (NEIAL) echoes obtained with a five-antenna interferometric imaging <span class="hlt">radar</span> system are presented. The observations were conducted with the European Incoherent SCATter (EISCAT) <span class="hlt">radar</span> on Svalbard and the EISCAT Aperture Synthesis Imaging receivers (EASI) installed at the <span class="hlt">radar</span> site. Four baselines of the <span class="hlt">interferometer</span> are used in the analysis. Based on the coherence estimates derived from the measurements, we show that the enhanced backscattering region is of limited extent in the plane perpendicular to the geomagnetic field. Previously it has been argued that the enhanced backscatter region is limited in size; however, here the first unambiguous observations are presented. The size of the enhanced backscatter region is determined to be less than 900 × 500 m, and at times less than 160 m in the direction of the longest antenna separation, assuming the scattering region to have a Gaussian scattering cross section in the plane perpendicular to the geomagnetic field. Using aperture synthesis imaging methods volumetric images of the NEIAL echo are obtained showing the enhanced backscattering region to be aligned with the geomagnetic field. Although optical auroral emissions are observed outside the <span class="hlt">radar</span> look direction, our observations are consistent with the NEIAL echo occurring on field lines with particle precipitation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/910813','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/910813"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">Pass</span> Multi-component Harvester</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Reed Hoskinson; J. Richard Hess</p> <p>2004-08-01</p> <p>Abstract. In order to meet the U. S. government’s goal of supplementing the energy available from petroleum by increasing the production of energy from renewable resources, increased production of bioenergy has become one of the new goals of the United States government and our society. U.S. Executive Orders and new Federal Legislation have mandated changes in government procedures and caused reorganizations within the government to support these goals. The Biomass Research and Development Initiative is a multi-agency effort to coordinate and accelerate all U.S. Federal biobased products and bioenergy research and development. The Initiative is managed by the National Biomass Coordination Office, which is staffed by both the DOE and the USDA. One of the most readily available sources of biomass from which to produce bioenergy is an agricultural crop residue, of which straw from small grains is the most feasible residue with which to start. For the straw residue to be used its collection must be energy efficient and its removal must not impact the sustainability of the growing environment. In addition, its collection must be economically advantageous to the producer. To do all that, a <span class="hlt">single</span> <span class="hlt">pass</span> multi-component harvester system is most desirable. Results from our first prototype suggest that current combines probably do adequate threshing and that a separate chassis can be developed that does additional separation and that is economically feasible.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/910832','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/910832"><span id="translatedtitle">The <span class="hlt">Single</span> <span class="hlt">Pass</span> Multi-component Harvester</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Reed Hoskinson; John R. Hess</p> <p>2004-08-01</p> <p>The authors are solely responsible for the content of this technical presentation. The technical presentation does not necessarily reflect the official position of the American Society of Agricultural Engineers (ASAE), and its printing and distribution does not constitute an endorsement of views which may be expressed. Technical presentations are not subject to the formal peer review process by ASAE editorial committees; therefore, they are not to be presented as refereed publications. Citation of this work should state that it is from an ASAE meeting paper. EXAMPLE: Author's Last Name, Initials. 2004. Title of Presentation. ASAE Paper No. 04xxxx. St. Joseph, Mich.: ASAE. For information about securing permission to reprint or reproduce a technical presentation, please contact ASAE at hq@asae.org or 269-429-0300 (2950 Niles Road, St. Joseph, MI 49085-9659 USA). Abstract. In order to meet the U. S. government’s goal of supplementing the energy available from petroleum by increasing the production of energy from renewable resources, increased production of bioenergy has become one of the new goals of the United States government and our society. U.S. Executive Orders and new Federal Legislation have mandated changes in government procedures and caused reorganizations within the government to support these goals. The Biomass Research and Development Initiative is a multi-agency effort to coordinate and accelerate all U.S. Federal biobased products and bioenergy research and development. The Initiative is managed by the National Biomass Coordination Office, which is staffed by both the DOE and the USDA. One of the most readily available sources of biomass from which to produce bioenergy is an agricultural crop residue, of which straw from small grains is the most feasible residue with which to start. For the straw residue to be used its collection must be energy efficient and its removal must not impact the sustainability of the growing environment. In addition, its collection must be economically advantageous to the producer. To do all that, a <span class="hlt">single</span> <span class="hlt">pass</span> multi-component harvester system is most desirable. Results from our first prototype suggest that current combines probably do adequate threshing and that a separate chassis can be developed that does additional separation and that is economically feasible.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/9272534','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/9272534"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">pass</span> lead VDD pacing in children and adolescents.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rosenheck, S; Elami, A; Amikam, S; Erdman, S; Ovsyshcher, I E</p> <p>1997-08-01</p> <p>Implantation of permanent pacemakers in children and adolescents is possible but usually is limited to single chamber generators. The natural growth of these patients may require physiological pacing, but until recently two leads were required for this type of pacing. The <span class="hlt">single</span> <span class="hlt">pass</span> lead VDD pacing mode makes possible physiological pacing by using only one lead, for both atrial sensing and ventricular sensing and pacing. The feasibility of VDD pacing using endocardial lead was evaluated in 16 children and adolescents with congenital or postsurgical atrioventricular block. Their mean age was 7.9 +/- 4.9 years (range 1-16 years) and the smallest patient's weight was 8.2 kg. In all the patients, a <span class="hlt">single</span> <span class="hlt">pass</span> pacing lead with atrial sensing rings and bipolar ventricular pacing and sensing capability was implanted through the left or right subclavian vein. The pacemaker generator was implanted in a rectopectoral position. The mean atrial electrogram during the implantation was 4.2 +/- 2.1 mV and 2.6 +/- 1.9 mV after a mean of 1 week. The ventricular pacing threshold was 0.5 +/- 0.2 V; the ventricular pacing impedance was 560 +/- 95 omega; and the ventricular electrogram amplitude was 9.9 +/- 2.1 mV. This is a first report to demonstrate the feasibility of atrial synchronous ventricular endocardial pacing using a <span class="hlt">single</span> <span class="hlt">pass</span> lead in a relatively large group of children and adolescents. PMID:9272534</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/9272536','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/9272536"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">pass</span> VDD pacing in children and adolescents.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rosenthal, E; Bostock, J; Qureshi, S A; Baker, E J; Tynan, M</p> <p>1997-08-01</p> <p>Use of a <span class="hlt">single</span> <span class="hlt">pass</span> lead for VDD pacing in complete heart block is well described in adults, but there are only brief reports of its use in children. We have used standard adult size <span class="hlt">single</span> <span class="hlt">pass</span> leads in 13 children and adolescents aged 3.7-17.2 years (mean 10.1 years) and weighing 13.5-76 kg (mean 34.8 kg). Congenital complete heart block was present in 7 patients, surgical complete heart block in 5 patients and 2:1 AV block of unknown cause in 1 patient. In four patients, the VDD system was their first pacing system. In nine of the patients, 1-6 previous systems had been used and simultaneous extraction of ventricular leads and/or atrial leads was performed. Leads of four different types were used: Brilliant IMP15Q, Brilliant + IMR15Q, CapSure 5032, and Unipass 425-13 with 4 different generators: Saphir 600, Saphir II 620, Thera VDD 8948, and Unity 292-07. At implantation, via a subclavian vein puncture, excess lead was advanced into the right atrium to allow both atrial sensing and slack for further growth. Ventricular thresholds ranged from 0.2-0.7 V. The minimal atrial amplitude was 0.7-4 mV and the maximum amplitude was 2.5-8 mV. There were no complications. All patients have maintained adequate atrial signals for reliable pacing with follow up of 3-36 months (mean 17.6 months) during which time some have undergone considerable growth. Reliable atrial synchronous ventricular pacing is possible in growing children with complete heart block using a standard adult <span class="hlt">single</span> <span class="hlt">pass</span> lead. PMID:9272536</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JGRA..120.8989J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JGRA..120.8989J"><span id="translatedtitle">Observations of storm time midlatitude ion-neutral coupling using SuperDARN <span class="hlt">radars</span> and NATION Fabry-Perot <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Joshi, P. P.; H. Baker, J. B.; Ruohoniemi, J. M.; Makela, J. J.; Fisher, D. J.; Harding, B. J.; Frissell, N. A.; Thomas, E. G.</p> <p>2015-10-01</p> <p>Ion drag is known to play an important role in driving neutral thermosphere circulation at auroral latitudes, especially during the main phase of geomagnetic storms. During the recovery phase, the neutrals are known to drive the ions and generate ionospheric electric fields and currents via the disturbance dynamo mechanism. At midlatitudes, the precise interplay between ions and neutrals is less understood largely because of the paucity of measurements that have been available. In this work, we investigate ion-neutral coupling at middle latitudes using colocated ion drift velocity measurements obtained from Super Dual Auroral <span class="hlt">Radar</span> Network <span class="hlt">radars</span> and neutral wind velocity and temperature measurements obtained from the North American Thermosphere Ionosphere Observing Network (NATION) Fabry-Perot <span class="hlt">interferometers</span>. We examine one recent storm period on 2-3 October 2013 during both the main phase and late recovery phase. By using ion-neutral momentum exchange theory and a time-lagged correlation analysis, we analyze the coupling time scales and dominant driving mechanisms. We observe that during the main phase the neutrals respond to the ion convection on a time scale of ˜84 min which is significantly faster than what would be expected from local ion drag momentum forcing alone. This suggests that other storm time influences are important for driving the neutrals during the main phase, such as Joule heating. During the late recovery phase, the neutrals are observed to drive the ion convection without any significant time delay, consistent with the so-called "neutral fly wheel effect" or disturbance dynamo persisting well into the late recovery phase.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20070030942&hterms=514&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3D514','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20070030942&hterms=514&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3D514"><span id="translatedtitle">Error Analysis for High Resolution Topography with Bi-Static <span class="hlt">Single-Pass</span> SAR Interferometry</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Muellerschoen, Ronald J.; Chen, Curtis W.; Hensley, Scott; Rodriguez, Ernesto</p> <p>2006-01-01</p> <p>We present a flow down error analysis from the <span class="hlt">radar</span> system to topographic height errors for bi-static <span class="hlt">single</span> <span class="hlt">pass</span> SAR interferometry for a satellite tandem pair. Because of orbital dynamics the baseline length and baseline orientation evolve spatially and temporally, the height accuracy of the system is modeled as a function of the spacecraft position and ground location. Vector sensitivity equations of height and the planar error components due to metrology, media effects, and <span class="hlt">radar</span> system errors are derived and evaluated globally for a baseline mission. Included in the model are terrain effects that contribute to layover and shadow and slope effects on height errors. The analysis also accounts for nonoverlapping spectra and the non-overlapping bandwidth due to differences between the two platforms' viewing geometries. The model is applied to a 514 km altitude 97.4 degree inclination tandem satellite mission with a 300 m baseline separation and X-band SAR. Results from our model indicate that global DTED level 3 can be achieved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20060043796&hterms=TURTLE&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3DTURTLE','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20060043796&hterms=TURTLE&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3DTURTLE"><span id="translatedtitle">Fine resolution topographic mapping of the Jovian moons: a Ka-band high resolution topographic mapping interferometric synthetic aperture <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Madsen, Soren N.; Carsey, Frank D.; Turtle, Elizabeth P.</p> <p>2003-01-01</p> <p>The topographic data set obtained by MOLA has provided an unprecedented level of information about Mars' geologic features. The proposed flight of JIMO provides an opportunity to accomplish a similar mapping of and comparable scientific discovery for the Jovian moons through us of an interferometric imaging <span class="hlt">radar</span> analogous to the Shuttle <span class="hlt">radar</span> that recently generated a new topographic map of Earth. A Ka-band <span class="hlt">single</span> <span class="hlt">pass</span> across-track synthetic aperture <span class="hlt">radar</span> (SAR) <span class="hlt">interferometer</span> can provide very high resolution surface elevation maps. The concept would use two antennas mounted at the ends of a deployable boom (similar to the Shuttle <span class="hlt">Radar</span> Topographic Mapper) extended orthogonal to the direction of flight. Assuming an orbit altitude of approximately 100 km and a ground velocity of approximately 1.5 km/sec, horizontal resolutions at the 10 meter level and vertical resolutions at the sub-meter level are possible.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20030066037&hterms=TURTLE&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3DTURTLE','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20030066037&hterms=TURTLE&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3DTURTLE"><span id="translatedtitle">Fine Resolution Topographic Mapping of the Jovian Moons: A Ka-Band High Resolution Topographic Mapping Interferometric Synthetic Aperture <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Madsen, S. N.; Carsey, F. D.; Turtle, E. P.</p> <p>2003-01-01</p> <p>The topographic data set obtained by MOLA has provided an unprecedented level of information about Mars' geologic features. The proposed flight of JIMO provides an opportunity to accomplish a similar mapping of and comparable scientific discovery for the Jovian moons through use of an interferometric imaging <span class="hlt">radar</span> analogous to the Shuttle <span class="hlt">radar</span> that recently generated a new topographic map of Earth. A Ka-band <span class="hlt">single</span> <span class="hlt">pass</span> across-track synthetic aperture <span class="hlt">radar</span> (SAR) <span class="hlt">interferometer</span> can provide very high resolution surface elevation maps. The concept would use two antennas mounted at the ends of a deployable boom (similar to the Shuttle <span class="hlt">Radar</span> Topographic Mapper) extended orthogonal to the direction of flight. Assuming an orbit altitude of approximately 100km and a ground velocity of approximately 1.5 km/sec, horizontal resolutions at the 10 meter level and vertical resolutions at the sub-meter level are possible.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000053500','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000053500"><span id="translatedtitle">The Shuttle <span class="hlt">Radar</span> Topography Mission: A Global DEM</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Farr, Tom G.; Kobrick, Mike</p> <p>2000-01-01</p> <p>Digital topographic data are critical for a variety of civilian, commercial, and military applications. Scientists use Digital Elevation Models (DEM) to map drainage patterns and ecosystems, and to monitor land surface changes over time. The mountain-building effects of tectonics and the climatic effects of erosion can also be modeled with DEW The data's military applications include mission planning and rehearsal, modeling and simulation. Commercial applications include determining locations for cellular phone towers, enhanced ground proximity warning systems for aircraft, and improved maps for backpackers. The Shuttle <span class="hlt">Radar</span> Topography Mission (SRTM) (Fig. 1), is a cooperative project between NASA and the National Imagery and Mapping Agency (NIMA) of the U.S. Department of Defense. The mission is designed to use a <span class="hlt">single-pass</span> <span class="hlt">radar</span> <span class="hlt">interferometer</span> to produce a digital elevation model of the Earth's land surface between about 60 degrees north and south latitude. The DEM will have 30 m pixel spacing and about 15 m vertical errors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.C13C0695F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.C13C0695F"><span id="translatedtitle">Ground-based portable <span class="hlt">radar</span> <span class="hlt">interferometer</span> for imaging glacier flow, ocean-glacier ice interactions, and river ice breakup</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fahnestock, M. A.; Cassotto, R.; Truffer, M.</p> <p>2013-12-01</p> <p>Over the last 18 months we have deployed new 17 GHz imaging <span class="hlt">radars</span> from Gamma Remote Sensing to document flow on land terminating and tidewater glaciers in Greenland and Alaska; to image glacier response to tides and calving; to track floating ice in fjords; and to document river ice movement, ice jams, and associated flooding during breakup on the Tanana River in Alaska. During these deployments we have learned much about atmospheric influences on interferometric measurements; combination of flow direction determinations from feature tracking in amplitude imagery with short-term flow variability from interferometry. We show examples documenting measurement capabilities and limitations from each of these deployments. These <span class="hlt">radars</span> represent unique tools for study of rapid changes in dynamic parts of the cryosphere.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li class="active"><span>1</span></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_1 --> <div id="page_2" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li class="active"><span>2</span></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="21"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26418581','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26418581"><span id="translatedtitle">Global Identification of Protein Post-translational Modifications in a <span class="hlt">Single-Pass</span> Database Search.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shortreed, Michael R; Wenger, Craig D; Frey, Brian L; Sheynkman, Gloria M; Scalf, Mark; Keller, Mark P; Attie, Alan D; Smith, Lloyd M</p> <p>2015-11-01</p> <p>Bottom-up proteomics database search algorithms used for peptide identification cannot comprehensively identify post-translational modifications (PTMs) in a <span class="hlt">single-pass</span> because of high false discovery rates (FDRs). A new approach to database searching enables global PTM (G-PTM) identification by exclusively looking for curated PTMs, thereby avoiding the FDR penalty experienced during conventional variable modification searches. We identified over 2200 unique, high-confidence modified peptides comprising 26 different PTM types in a <span class="hlt">single-pass</span> database search. PMID:26418581</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4642219','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4642219"><span id="translatedtitle">Global Identification of Protein Post-translational Modifications in a <span class="hlt">Single-Pass</span> Database Search</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2015-01-01</p> <p>Bottom-up proteomics database search algorithms used for peptide identification cannot comprehensively identify post-translational modifications (PTMs) in a <span class="hlt">single-pass</span> because of high false discovery rates (FDRs). A new approach to database searching enables global PTM (G-PTM) identification by exclusively looking for curated PTMs, thereby avoiding the FDR penalty experienced during conventional variable modification searches. We identified over 2200 unique, high-confidence modified peptides comprising 26 different PTM types in a <span class="hlt">single-pass</span> database search. PMID:26418581</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://lamar.colostate.edu/~lidar/Publications/Yue_ppln.pdf','EPRINT'); return false;" href="http://lamar.colostate.edu/~lidar/Publications/Yue_ppln.pdf"><span id="translatedtitle">Continuous-wave sodium D2 resonance radiation generated in <span class="hlt">single-pass</span> sum-frequency</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Continuous-wave sodium D2 resonance radiation generated in <span class="hlt">single-pass</span> sum-frequency generation has been used in a solid-state­dye laser hybrid sodium fluorescence lidar transmitter to measure of a mobile all-solid-state sodium temperature and wind lidar under construction. © 2009 Optical Society</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10176662','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10176662"><span id="translatedtitle">Fuel-element failures in Hanford <span class="hlt">single-pass</span> reactors 1944--1971</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gydesen, S.P.</p> <p>1993-07-01</p> <p>The primary objective of the Hanford Environmental Dose Reconstruction (HEDR) Project is to estimate the radiation dose that individuals could have received as a result of emissions since 1944 from the US Department of Energy`s (DOE) Hanford Site near Richland, Washington. To estimate the doses, the staff of the Source Terms Task use operating information from historical documents to approximate the radioactive emissions. One source of radioactive emissions to the Columbia River came from leaks in the aluminum cladding of the uranium metal fuel elements in <span class="hlt">single-pass</span> reactors. The purpose of this letter report is to provide photocopies of the documents that recorded these failures. The data from these documents will be used by the Source Terms Task to determine the contribution of <span class="hlt">single-pass</span> reactor fuel-element failures to the radioactivity of the reactor effluent from 1944 through 1971. Each referenced fuel-element failure occurring in the Hanford <span class="hlt">single-pass</span> reactors is addressed. The first recorded failure was in 1948, the last in 1970. No records of fuel-element failures were found in documents prior to 1948. Data on the approximately 2000 failures which occurred during the 28 years (1944--1971) of Hanford <span class="hlt">single-pass</span> reactor operations are provided in this report.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://tinker.cc.gatech.edu/symposia/iccd-07.pdf','EPRINT'); return false;" href="http://tinker.cc.gatech.edu/symposia/iccd-07.pdf"><span id="translatedtitle">Combining Cluster Sampling with <span class="hlt">Single</span> <span class="hlt">Pass</span> Methods for Efficient Sampling Regimen Design</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Conte, Thomas M.</p> <p></p> <p>Combining Cluster Sampling with <span class="hlt">Single</span> <span class="hlt">Pass</span> Methods for Efficient Sampling Regimen Design Paul D with slow simulation are further exacerbated. Given these issues, many researchers have devised sampling techniques to reduce simulation time. When cluster sampling techniques are used, care must be taken to remove</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.C42B..07W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.C42B..07W"><span id="translatedtitle">Observations of ice motion changes at the terminus of Hubbard Glacier using co-located ground-based <span class="hlt">radar</span> <span class="hlt">interferometer</span> and LiDAR scanning systems (Invited)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wolken, G. J.; Finnegan, D. C.; Sharp, M. J.; LeWinter, A.; Fahnestock, M. A.; Stevens, R.</p> <p>2013-12-01</p> <p>The tidewater terminus of Hubbard Glacier extends into Disenchantment Bay and currently blocks most of the mouth of Russell Fjord. Recent advances of Hubbard Glacier (1986 and 2002) caused the damming of Russell Fjord, creating one of the largest glacier-dammed lakes on the continent and exposing the community of Yakutat to a host of potential hazards. Detailed observations of the terminus of Hubbard Glacier were conducted during a field campaign in May 2013. Ground-based <span class="hlt">radar</span> <span class="hlt">interferometer</span> (GBRI) and ground-based light detection and ranging (LiDAR) scanning systems were deployed to observe changes in ice motion in response to calving events and tidal cycles. GBRI and LiDAR units were co-located and data acquisition was synchronized to maximize data recovery and to aid inter-system comparisons. Observations from ground-based scanners were also compared to meteorological and tidal measurements and to time-lapse photography and satellite data. Both ground-based scanning systems capture ice motion at very high resolution, but each offer specific technical and logistical advantages. The combination of these ground-based remote sensing techniques allows us to quantify high-frequency changes in the velocity and surface deformation at the terminus of Hubbard Glacier and to develop a better understanding of the mechanisms associated with advancing tidewater termini.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20150007763&hterms=radar&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dradar','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20150007763&hterms=radar&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dradar"><span id="translatedtitle">KARIN: The Ka-Band <span class="hlt">Radar</span> <span class="hlt">Interferometer</span> for the Proposed Surface Water and Ocean Topography (SWOT) Mission</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Esteban-Fernandez, Daniel; Peral, Eva; McWatters, Dalia; Pollard, Brian; Rodriguez, Ernesto; Hughes, Richard</p> <p>2013-01-01</p> <p>Over the last two decades, several nadir profiling <span class="hlt">radar</span> altimeters have provided our first global look at the ocean basin-scale circulation and the ocean mesoscale at wavelengths longer than 100 km. Due to sampling limitations, nadir altimetry is unable to resolve the small wavelength ocean mesoscale and sub-mesoscale that are responsible for the vertical mixing of ocean heat and gases and the dissipation of kinetic energy from large to small scales. The proposed Surface Water and Ocean Topography (SWOT) mission would be a partnership between NASA, CNES (Centre National d'Etudes Spaciales) and the Canadian Space Agency, and would have as one of its main goals the measurement of ocean topography with kilometer-scale spatial resolution and centimeter scale accuracy. In this paper, we provide an overview of all ocean error sources that would contribute to the SWOT mission.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26625042','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26625042"><span id="translatedtitle">Highly efficient <span class="hlt">single-pass</span> sum frequency generation by cascaded nonlinear crystals.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hansen, Anders K; Andersen, Peter E; Jensen, Ole B; Sumpf, Bernd; Erbert, Götz; Petersen, Paul M</p> <p>2015-12-01</p> <p>The cascading of nonlinear crystals has been established as a simple method to greatly increase the conversion efficiency of <span class="hlt">single-pass</span> second-harmonic generation compared to a single-crystal scheme. Here, we show for the first time that the technique can be extended to sum frequency generation, despite differences in the phase relations of the involved fields. An unprecedented 5.5 W of continuous-wave diffraction-limited green light is generated from the <span class="hlt">single-pass</span> sum frequency mixing of two diode lasers in two periodically poled nonlinear crystals (conversion efficiency 50%). The technique is generally applicable and can be applied to any combination of fundamental wavelengths and nonlinear crystals. PMID:26625042</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/939971','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/939971"><span id="translatedtitle">Emittance Reduction between EBIS LINAC and Booster by Electron Beam Cooling; Is <span class="hlt">Single</span> <span class="hlt">Pass</span> Cooling Possible?</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hershcovitch,A.</p> <p>2008-04-01</p> <p>Electron beam cooling is examined as an option to reduce momentum of gold ions exiting the EBIS LINAC before injection into the booster. Electron beam parameters are based on experimental data (obtained at BNL) of electron beams extracted from a plasma cathode. Preliminary calculations indicate that <span class="hlt">single</span> <span class="hlt">pass</span> cooling is feasible; momentum spread can be reduced by more than an order of magnitude in less than one meter.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70026197','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70026197"><span id="translatedtitle">Assessing the efficacy of <span class="hlt">single-pass</span> backpack electrofishing to characterize fish community structure</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Meador, M.R.; McIntyre, J.P.; Pollock, K.H.</p> <p>2003-01-01</p> <p>Two-pass backpack electrofishing data collected as part of the U.S. Geological Survey's National Water-Quality Assessment Program were analyzed to assess the efficacy of <span class="hlt">single-pass</span> backpack electrofishing. A two-capture removal model was used to estimate, within 10 river basins across the United States, proportional fish species richness from one-pass electrofishing and probabilities of detection for individual fish species. Mean estimated species richness from first-pass sampling (p??s1) ranged from 80.7% to 100% of estimated total species richness for each river basin, based on at least seven samples per basin. However, p??s1 values for individual sites ranged from 40% to 100% of estimated total species richness. Additional species unique to the second pass were collected in 50.3% of the samples. Of these, cyprinids and centrarchids were collected most frequently. Proportional fish species richness estimated for the first pass increased significantly with decreasing stream width for 1 of the 10 river basins. When used to calculate probabilities of detection of individual fish species, the removal model failed 48% of the time because the number of individuals of a species was greater in the second pass than in the first pass. <span class="hlt">Single-pass</span> backpack electrofishing data alone may make it difficult to determine whether characterized fish community structure data are real or spurious. The two-pass removal model can be used to assess the effectiveness of sampling species richness with a single electrofishing pass. However, the two-pass removal model may have limited utility to determine probabilities of detection of individual species and, thus, limit the ability to assess the effectiveness of <span class="hlt">single-pass</span> sampling to characterize species relative abundances. Multiple-pass (at least three passes) backpack electrofishing at a large number of sites may not be cost-effective as part of a standardized sampling protocol for large-geographic-scale studies. However, multiple-pass electrofishing at some sites may be necessary to better evaluate the adequacy of <span class="hlt">single-pass</span> electrofishing and to help make meaningful interpretations of fish community structure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26625067','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26625067"><span id="translatedtitle"><span class="hlt">Single-pass</span> and omniangle light extraction from light-emitting diodes using transformation optics.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Schumann, Martin F; Abass, Aimi; Gomard, Guillaume; Wiesendanger, Samuel; Lemmer, Uli; Wegener, Martin; Rockstuhl, Carsten</p> <p>2015-12-01</p> <p>We present a light-extraction approach allowing for <span class="hlt">single-pass</span> and omniangle outcoupling of light from light-emitting diodes (LED). By using transformation optics, we perceive a feasible graded-index structure that is a transition from the LED exit facet to a low refractive index region with expanded space that represents air. Apart from the material dispersion of the constituents, our approach is wavelength independent. The suggested extractor is geometrically compact with size parameters comparable to the width of an LED and therefore well adapted for pixelated LEDs. A beam-expanding functionality is possible while fully preserving the outcoupling efficiency by applying index and geometry truncation. PMID:26625067</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/9272518','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/9272518"><span id="translatedtitle">VDD pacing in children with congenital complete heart block: advantages of a <span class="hlt">single</span> <span class="hlt">pass</span> lead.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rosenthal, E; Bostock, J</p> <p>1997-08-01</p> <p>A <span class="hlt">single</span> <span class="hlt">pass</span> lead for VDD pacing in complete heart block is well described in adults but there are only brief reports of its use in children. We used standard adult size <span class="hlt">single</span> <span class="hlt">pass</span> leads in ten children and adolescents aged 3.7-17.2 years (mean 9.9 years) and weighing 13.5-76 kg (mean 35.4 kg) with congenital complete heart block. One patient had coexisting congenital heart disease and had undergone surgery. A 2:1 atrioventricular block in one patient was presumed to be congenital in origin. In four patients, the VDD system was their first pacing system. In six of the patients, 1-4 previous systems had been used and simultaneous extraction of ventricular leads (6) and/or atrial leads (2) was performed. Four different types of lead were used: Brilliant IMP15Q (Vitatron); Brilliant + IMR15Q (Vitatron); CapSure 5032 (Medtronic); and Unipass 425-13 (Intermedics) with four different generators: Saphir 600 (Vitatron); Saphir II 620 (Vitatron); Thera VDD 8948 (Medtronic); and Unity 292-07 (Intermedics). All leads were introduced via a subclavian vein puncture and the atrial dipole was placed low in the right atrium to provide slack for further growth while maintaining atrial sensing. Ventricular thresholds ranged from 0.2-0.8 V. The minimal atrial amplitude was 0.7-4 mV and the maximum amplitude was 2.5-8 mV. There was one early microdisplacement and the lead was repositioned. Over a follow-up period ranging from 1-39 months (mean 20.4 months), all patients have maintained low ventricular pacing thresholds and adequate atrial signals for reliable pacing at rest and with exercise. During this time some have undergone considerable growth. The patient with coexisting congenital heart disease died suddenly at 3 years, but the pacing system had no fault at autopsy. The standard adult size <span class="hlt">single</span> <span class="hlt">pass</span> lead provides a simple means to enable reliable atrial synchronous ventricular pacing in growing children with complete heart block. PMID:9272518</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/907711','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/907711"><span id="translatedtitle">Beam-Beam Simulations for a <span class="hlt">Single</span> <span class="hlt">Pass</span> SuperB-Factory</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Biagini, M.E.; Raimondi, P.; Seeman, J.; Schulte, D.; /CERN</p> <p>2007-05-18</p> <p>A study of beam-beam collisions for an asymmetric <span class="hlt">single</span> <span class="hlt">pass</span> SuperB-Factory is presented [1]. In this scheme an e{sup -} and an e{sup +} beam are first stored and damped in two Damping Rings (DR), then extracted, compressed and focused to the IP. After collision the two beams are re-injected in the DR to be damped and extracted for collision again. The explored beam parameters are similar to those used in the design of the International Linear Collider, except for the beam energies. Flat beams and round beams were compared in the simulations in order to optimize both luminosity performances and beam blowup after collision. With such approach a luminosity of the order of 10{sup 36} cm{sup -2} s{sup -1} can be achieved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/923279','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/923279"><span id="translatedtitle">Development of a 2D Vlasov Solver for <span class="hlt">Single-Pass</span> Systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Venturini, Marco; Warnock, Robert; Zholents, Alexander</p> <p>2006-07-31</p> <p>Direct numerical methods for solving the Vlasov equationoffer some advantages over macroparticle simulations, as they do notsuffer from the numerical noise inherent in using a number ofmacroparticles smaller than the bunch population. Unfortunately thesemethods are more time-consuming and generally considered impractical in afull 6D phase space. However, in a lower-dimension phase space they maybecome attractive if the beam dynamics is sensitive to the presence ofsmall charge-density fluctuations and a high resolution is needed. Inthis paper we present a 2D Vlasov solver for studying the longitudinalbeam dynamics in <span class="hlt">single-pass</span> systems of interest for X-FEL's, wherecharacterization of the microbunching instability is of particularrelevance. The solver includes a model to account for the smearing effectof a finite horizontal emittance on microbuncing. We explore the effectof space charge and coherent synchrotron radiation (CSR). The numericalsolutions are compared with results from linear theory and good agreementis found in the regime where linear theory applies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1007884','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1007884"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">pass</span> electron beam cooling of gold ions between EBIS LINAC and booster is theoretically possible!</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hershcovitch, A.</p> <p>2011-01-01</p> <p>Electron beam cooling is examined as an option to reduce momentum of gold ions exiting the EBIS LINAC before injection into the booster. Electron beam parameters are based on experimental data (obtained at BNL) of electron beams extracted from a plasma cathode. Many issues, regarding a low energy high current electron beam that is needed for electron beam cooling to reduce momentum of gold ions exiting the EBIS LINAC before injection into the booster, were examined. Computations and some experimental data indicate that none of these issues is a show stopper. Preliminary calculations indicate that <span class="hlt">single</span> <span class="hlt">pass</span> cooling is feasible; momentum spread can be reduced by more than an order of magnitude in about one meter. Hence, this option cooling deserves further more serious considerations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/861065','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/861065"><span id="translatedtitle">AN EXPERIMENTAL TEST OF SUPERRADIANCE IN A <span class="hlt">SINGLE</span> <span class="hlt">PASS</span> SEEDED FEL.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>WATANABE, T.; LIU, D.; MURPHY, J.B.; ROSE, J.; SHAFTAN, T.; TSANG, T.; WANG, X.J.; YU, L.H.</p> <p>2005-08-21</p> <p>Superradiance and nonlinear evolution of a FEL pulse in a <span class="hlt">single-pass</span> FEL were experimentally demonstrated at the National Synchrotron Light Source (NSLS) Source Development Laboratory (SDL). The experiment was performed using a 1.5 ps high-brightness electron beam and a 100fs Ti:Sapphire seed laser. The seed laser and electron beam interact in the 10 meter long NISUS undulator with a period of 3.89 cm. The FEL spectrum, energy and pulse length along the undulator were measured. FEL saturation was observed, and gain of more the 200 (relative to seed laser) was measured. Both FEL spectrum widening and pulse length shortening were observed; FEL pulses as short as 65 fs FWHM were measured. The superradiance and nonlinear evolution were also simulated using the numerical code GENESIS1.3 yielding good agreement with the experimental results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/802610','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/802610"><span id="translatedtitle">Technical Progress Report on <span class="hlt">Single</span> <span class="hlt">Pass</span> Flow Through Tests of Ceramic Waste Forms for Plutonium Immobilization</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhao, P.; Roberts, S.; Bourcier, W.L.</p> <p>2000-12-03</p> <p>This report updates work on measurements of the dissolution rates of single-phase and multi-phase ceramic waste forms in flow-through reactors at Lawrence Livermore National Laboratory. Previous results were reported in Bourcier (1999). Two types of tests are in progress: (1) tests of baseline pyrochlore-based multiphase ceramics; and (2) tests of single-phase pyrochlore, zirconolite, and brannerite (the three phases that will contain most of the actinides). Tests of the multi-phase material are all being run at 25 C. The single-phase tests are being run at 25, 50, and 75 C. All tests are being performed at ambient pressure. The as-made bulk compositions of the ceramics are given in Table 1. The <span class="hlt">single</span> <span class="hlt">pass</span> flow-through test procedure [Knauss, 1986 No.140] allows the powdered ceramic to react with pH buffer solutions traveling upward vertically through the powder. Gentle rocking during the course of the experiment keeps the powder suspended and avoids clumping, and allows the system to behave as a continuously stirred reactor. For each test, a cell is loaded with approximately one gram of the appropriate size fraction of powdered ceramic and reacted with a buffer solution of the desired pH. The buffer solution compositions are given in Table 2. All the ceramics tested were cold pressed and sintered at 1350 C in air, except brannerite, which was sintered at 1350 C in a CO/CO{sub 2} gas mixture. They were then crushed, sieved, rinsed repeatedly in alcohol and distilled water, and the desired particle size fraction collected for the <span class="hlt">single</span> <span class="hlt">pass</span> flow-through tests (SPFT). The surface area of the ceramics measured by BET ranged from 0.1-0.35 m{sup 2}/g. The measured surface area values, average particle size, and sample weights for each ceramic test are given in the Appendices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/15004690','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/15004690"><span id="translatedtitle">Technical Progress Report on <span class="hlt">Single</span> <span class="hlt">Pass</span> Flow Through Tests of Ceramic Waste Forms for Plutonium Immobilization</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zhao, P; Roberts, S; Bourcier, W</p> <p>2000-12-01</p> <p>This report updates work on measurements of the dissolution rates of single-phase and multi-phase ceramic waste forms in flow-through reactors at Lawrence Livermore National Laboratory. Previous results were reported in Bourcier (1999). Two types of tests are in progress: (1) tests of baseline pyrochlore-based multiphase ceramics; and (2) tests of single-phase pyrochlore, zirconolite, and brannerite (the three phases that will contain most of the actinides). Tests of the multi-phase material are all being run at 25 C. The single-phase tests are being run at 25, 50, and 75 C. All tests are being performed at ambient pressure. The as-made bulk compositions of the ceramics are given in Table 1. The <span class="hlt">single</span> <span class="hlt">pass</span> flow-through test procedure [Knauss, 1986 No.140] allows the powdered ceramic to react with pH buffer solutions traveling upward vertically through the powder. Gentle rocking during the course of the experiment keeps the powder suspended and avoids clumping, and allows the system to behave as a continuously stirred reactor. For each test, a cell is loaded with approximately one gram of the appropriate size fraction of powdered ceramic and reacted with a buffer solution of the desired pH. The buffer solution compositions are given in Table 2. All the ceramics tested were cold pressed and sintered at 1350 C in air, except brannerite, which was sintered at 1350 C in a CO/CO{sub 2} gas mixture. They were then crushed, sieved, rinsed repeatedly in alcohol and distilled water, and the desired particle size fraction collected for the <span class="hlt">single</span> <span class="hlt">pass</span> flow-through tests (SPFT). The surface area of the ceramics measured by BET ranged from 0.1-0.35 m{sup 2}/g. The measured surface area values, average particle size, and sample weights for each ceramic test are given in the Appendices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JMEP...22.2477L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JMEP...22.2477L"><span id="translatedtitle">Double-Sided <span class="hlt">Single-Pass</span> Submerged Arc Welding for 2205 Duplex Stainless Steel</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Luo, Jian; Yuan, Yi; Wang, Xiaoming; Yao, Zongxiang</p> <p>2013-09-01</p> <p>The duplex stainless steel (DSS), which combines the characteristics of ferritic steel and austenitic steel, is used widely. The submerged arc welding (SAW) method is usually applied to join thick plates of DSS. However, an effective welding procedure is needed in order to obtain ideal DSS welds with an appropriate proportion of ferrite (?) and austenite (?) in the weld zone, particularly in the melted zone and heat-affected zone. This study evaluated the effectiveness of a high efficiency double-sided <span class="hlt">single-pass</span> (DSSP) SAW joining method for thick DSS plates. The effectiveness of the converse welding procedure, characterizations of weld zone, and mechanical properties of welded joint are analyzed. The results show an increasing appearance and continuous distribution feature of the ? phase in the fusion zone of the leading welded seam. The converse welding procedure promotes the ? phase to precipitate in the fusion zone of leading welded side. The microhardness appears to significantly increase in the center of leading welded side. Ductile fracture mode is observed in the weld zone. A mixture fracture feature appears with a shear lip and tears in the fusion zone near the fusion line. The ductility, plasticity, and microhardness of the joints have a significant relationship with ? phase and heat treatment effect influenced by the converse welding step. An available heat input controlling technology of the DSSP formation method is discussed for SAW of thick DSS plates.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26621728','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26621728"><span id="translatedtitle">Augmented Binary Substitution: <span class="hlt">Single-pass</span> CDR germ-lining and stabilization of therapeutic antibodies.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Townsend, Sue; Fennell, Brian J; Apgar, James R; Lambert, Matthew; McDonnell, Barry; Grant, Joanne; Wade, Jason; Franklin, Edward; Foy, Niall; Ní Shúilleabháin, Deirdre; Fields, Conor; Darmanin-Sheehan, Alfredo; King, Amy; Paulsen, Janet E; Hickling, Timothy P; Tchistiakova, Lioudmila; Cunningham, Orla; Finlay, William J J</p> <p>2015-12-15</p> <p>Although humanized antibodies have been highly successful in the clinic, all current humanization techniques have potential limitations, such as: reliance on rodent hosts, immunogenicity due to high non-germ-line amino acid content, v-domain destabilization, expression and formulation issues. This study presents a technology that generates stable, soluble, ultrahumanized antibodies via single-step complementarity-determining region (CDR) germ-lining. For three antibodies from three separate key immune host species, binary substitution CDR cassettes were inserted into preferred human frameworks to form libraries in which only the parental or human germ-line destination residue was encoded at each position. The CDR-H3 in each case was also augmented with 1 ± 1 random substitution per clone. Each library was then screened for clones with restored antigen binding capacity. Lead ultrahumanized clones demonstrated high stability, with affinity and specificity equivalent to, or better than, the parental IgG. Critically, this was mainly achieved on germ-line frameworks by simultaneously subtracting up to 19 redundant non-germ-line residues in the CDRs. This process significantly lowered non-germ-line sequence content, minimized immunogenicity risk in the final molecules and provided a heat map for the essential non-germ-line CDR residue content of each antibody. The ABS technology therefore fully optimizes the clinical potential of antibodies from rodents and alternative immune hosts, rendering them indistinguishable from fully human in a simple, <span class="hlt">single-pass</span> process. PMID:26621728</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li class="active"><span>2</span></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_2 --> <div id="page_3" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li class="active"><span>3</span></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="41"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AIPC.1567.1069C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AIPC.1567.1069C"><span id="translatedtitle">Parametric analysis of plastic strain and force distribution in <span class="hlt">single</span> <span class="hlt">pass</span> metal spinning</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Choudhary, Shashank; Tejesh, Chiruvolu Mohan; Regalla, Srinivasa Prakash; Suresh, Kurra</p> <p>2013-12-01</p> <p>Metal spinning also known as spin forming is one of the sheet metal working processes by which an axis-symmetric part can be formed from a flat sheet metal blank. Parts are produced by pressing a blunt edged tool or roller on to the blank which in turn is mounted on a rotating mandrel. This paper discusses about the setting up a 3-D finite element simulation of <span class="hlt">single</span> <span class="hlt">pass</span> metal spinning in LS-Dyna. Four parameters were considered namely blank thickness, roller nose radius, feed ratio and mandrel speed and the variation in forces and plastic strain were analysed using the full-factorial design of experiments (DOE) method of simulation experiments. For some of these DOE runs, physical experiments on extra deep drawing (EDD) sheet metal were carried out using En31 tool on a lathe machine. Simulation results are able to predict the zone of unsafe thinning in the sheet and high forming forces that are hint to the necessity for less-expensive and semi-automated machine tools to help the household and small scale spinning workers widely prevalent in India.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26628124','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26628124"><span id="translatedtitle">Non-destructive <span class="hlt">single-pass</span> low-noise detection of ions in a beamline.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Schmidt, Stefan; Murböck, Tobias; Andelkovic, Zoran; Birkl, Gerhard; Nörtershäuser, Wilfried; Stahl, Stefan; Vogel, Manuel</p> <p>2015-11-01</p> <p>We have conceived, built, and operated a device for the non-destructive <span class="hlt">single-pass</span> detection of charged particles in a beamline. The detector is based on the non-resonant pick-up and subsequent low-noise amplification of the image charges induced in a cylindrical electrode surrounding the particles' beam path. The first stage of the amplification electronics is designed to be operated from room temperature down to liquid helium temperature. The device represents a non-destructive charge counter as well as a sensitive timing circuit. We present the concept and design details of the device. We have characterized its performance and show measurements with low-energy highly charged ions (such as Ar(13+)) passing through one of the electrodes of a cylindrical Penning trap. This work demonstrates a novel approach of non-destructive, low noise detection of charged particles which is, depending on the bunch structure, suitable, e.g., for ion traps, low-energy beamlines or accelerator transfer sections. PMID:26628124</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012LaPhy..22.1401J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012LaPhy..22.1401J"><span id="translatedtitle">Walk off compensation, multicrystal, cascaded, <span class="hlt">single</span> <span class="hlt">pass</span>, second harmonic generation in LBO</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ji, B.; Zheng, X. S.; Cai, Z. P.; Xu, H. Y.; Jia, F. Q.</p> <p>2012-09-01</p> <p>Walk off compensation and multi crystal (MC) cascaded <span class="hlt">single</span> <span class="hlt">pass</span> second harmonic generation (SP-SHG) in LBO was combined to improve the SHG conversion efficiency. We report a simple and compact implementation for (SP-SHG) of radiation, based on a cascaded multicrystal (MC) scheme that can provide high conversion efficiency without other focusing device, the enhancement factor of 2.9 was realized. At an incident pump power of 20 W, the average power of 6.1 W and pulse width of 12 ns green laser was obtained at a repetition rate of 42.4 kHz, corresponding to a peak power of 12 kW and single pulse energy of 144 ?J. The optical to optical conversion efficiency from diode to green and from IR to green laser are about 30.5 and 67.8%, the whole length of this system is about 150 mm, the output fluctuation of this system is less than 5% in 2 h.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10185463','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10185463"><span id="translatedtitle">Packaging design criteria for the N Reactor/<span class="hlt">single</span> <span class="hlt">pass</span> reactor fuel characterization shipments</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Stevens, P.F.</p> <p>1994-08-31</p> <p>The majority of the spent fuel from the N Reactor and the <span class="hlt">single</span> <span class="hlt">pass</span> reactors (SPR) is presently being stored at the basins in the 100 K Area. Characterization of these fuels is essential to formulate a safe and efficient processing/disposal method for the spent fuel. Consequently, it is necessary to transport a cross section of spent fuel from the K Basins to the hot cells at the 327 Building in the 300 Area for analysis. The CNS 1-13G cask, a US Nuclear Regulatory Commission (NRC) certified cask manufactured by the ChemNuclear company, will be utilized for the transportation for irradiated fuel elements from the K Basins to the 327 Laboratories for characterization. The cask will utilize an inner container to compensate for the possibility of failed fuel cladding and to reduce the chances of contaminating the cask or the off loading facility. The Packaging Design Criteria (PDC) for these shipments establishes the acceptance criteria for the cask and for the design of an inner container that will be used in the Safety Evaluation for Packaging (SEP).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006ApPhA..85..185N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006ApPhA..85..185N"><span id="translatedtitle">Mechanics of <span class="hlt">single</span> <span class="hlt">pass</span> equal channel angular extrusion of powder in tubes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nagasekhar, A. V.; Tick-Hon, Y.; Ramakanth, K. S.</p> <p>2006-11-01</p> <p>In the current study powder in tubes (PITs) are processed through <span class="hlt">single</span> <span class="hlt">pass</span> equal channel angular extrusion (ECAE), for two different powders by using three different tube materials. Studies were conducted for the first time to understand the processing mechanism of ECAE of PITs. In the case of hard brittle intermetallic magnesium boride (MgB2) powder, the process was found to primarily involve compaction and shear-sliding of the powder, and localized-deformation of the tube. Reasons for localized-deformation occurring during ECAE were discussed in detail. Compaction efficiency was understood to depend not only on the material of the tube but also on the homogeneity of stress and strain in the composite PIT. Various frictional stresses and mechanisms of localized-deformation were found to be the reasons for stress-strain inhomogeneity. In the case of copper powder, even though localized-deformation occurred, higher inter-particle friction and low yield strength of the powder helped in the complete densification of the powders.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015RScI...86k3302S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015RScI...86k3302S"><span id="translatedtitle">Non-destructive <span class="hlt">single-pass</span> low-noise detection of ions in a beamline</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Schmidt, Stefan; Murböck, Tobias; Andelkovic, Zoran; Birkl, Gerhard; Nörtershäuser, Wilfried; Stahl, Stefan; Vogel, Manuel</p> <p>2015-11-01</p> <p>We have conceived, built, and operated a device for the non-destructive <span class="hlt">single-pass</span> detection of charged particles in a beamline. The detector is based on the non-resonant pick-up and subsequent low-noise amplification of the image charges induced in a cylindrical electrode surrounding the particles' beam path. The first stage of the amplification electronics is designed to be operated from room temperature down to liquid helium temperature. The device represents a non-destructive charge counter as well as a sensitive timing circuit. We present the concept and design details of the device. We have characterized its performance and show measurements with low-energy highly charged ions (such as Ar13+) passing through one of the electrodes of a cylindrical Penning trap. This work demonstrates a novel approach of non-destructive, low noise detection of charged particles which is, depending on the bunch structure, suitable, e.g., for ion traps, low-energy beamlines or accelerator transfer sections.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22261654','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22261654"><span id="translatedtitle">Parametric analysis of plastic strain and force distribution in <span class="hlt">single</span> <span class="hlt">pass</span> metal spinning</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Choudhary, Shashank E-mail: mohantejesh93@gmail.com E-mail: ksuresh@hyderabad.bits-pilani.ac.in; Tejesh, Chiruvolu Mohan E-mail: mohantejesh93@gmail.com E-mail: ksuresh@hyderabad.bits-pilani.ac.in; Regalla, Srinivasa Prakash E-mail: mohantejesh93@gmail.com E-mail: ksuresh@hyderabad.bits-pilani.ac.in; Suresh, Kurra E-mail: mohantejesh93@gmail.com E-mail: ksuresh@hyderabad.bits-pilani.ac.in</p> <p>2013-12-16</p> <p>Metal spinning also known as spin forming is one of the sheet metal working processes by which an axis-symmetric part can be formed from a flat sheet metal blank. Parts are produced by pressing a blunt edged tool or roller on to the blank which in turn is mounted on a rotating mandrel. This paper discusses about the setting up a 3-D finite element simulation of <span class="hlt">single</span> <span class="hlt">pass</span> metal spinning in LS-Dyna. Four parameters were considered namely blank thickness, roller nose radius, feed ratio and mandrel speed and the variation in forces and plastic strain were analysed using the full-factorial design of experiments (DOE) method of simulation experiments. For some of these DOE runs, physical experiments on extra deep drawing (EDD) sheet metal were carried out using En31 tool on a lathe machine. Simulation results are able to predict the zone of unsafe thinning in the sheet and high forming forces that are hint to the necessity for less-expensive and semi-automated machine tools to help the household and small scale spinning workers widely prevalent in India.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005APS..DPPFO1015B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005APS..DPPFO1015B"><span id="translatedtitle">History of improvements in <span class="hlt">single-pass</span> ICRH ion acceleration in the VASIMR engine</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bering, Edgar; Chang-Diaz, Franklin; Bengtson, Roger D.</p> <p>2005-10-01</p> <p>The Variable Specific Impulse Magnetoplasma Rocket (VASIMR) is a high power magnetoplasma rocket, capable of Isp/thrust modulation at constant power. The plasma is produced by helicon discharge. The bulk of the energy is added by ion cyclotron resonance heating (ICRH.) Axial momentum is obtained by adiabatic expansion of the plasma in a magnetic nozzle. Thrust/specific impulse ratio control in the VASIMR is primarily achieved by the partitioning of the RF power to the helicon and ICRH systems, with the proper adjustment of the propellant flow. Ion dynamics in the exhaust were studied using probes, gridded energy analyzers (RPA's), microwave interferometry and optical techniques. This paper will review 3 years of <span class="hlt">single-pass</span> ICRH ion acceleration data. During this interval, the available power to the helicon ionization stage has increased from 3 to 20 kW. The increased plasma density has produced increased plasma loading of the ICRH antenna and isignificant improvements in antenna coupling efficiency and in ion heating efficiency.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4687607','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4687607"><span id="translatedtitle">Augmented Binary Substitution: <span class="hlt">Single-pass</span> CDR germ-lining and stabilization of therapeutic antibodies</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Townsend, Sue; Fennell, Brian J.; Apgar, James R.; Lambert, Matthew; McDonnell, Barry; Grant, Joanne; Wade, Jason; Franklin, Edward; Foy, Niall; Ní Shúilleabháin, Deirdre; Fields, Conor; Darmanin-Sheehan, Alfredo; King, Amy; Paulsen, Janet E.; Tchistiakova, Lioudmila; Cunningham, Orla; Finlay, William J. J.</p> <p>2015-01-01</p> <p>Although humanized antibodies have been highly successful in the clinic, all current humanization techniques have potential limitations, such as: reliance on rodent hosts, immunogenicity due to high non-germ-line amino acid content, v-domain destabilization, expression and formulation issues. This study presents a technology that generates stable, soluble, ultrahumanized antibodies via single-step complementarity-determining region (CDR) germ-lining. For three antibodies from three separate key immune host species, binary substitution CDR cassettes were inserted into preferred human frameworks to form libraries in which only the parental or human germ-line destination residue was encoded at each position. The CDR-H3 in each case was also augmented with 1 ± 1 random substitution per clone. Each library was then screened for clones with restored antigen binding capacity. Lead ultrahumanized clones demonstrated high stability, with affinity and specificity equivalent to, or better than, the parental IgG. Critically, this was mainly achieved on germ-line frameworks by simultaneously subtracting up to 19 redundant non-germ-line residues in the CDRs. This process significantly lowered non-germ-line sequence content, minimized immunogenicity risk in the final molecules and provided a heat map for the essential non-germ-line CDR residue content of each antibody. The ABS technology therefore fully optimizes the clinical potential of antibodies from rodents and alternative immune hosts, rendering them indistinguishable from fully human in a simple, <span class="hlt">single-pass</span> process. PMID:26621728</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.lehigh.edu/~inemg/assets/Publications/Banovic%20-%20Jan%201999%20-%20The%20Role%20of%20Aluminum.pdf','EPRINT'); return false;" href="http://www.lehigh.edu/~inemg/assets/Publications/Banovic%20-%20Jan%201999%20-%20The%20Role%20of%20Aluminum.pdf"><span id="translatedtitle">ABSTRACT. <span class="hlt">Single-pass</span> welds and multi-ple-pass cladding of Fe-Al alloys were</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>DuPont, John N.</p> <p></p> <p>ABSTRACT. <span class="hlt">Single-pass</span> welds and multi- ple-pass cladding of Fe-Al alloys were deposited on carbon composition on cold cracking suscepti- bility was assessed using a dye penetrant technique. The high of dilution levels was achieved that resulted in fusion zone compositions with 3­30 wt-% Al. Under</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/939985','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/939985"><span id="translatedtitle">Part II/Addendum Electron Beam Cooling between EBIS LINAC and Booster; Is <span class="hlt">Single</span> <span class="hlt">Pass</span> Cooling Possible?</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hershcovitch,A.</p> <p>2008-07-01</p> <p>Due to some miscommunication, incomplete data was erroneously used in examining electron beam cooling for reducing momentum of gold ions exiting the EBIS LINAC before injection into the booster. Corrected calculations still indicate that <span class="hlt">single</span> <span class="hlt">pass</span> cooling is, in principle, feasible; momentum spread can be reduced by an order of magnitude in about one meter. Preliminary results suggest that this cooling deserves further consideration.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010SPIE.7826E..14R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010SPIE.7826E..14R"><span id="translatedtitle">The Surface Water and Ocean Topography Mission (SWOT): the Ka-band <span class="hlt">Radar</span> <span class="hlt">Interferometer</span> (KaRIn) for water level measurements at all scales</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rodriguez, Ernesto; Esteban-Fernandez, Daniel</p> <p>2010-10-01</p> <p>The Surface Water and Ocean Topography (SWOT) mission will study ocean mesoscale and submesoscale phenomena and provide an inventory of storage change and discharge for fresh water bodies and rivers. In this paper, we examine the combination of measurements that will be used by SWOT to achieve a globally consistent data set. We introduce a new channel in the SWOT measurement that combines data transmitted by the <span class="hlt">interferometer</span> antennas and received by the radiometer antenna allows the closing of the SWOT nadir coverage gap. This new mode also allows for improved calibration between the nadir altimeter and the <span class="hlt">interferometer</span>, resulting in consistent range measurements. Consistency in the phase measurements is achieved using a mixture of cross-over calibration combined with optimal estimation of system error drift.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/451204','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/451204"><span id="translatedtitle">Study on a test of optical stochastic cooling scheme in a <span class="hlt">single</span> <span class="hlt">pass</span> beam line</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Chattopadhyay, S.; Kim, C.; Massoletti, D.; Zholents, A.</p> <p>1997-01-01</p> <p>A feasibility study of an experiment to test the principle of optical stochastic cooling is presented. We propose to build a new beamline in the extraction area of the ALS Booster synchrotron, where we will include a bypass lattice similar to the lattice that could be used in the cooling insertion in a storage ring. Of course, in the <span class="hlt">single</span> <span class="hlt">pass</span> beamline we cannot achieve cooling, but we can test all the functions of the bypass lattice that are required to achieve cooling in a storage ring. As it is stated in, there are stringent requirements on the time-of-flight properties of the bypass lattice employed in a cooling scheme. The pathlengths of particle trajectories in the bypass must be fairly insensitive to the standard set of errors that usually affect the performance of storage rings. Namely, it is necessary to preserve all fluctuations in the longitudinal particle density within the beam from the beginning to the end of the bypass lattice with the accuracy of {lambda}/2{pi}, where A is the carrying (optical) wavelength. According to, cooling will completely vanish if a combined effect of all kinds of errors will produce a spread of the pathlengths of particle trajectories larger than {lambda}/2 and the cooling time will almost double if the spread of the pathlengths is {lambda}/2{pi}. At a first glance, {lambda}/2{pi} {approx_equal} 0.1/{mu}m is such a small value that satisfying this accuracy looks nearly impossible. However, simulations show that a carefully designed bypass can meet all the requirements even with rather conservative tolerance to errors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.bu.edu/caadlab/FCCM06_blast.pdf','EPRINT'); return false;" href="http://www.bu.edu/caadlab/FCCM06_blast.pdf"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">Pass</span>, BLAST-Like, Approximate String Matching on FPGAs Martin C. Herbordt Josh Model Yongfeng Gu Bharat Sukhwani Tom VanCourt</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Herbordt, Martin</p> <p></p> <p><span class="hlt">Single</span> <span class="hlt">Pass</span>, BLAST-Like, Approximate String Matching on FPGAs Martin C. Herbordt Josh Model acceleration studies. We ad- dress issues with respect to FPGA implementations of both BLAST- and dynamic and extension phases of BLAST. These operate in a <span class="hlt">single</span> <span class="hlt">pass</span> through a database at streaming rate (110 Maa</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70029165','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70029165"><span id="translatedtitle"><span class="hlt">Single-pass</span> versus two-pass boat electrofishing for characterizing river fish assemblages: Species richness estimates and sampling distance</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Meador, M.R.</p> <p>2005-01-01</p> <p>Determining adequate sampling effort for characterizing fish assemblage structure in nonwadeable rivers remains a critical issue in river biomonitoring. Two-pass boat electrofishing data collected from 500-1,000-m-long river reaches as part of the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program were analyzed to assess the efficacy of <span class="hlt">single-pass</span> boat electrofishing. True fish species richness was estimated by use of a two-pass removal model and nonparametric jackknife estimation for 157 sampled reaches across the United States. Compared with estimates made with a relatively unbiased nonparametric estimator, estimates of true species richness based on the removal model may be biased, particularly when true species richness is greater than 10. Based on jackknife estimation, the mean percent of estimated true species richness collected in the first electrofishing pass (p??j,s1) for all 157 reaches was 65.5%. The effectiveness of <span class="hlt">single-pass</span> boat electrofishing may be greatest when the expected species richness is relatively low (>10 species). The second pass produced additional species (1-13) in 89.2% of sampled reaches. Of these additional species, centrarchids were collected in 50.3% of reaches and cyprinids were collected in 45.9% of reaches. Examination of relations between channel width ratio (reach length divided by wetted channel width) and p??j,s1 values provided no clear recommendation for sampling distances based on channel width ratios. Increasing sampling effort through an extension of the sampled reach distance can increase the percent species richness obtained from <span class="hlt">single-pass</span> boat electrofishing. When <span class="hlt">single-pass</span> boat electrofishing is used to characterize fish assemblage structure, determination of the sampling distance should take into account such factors as species richness and patchiness, the presence of species with relatively low probabilities of detection, and human alterations to the channel.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvS..18g0701L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvS..18g0701L"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">pass</span>, THz spectral range free-electron laser driven by a photocathode hybrid rf linear accelerator</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lurie, Yu.; Friedman, A.; Pinhasi, Y.</p> <p>2015-07-01</p> <p>A <span class="hlt">single</span> <span class="hlt">pass</span>, THz spectral range free-electron laser (FEL) driven by a photocathode hybrid rf-LINAC is considered, taking the Israeli THz FEL project developed in Ariel University as an example. Two possible configurations of such FEL are discussed: an enhanced coherent spontaneous emission FEL, and a prebunched FEL utilizing periodically modulated short electron beam pulses. A general study of the FEL configurations is carried out in the framework of a space-frequency approach, realized in WB3D numerical code. The configurations are studied and compared based on preliminary parameters of a drive hybrid rf-LINAC gun under development in University of California, Los Angeles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0712.3703v1','EPRINT'); return false;" href="http://arxiv.org/pdf/0712.3703v1"><span id="translatedtitle">Atom <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Alexander D. Cronin; Joerg Schmiedmayer; David E. Pritchard</p> <p>2007-12-21</p> <p>Interference with atomic and molecular matter waves is a rich branch of atomic physics and quantum optics. It started with atom diffraction from crystal surfaces and the separated oscillatory fields technique used in atomic clocks. Atom interferometry is now reaching maturity as a powerful art with many applications in modern science. In this review we first describe the basic tools for coherent atom optics including diffraction by nanostructures and laser light, three-grating <span class="hlt">interferometers</span>, and double wells on AtomChips. Then we review scientific advances in a broad range of fields that have resulted from the application of atom <span class="hlt">interferometers</span>. These are grouped in three categories: (1) fundamental quantum science, (2) precision metrology and (3) atomic and molecular physics. Although some experiments with Bose Einstein condensates are included, the focus of the review is on linear matter wave optics, i.e. phenomena where each single atom interferes with itself.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010EGUGA..12.8097D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010EGUGA..12.8097D"><span id="translatedtitle">Using a Ground Based <span class="hlt">radar</span> <span class="hlt">interferometer</span> during emergency: the case of A3 motorway (Salerno Reggio-Calabria) treated by landslide</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Del Ventisette, Chiara; Intrieri, Emanuele; Luzi, Guido; Casagli, Nicola</p> <p>2010-05-01</p> <p>An application of Ground Based <span class="hlt">radar</span> interferometry (GB-InSAR) technique to monitor a landslide threatening infrastructures in emergency conditions is presented. During December 2008 and January 2009 intense rainfalls occurred in Italy, especially in the southern regions. These rain events occurred in the last days of January, worsened the already critical hydrogeological conditions of some areas and triggered many landslides. One of these landslides, named Santa Trada landslide, is located close to a periodical stream called Fiumara di Santa Trada, near Villa San Giovanni municipality (Reggio Calabria, Calabria Region). The volume involved is about 100 000 m3. This estimate represents the case of a collapse of the landslide which destabilize a larger part of the slope, involving other areas delimited by some fractures observed upstream. Nevertheless the landslide does not directly threaten the roadway, its complete collapse would hit the pillars of a motorway viaduct. Through GB-InSAR data it has been possible to obtain an overview of the area affected by movement and to quantify the displacements magnitude. The main benefit of the system was not only limited to the capability of fully characterizing the landslide in spatial terms, it also permitted emergency operators to follow, during the whole campaign, the evolution of the mass movement and to study its cinematic behaviour. This aspect is fundamental to evaluate the volume of the material involved and to assess the temporal evolution of the risk scenario. The GB-InSAR installed at Santa Trada points up toward the landslide from a distance of 250 m. The apparatus produces a synthesized <span class="hlt">radar</span> image of the observed area every 6 minutes, night and day, with a pixel resolution of about 0.75 m in range and 1.2 m on average in cross range, performing a millimeter accuracy on the final displacement maps. The interferometric analysis of sequences of consecutive images allows the operator to derive the entire line of sight (LoS) displacement field of the observed portion of the slope in the elapsed time. Despite the GB-InSAR can measure only the displacement component along the LoS direction, an accurate alignment of the system with respect to the moving direction, allowed us to assess almost completely the motion of the landslide. The landslide, never detected before, occurred on the 30th of January; at 8.00 PM of the same day the Civil Protection Department entrusted the monitoring of the unstable slope to the Earth Science Department - University of Firenze. On the 31st of January a GB-InSAR system was installed (by Ellegi-Lisalab s.r.l.) and, after the test, carried out on the 1st of February, just 48 hours after the occurrence of the landslide, the monitoring campaign started. On the 2nd of February, thanks to GB-InSAR data interpretation, the A3 motorway, previously inhibited to vehicular traffic, was already partially re-opened. The opening of the A3 motorway was particularly significant considering that the by-pass constituted by the state highway SS18 and other 28 country roads in the neighbour area were inhibited due to rainfall. The campaign lasted until the 24th of April when the alarm ceased definitely. The brief chronicle and the analysis of the data acquired during this period described in this contribution highlights the potentiality of this system during emergency.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005OptLT..37..478L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005OptLT..37..478L"><span id="translatedtitle">Study on cross-section clad profile in coaxial <span class="hlt">single-pass</span> cladding with a low-power laser</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Jichang; Li, Lijun</p> <p>2005-09-01</p> <p>In this paper, a model of cross-section clad profile on the substrate in coaxial <span class="hlt">single-pass</span> cladding with a low-power laser was studied. The static model of powder mass concentration distribution at cold-stream conditions was defined as a Gaussian function. In coaxial <span class="hlt">single-pass</span> cladding with a low-power laser, since the influence of surface tension, gravity and gas flow on the clad bead could be neglected, the cross-section profile of the clad bead deposited by a low-power laser on the substrate was dominated by the powder concentration at each point on the pool and the time when the material was liquid at this point. The height of each point on the cross-section clad profile was defined as a definite integration of a Gaussian function from the moment at which the melt pool was just arriving at the point to the moment at which the point left the melt pool. In the presented experiment, powder of Steel 63 (at 0.63 wt% C) was deposited on a substrate of Steel 20 (at 0.20 wt% C) at the laser power of 135 W. The experimental results testified the model.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110024195','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110024195"><span id="translatedtitle">Michelson <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Rogers, Ryan</p> <p>2007-01-01</p> <p>The Michelson <span class="hlt">Interferometer</span> is a device used in many applications, but here it was used to measure small differences in distance, in the milli-inch range, specifically for defects in the Orbiter windows. In this paper, the method of using the Michelson <span class="hlt">Interferometer</span> for measuring small distances is explained as well as the mathematics of the system. The coherence length of several light sources was calculated in order to see just how small a defect could be measured. Since white light is a very broadband source, its coherence length is very short and thus can be used to measure small defects in glass. After finding the front and back reflections from a very thin glass slide with ease and calculating the thickness of it very accurately, it was concluded that this system could find and measure small defects on the Orbiter windows. This report also discusses a failed attempt for another use of this technology as well as describes an area of promise for further analysis. The latter of these areas has applications for finding possible defects in Orbiter windows without moving parts.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li class="active"><span>3</span></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_3 --> <div id="page_4" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="61"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/878377','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/878377"><span id="translatedtitle">Lucretia: A Matlab-Based Toolbox for the Modellingand Simulation of <span class="hlt">Single-Pass</span> Electron Beam Transport Systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Tenenbaum, P.; /SLAC</p> <p>2005-09-30</p> <p>We report on Lucretia, a new simulation tool for the study of <span class="hlt">single-pass</span> electron beam transport systems. Lucretia supports a combination of analytic and tracking techniques to model the tuning and operation of bunch compressors, linear accelerators, and beam delivery systems of linear colliders and linac-driven Free Electron Laser (FEL) facilities. Extensive use of Matlab scripting, graphics, and numerical capabilities maximize the flexibility of the system, and emphasis has been placed on representing and preserving the fixed relationships between elements (common girders, power supplies, etc.) which must be respected in the design of tuning algorithms. An overview of the code organization, some simple examples, and plans for future development are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009AGUFMIN31C1015M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009AGUFMIN31C1015M"><span id="translatedtitle">The Glacier and Land Ice Surface Topography <span class="hlt">Interferometer</span>: An Airborne Proof-of-concept Mapping Sensor</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Moller, D.; Hensley, S.; Chuang, C.; Fisher, C.; Muellerschoen, R.; Milligan, L.; Sadowy, G.; Rignot, E. J.</p> <p>2009-12-01</p> <p>In May 2009 a new <span class="hlt">radar</span> technique for mapping ice surface topography was demonstrated in a Greenland campaign as part of the NASA International Polar Year activities. This was achieved by integrating a Ka-band <span class="hlt">single-pass</span> interferometric synthetic <span class="hlt">radar</span> on the NASA Dryden Gulfstream III for a coordinated deployment. Although the technique of using <span class="hlt">radar</span> interferometry for mapping terrain has been demonstrated before, this is the first such application at millimeter-wave frequencies. This proof-of-concept demonstration was motivated by the Glacier and Land Ice Surface Topography <span class="hlt">Interferometer</span> (GLISTIN) Instrument Incubator Program and furthermore, highly leveraged existing ESTO hardware and software assets (the Unmanned Airborne Vehicle Synthetic Aperture <span class="hlt">Radar</span> (UAVSAR) and processor and the PR2 (precipitation <span class="hlt">radar</span> 2) RF assembly and power amplifier). Initial Ka-band test flights occurred in March and April of 2009 followed by the Greenland deployment. Instrument performance indicates swath widths over the ice between 5-7km, with height precisions ranging from 30cm-3m at a posting of 3m x 3m. However, for this application the electromagnetic wave will penetrate an unknown amount into the snow cover thus producing an effective bias that must be calibrated. This penetration will be characterized as part of this program and is expected to vary as a function of snow wetness and <span class="hlt">radar</span> incidence angle. To evaluate this, we flew a coordinated collection with the NASA Wallops Airborne Topographic Mapper on a transect from Greenland’s Summit its West coast. This flight included two field calibration sites at Colorado Institute for Research in Environmental Science’s Swiss Camp and the National Science Foundation’s Summit station. Additional collections entailed flying a grid over Jakobshavn glacier which were repeated after 6 days to reveal surface dynamics. In this time frame we were able to observe horizontal motion of over 1km on the glacier. While developed for relevancy to ice surface mapping, the Ka-band <span class="hlt">interferometer</span> was able to make targeted observations relevant for the Surface Water and Ocean Topography (SWOT) mission. Most notably, en route to Greenland via North Dakota, data was collected in the “SWOT-like” geometry by rolling the GIII toward nadir and collecting nadir data over surface water targets (Red and Missouri Rivers, Devils Lake, ND and the Big Bog, MN). Flying into Thule, SWOT data was also collected over sea ice. In summary, the campaign and demonstration was highly successful. Not only were we able to achieve the primary objective of validated data collections for ice-surface topography, but we also gathered unique observations that will be used by the SWOT mission. In the next year, the detailed processing, absolute calibration and intersensor comparisons will enable us ultimately to produce a high quality topographic map of Jakobshavn as an IPY reference for measuring future changes in ice elevation. Finally, our experiment has paved the way to make more topographic products available to glaciologists, either through dedicated airborne campaigns, or ultimately as a satellite mission.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/95293','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/95293"><span id="translatedtitle">Merits of a sub-harmonic approach to a <span class="hlt">single-pass</span>, 1.5-{Angstrom} FEL</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Fawley, W.M.; Nuhn, H.D.; Bonifacio, R.; Scharlemann, E.T.</p> <p>1995-03-01</p> <p>SLAC/SSRL and collaborators elsewhere are studying th physics of a <span class="hlt">single-pass</span>, FEL amplifier operating in th 1 -- 2 {Angstrom}, wavelength region based on electron beams from the SLAC linac at {approximately} 15 GeV energy. Hoping to reduce the total wiggler length needed to reach saturation when starting from shot noise, we have examined the benefits of making the first part of the wiggler resonant at a subharmonic wavelength (e.g. 4.5 {Angstrom}) at which the gain length can be significantly shorter. This leads to bunching of the electron beam at both the subharmonic and fundaments wavelengths, thus providing a strong coherent ``seed`` for exponential growth of radiation at the fundamental in the second part of the wiggler. Using both multi-harmonic and multi-frequency 2D FEL simulation codes, we have examined the predicted performance of such devices and the sensitivity to electron beam parameters such as current, emittance, and instantaneous energy spread.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/896420','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/896420"><span id="translatedtitle">Development of a 2D Vlasov Solver for Longitudinal BeamDynamics in <span class="hlt">Single-Pass</span> Systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Venturini, M.; Warnock, R.; Zholents, A.; /SLAC</p> <p>2006-12-12</p> <p>Direct numerical methods for solving the Vlasov equation offer some advantages over macroparticle simulations, as they do not suffer from the numerical noise inherent in using a number of macroparticles smaller than the bunch population. Unfortunately these methods are more time-consuming and generally considered impractical in a full 6D phase space. However, in a lower-dimension phase space they may become attractive if the beam dynamics is sensitive to the presence of small charge-density fluctuations and a high resolution is needed. In this paper we present a 2D Vlasov solver for studying the longitudinal beam dynamics in <span class="hlt">single-pass</span> systems of interest for X-FEL's, where characterization of the microbunching instability is of particular relevance. The solver includes a model to account for the smearing effect of a finite horizontal emittance on microbunching. We explore the effect of space charge and coherent synchrotron radiation (CSR). The numerical solutions are compared with results from linear theory and good agreement is found in the regime where linear theory applies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21091350','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21091350"><span id="translatedtitle"><span class="hlt">Single-Pass</span> Percutaneous Liver Biopsy for Diffuse Liver Disease Using an Automated Device: Experience in 154 Procedures</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rivera-Sanfeliz, Gerant Kinney, Thomas B.; Rose, Steven C.; Agha, Ayad K.M.; Valji, Karim; Miller, Franklin J.; Roberts, Anne C.</p> <p>2005-06-15</p> <p>Purpose: To describe our experience with ultrasound (US)-guided percutaneous liver biopsies using the INRAD 18G Express core needle biopsy system.Methods: One hundred and fifty-four consecutive percutaneous core liver biopsy procedures were performed in 153 men in a single institution over 37 months. The medical charts, pathology reports, and radiology files were retrospectively reviewed. The number of needle passes, type of guidance, change in hematocrit level, and adequacy of specimens for histologic analysis were evaluated.Results: All biopsies were performed for histologic staging of chronic liver diseases. The majority of patients had hepatitis C (134/153, 90.2%). All patients were discharged to home after 4 hr of postprocedural observation. In 145 of 154 (94%) biopsies, a single needle pass was sufficient for diagnosis. US guidance was utilized in all but one of the procedures (153/154, 99.4%). The mean hematocrit decrease was 1.2% (44.1-42.9%). Pain requiring narcotic analgesia, the most frequent complication, occurred in 28 of 154 procedures (18.2%). No major complications occurred. The specimens were diagnostic in 152 of 154 procedures (98.7%).Conclusions: <span class="hlt">Single-pass</span> percutaneous US-guided liver biopsy with the INRAD 18G Express core needle biopsy system is safe and provides definitive pathologic diagnosis of chronic liver disease. It can be performed on an outpatient basis. Routine post-biopsy monitoring of hematocrit level in stable, asymptomatic patients is probably not warranted.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ag.montana.edu/narc/docs/Agronomy/01NARC-MWB3_AirDrillOpnrs.pdf','EPRINT'); return false;" href="http://ag.montana.edu/narc/docs/Agronomy/01NARC-MWB3_AirDrillOpnrs.pdf"><span id="translatedtitle">PROJECT TITLE: Evaluation of Seed Boot and Furrow Opener Configurations for Optimizing Seed and Fertilizer Placement in Simultaneous, <span class="hlt">Single-Pass</span> Operations with Air Drills under</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Maxwell, Bruce D.</p> <p></p> <p>Seed and Fertilizer Placement in Simultaneous, <span class="hlt">Single-Pass</span> Operations with Air Drills under Differing-shoot" opener configurations under dryland chemical fallow conditions with `Scholar' spring wheat direct with openers, producers prefer to limit their on-farm inventory to one or perhaps two differing scenarios</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/15001823','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/15001823"><span id="translatedtitle">Dissolution Kinetics of Titanium Pyrochlore Ceramics at 90?C by <span class="hlt">Single-Pass</span> Flow-Through Experiments</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Icenhower, Jonathan P.; McGrail, B. Peter; Schaef, Herbert T.; Cordova, Elsa A.</p> <p>2000-12-01</p> <p>Corrosion resistances of titanium-based ceramics are quantified using <span class="hlt">single-pass</span> flow-through (SPFT) experiments. The materials tested include simple pyrochlore group (B2Ti2O7, where B=Lu^3+ or Gd^3+) and complex multiphase materials that are either pyrochlore- (PY12) or zirconolite-dominated (BSL3). Experiments are conducted at 90?C over a range of pH-buffered conditions with typical duration of experiments in excess of 120 days. Apparent steady-state dissolution rates at pH=2 determined on the Gd2Ti2O7 and Lu2Ti2O7 samples indicate congruent dissolution, with rates of the former (1.3x10^-3 to 4.3x10^-3) slightly faster than the latter (4.4x10^-4 to 7.0x10^-4 g m^-2 d^-1). Rates for PY12 materials into pH=2 solutions are 5.9x10^-5 to 8.6x10^-5 g m^-2 d^-1. In contrast, experiments with BSL3 material do not reach steady-state conditions, and appear to undergo rapid physical and chemical corrosion into solution. At faster flow-through rates, dissolution rates display a shallow amphoteric behavior, with a minimum (4.6x10^-5 to 5.8x10^-5 g m^-2 d^-1) near pH values of 7. Dissolution rates display a measurable increase (~10X) with increasing flow-through rate indicating the strong influence that chemical affinity asserts on the system. These results step towards an evaluation of the corrosion mechanism and an evaluation of the long-term performance of Pu-bearing titanite engineered materials in the subsurface.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015OptLT..67...93K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015OptLT..67...93K"><span id="translatedtitle">An efficient continuous-wave and Q-switched <span class="hlt">single-pass</span> two-stage Ho:YLF MOPA system</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kwiatkowski, Jacek; Jabczynski, Jan Karol; Zendzian, Waldemar</p> <p>2015-04-01</p> <p>We report on the efficient operation of an Ho:YLF laser <span class="hlt">single-pass</span> in-band pumped by a Tm-doped fiber laser. The research in a continuous-wave (CW) operation in an oscillator scheme was done for a crystal of 0.5 at% Ho dopant concentration and the length of 30 mm for the output coupler transmittances of TOC=10%, 20%, 30% and 40%. At room temperature, for the output coupling transmission of 20%, the maximum CW output power of 24.5 W for 82.5 W of incident pump power, corresponding to the slope efficiency of 35.4% and optical-to-optical conversion efficiency of 29.7% was achieved. The highest slope efficiency of 81.6% with respect to absorbed pump power was obtained. Carrying out the measurements of the laser spectrum, for the out-coupling transmittance of TOC=30%, we observed a very short time wavelength shift between 2051.5 and 2062.4 nm in an Ho:YLF laser operation. Trying to fully utilize the pump power unabsorbed by the active crystal in an oscillator stage, an amplifier system based on two additional Ho:YLF crystals was developed. For the output coupling transmission of 40% the slope efficiency increased from 31.5% in an oscillator scheme to 47.3% with respect to the incident pump power in a two-stage amplifier scheme with a beam quality parameter of M2 better than 1.1. For a Q-switched operation, for the maximum incident pump power and the pulse repetition frequency (PRF) of 1 kHz, pulse energies of 18.5 mJ with a 22 ns FWHM pulse width corresponding to 841 kW peak power in the amplifier system were recorded.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007AGUFMIN23B..03M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007AGUFMIN23B..03M"><span id="translatedtitle">The Glacier and Ice Sheet Topography <span class="hlt">Interferometer</span>: An Update on a Unique Sensor for High Accuracy Swath Mapping of Land Ice</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Moller, D.; Heavey, B.; Hensley, S.; Hodges, R.; Rengarajan, S.; Rignot, E.; Sadowy, G.; Simard, M.; Zawadzki, M.</p> <p>2007-12-01</p> <p>We discuss the innovative concept and technology development of a Ka-band (35 GHz) <span class="hlt">radar</span> for mapping the surface topography of glaciers and ice sheets. The "Glacier and Land Ice Surface Topography <span class="hlt">Interferometer</span>" (GLISTIN) is a <span class="hlt">single-pass</span>, single platform interferometric synthetic aperture <span class="hlt">radar</span> (InSAR) with an 8mm wavelength, which minimizes snow penetration yet remains relatively impervious to atmospheric attenuation. Such a system has the potential for delivering topographic maps at high spatial resolution, high vertical accuracy, independent of cloud cover, with a subseasonal update and would greatly enhance current observational and modeling capabilities of ice mass-balance and glacial retreat. To enable such measurements, a digitally beamformed antenna array is utilized to provide a wide measurement swath at a technologically feasible transmit power. To prove this concept and advance the technology readiness of this design we are currently funded by the NASA Earth Science Technology Office (ESTO) Instrument Incubator Program (IIP) to build and test a 1m x 1m digitally-beamformed (DBF) Ka-band slotted waveguide antenna with integrated digital receivers. This antenna provides 16 simultaneous receive beams, effectively broadening the swath without reducing receive antenna gain. The implementation of such a large aperture at Ka-band presents many design, manufacturing and calibration challenges which are addressed as part of this IIP. The integrated DBF array will be fielded at the Jet Propulsion Laboratory's antenna range to demonstrate the overall calibration, beamforming and interferometric performance through creation of topographic imagery of the local Arroyo Seco. Currently entering the third year of the program, we will overview the system concept, array implementation and status of the technology. While the IIP addresses the development of the major technology challenges, an additional effort will demonstrate the phenomenology of the measurement by adapting the NASA ESTO-funded Uninhabited Aerial Vehicle - Synthetic Aperture <span class="hlt">Radar</span> (UAVSAR) system for Ka-band <span class="hlt">single-pass</span> interferometry. The conversion to Ka-Band will utilize the modular UAVSAR system originally designed for L-Band operation, retaining the <span class="hlt">radar</span> control, data acquisition and processing infrastructure and requiring only minor pod and RF modifications. We will fly the Ka-Band <span class="hlt">interferometer</span> aboard the UAVSAR platform over regions of Greenland, flying a grid over Jakobshavn glacier, then a transect from the coast to Swiss Camp ending at Greenland's Summit. Over a period of 4-5 weeks at the beginning of the melt season, these flight missions will be repeated in different snow/ice conditions. The flight data will be compared with airborne laser altimetry (Airborne Topographic Mapper lidar instrument, NASA GSFC/Wallops), field observations (GPS data at Swiss Camp, Summit), and climate data from the Automatic Weather Station (Colorado University) network (snowfall, corrected for densification) to estimate penetration and produce topographic surface maps. Topography is an essential piece of information for glaciology and a high-quality topographic map (tens of cm height accuracy over 10m pixels) will be produced. The experiment will pave the way to making more topographic products available to glaciologists and aid in the design a spaceborne mission capable of delivering similar products at the continental scale.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19880054697&hterms=special+relativity&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dspecial%2Brelativity','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19880054697&hterms=special+relativity&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dspecial%2Brelativity"><span id="translatedtitle">Special relativity and <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Han, D.; Kim, Y. S.</p> <p>1988-01-01</p> <p>A new generation of gravitational wave detectors is expected to be based on <span class="hlt">interferometers</span>. Yurke et al. (1986) introduced a class of <span class="hlt">interferometers</span> characterized by SU(1,1) which can in principle achieve a phase sensitivity approaching 1/N, where N is thte total number of photons entering the <span class="hlt">interferometer</span>. It is shown here that the SU(1,1) <span class="hlt">interferometer</span> can serve as an analog computer for Wigner's little group of the Poincare\\'| group.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1998SPIE.3411..236K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998SPIE.3411..236K"><span id="translatedtitle">Optimization of multichannel <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Koudryashov, Youri Y.; Morzhakov, Alexander A.</p> <p>1998-06-01</p> <p>The choice of D-optimal planning is recommended for processing of multi-channel <span class="hlt">interferometer</span> data. The estimate of potential accuracy of <span class="hlt">interferometer</span> measurements is obtained. Relationship for mutual estimate accuracy is provided for D-optimal planning. Design recommendations for multi-channel <span class="hlt">interferometer</span> are proposed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6612423','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6612423"><span id="translatedtitle">A <span class="hlt">single-pass</span> free-electron laser for soft x-rays with wavelengths less than or equal to 10 nm</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Goldstein, J.C.; Wang, T.F.; Newnam, B.E.; McVey, B.D.</p> <p>1987-01-01</p> <p>We consider a <span class="hlt">single-pass</span> FEL amplifier, driven by an rf-linac followed by a damping ring for reduced emittance, for use in generating intense coherent light at wavelengths <10 nm. The dependence of the optical gain on electron beam quality, studied with the 3-D FEL simulation code FELEX, is given and related to the expected power of self-amplified spontaneous emission. Design issues for the damping ring to achieve the required electron beam quality are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/872426','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/872426"><span id="translatedtitle">Phase shifting <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sommargren, Gary E. (Santa Cruz, CA)</p> <p>1999-01-01</p> <p>An <span class="hlt">interferometer</span> which has the capability of measuring optical elements and systems with an accuracy of .lambda./1000 where .lambda. is the wavelength of visible light. Whereas current <span class="hlt">interferometers</span> employ a reference surface, which inherently limits the accuracy of the measurement to about .lambda./50, this <span class="hlt">interferometer</span> uses an essentially perfect spherical reference wavefront generated by the fundamental process of diffraction. Whereas current <span class="hlt">interferometers</span> illuminate the optic to be tested with an aberrated wavefront which also limits the accuracy of the measurement, this <span class="hlt">interferometer</span> uses an essentially perfect spherical measurement wavefront generated by the fundamental process of diffraction. This <span class="hlt">interferometer</span> is adjustable to give unity fringe visibility, which maximizes the signal-to-noise, and has the means to introduce a controlled prescribed relative phase shift between the reference wavefront and the wavefront from the optics under test, which permits analysis of the interference fringe pattern using standard phase extraction algorithms.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/678613','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/678613"><span id="translatedtitle">Phase shifting <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sommargren, G.E.</p> <p>1999-08-03</p> <p>An <span class="hlt">interferometer</span> is disclosed which has the capability of measuring optical elements and systems with an accuracy of {lambda}/1000 where {lambda} is the wavelength of visible light. Whereas current <span class="hlt">interferometers</span> employ a reference surface, which inherently limits the accuracy of the measurement to about {lambda}/50, this <span class="hlt">interferometer</span> uses an essentially perfect spherical reference wavefront generated by the fundamental process of diffraction. Whereas current <span class="hlt">interferometers</span> illuminate the optic to be tested with an aberrated wavefront which also limits the accuracy of the measurement, this <span class="hlt">interferometer</span> uses an essentially perfect spherical measurement wavefront generated by the fundamental process of diffraction. This <span class="hlt">interferometer</span> is adjustable to give unity fringe visibility, which maximizes the signal-to-noise, and has the means to introduce a controlled prescribed relative phase shift between the reference wavefront and the wavefront from the optics under test, which permits analysis of the interference fringe pattern using standard phase extraction algorithms. 11 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20974678','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20974678"><span id="translatedtitle">Fidelity of quantum <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bahder, Thomas B.; Lopata, Paul A.</p> <p>2006-11-15</p> <p>For a generic <span class="hlt">interferometer</span>, the conditional probability density distribution p({phi}|m), for the phase {phi} given measurement outcome m will generally have multiple peaks. Therefore, the phase sensitivity of an <span class="hlt">interferometer</span> cannot be adequately characterized by the standard deviation, such as {delta}{phi}{approx}1/{radical}(N) (the standard limit), or {delta}{phi}{approx}1/N (the Heisenberg limit). We propose an alternative measure of phase sensitivity--the fidelity of an <span class="hlt">interferometer</span>--defined as the Shannon mutual information between the phase shift {phi} and the measurement outcomes m. As an example application of <span class="hlt">interferometer</span> fidelity, we consider a generic optical Mach-Zehnder <span class="hlt">interferometer</span>, used as a sensor of a classical field. For the case where there exists no a priori information on the phase shift, we find the surprising result that maximally entangled state input leads to a lower fidelity than Fock state input, for the same photon number.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1991ctnd.rept..199M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1991ctnd.rept..199M"><span id="translatedtitle">Sensitive <span class="hlt">radars</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Meer, David E.</p> <p></p> <p>Prospective sensitive <span class="hlt">radar</span> technologies with sensors operating at both RF and laser frequencies will enhance target detection, localization, classification, identification, and tracking capabilities. Ultrawideband <span class="hlt">radars</span> operating at lower frequencies promise to detect stealthy targets and furnish simpler, lower cost, more reliable <span class="hlt">radars</span> which can perform many of the functions of current high resolution <span class="hlt">radars</span>. High resolution RF sensors for real-time recognition of noncooperative targets will be critical in future engagements, allowing detection of targets hidden in folliage. Laser <span class="hlt">radar</span> technology will have its greatest impact in cruise missile and robotic vehicle navigation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1990radr.conf..585H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1990radr.conf..585H"><span id="translatedtitle"><span class="hlt">Radar</span> vision</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haykin, Simon</p> <p></p> <p>The novel idea called <span class="hlt">radar</span> vision is introduced. The goal of <span class="hlt">radar</span> vision is to make <span class="hlt">radar</span> into an intelligent remote-sensing device that is capable of cognition of the surrounding environment. The attributes of <span class="hlt">radar</span> as an electromagnetic sensor are reviewed, and the possibility of <span class="hlt">radar</span> learning from the environment is discussed. The issues of time and knowledge processing and the incorporation of feedback are addressed. The facilities in place at McMaster University for research into the development and perfection of a <span class="hlt">radar</span> vision system are described. The IPIX <span class="hlt">radar</span> and the systolic-based computing machinery, which play critical and complementary roles, are described. The IPIX <span class="hlt">radar</span> permits the collection and invaluable real-life data on the ocean environment and <span class="hlt">radar</span> targets of interest under varying conditions. The systolic-<span class="hlt">radar</span> computing machinery processes this database in near real time and computes the neural-network-based algorithms that are designed to perform the different functions of <span class="hlt">radar</span> vision.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5647638','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5647638"><span id="translatedtitle">Condor equatorial electrojet campaign: <span class="hlt">Radar</span> results</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kudeki, E.; Fejer, B.G.; Farley, D.T.; Hanuise, C.</p> <p>1987-12-01</p> <p>A review of the experimental and theoretical background to the Condor equatorial electrojet compaign is followed by the presentation and discussion of VHF <span class="hlt">radar</span> <span class="hlt">interferometer</span> and HF <span class="hlt">radar</span> backscatter data taken concurrently with two rocket in situ experiments reported in companion papers (Pfaff et al., this issue (a, b). Both experiments were conducted in strongly driven periods with the on-line <span class="hlt">radar</span> <span class="hlt">interferometer</span> displaying signatures of what has been interpreted in earlier <span class="hlt">radar</span> work (Kudeki et al., 1982) as kilometer scale gradient drift waves. Low-frequency density fluctuations detected by in situ rocket sensors confirm the earlier interpretation. VHF <span class="hlt">radar</span>/rocket data comparisons also indicate the existence of a turbulent layer in the upper portion of the daytime electrojet at about 108 km altitude driven purely by the two-stream instability. Nonlinear mode coupling of linearly growing two-stream waves to linearly damped 3-m vertical modes could account for the <span class="hlt">radar</span> echoes scattered from this layer, which showed no indication of large-scale gradient drift waves. Nonlinear mode coupling may therefore compete with the wave-induced anomalous diffusion mechanism proposed recently by Sudan (1983) for the saturation of directly excited two-stream waves. Nighttime <span class="hlt">radar</span> data show a bifurcated layer with the two parts having comparable echo strength but oppositely directed zonal drift velocities. The lower layer shows narrow backscatter spectra; the upper layer is characterized by kilometer scale waves and vertically propagating type 1 waves.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/870577','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/870577"><span id="translatedtitle">Phase shifting diffraction <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sommargren, Gary E. (Santa Cruz, CA)</p> <p>1996-01-01</p> <p>An <span class="hlt">interferometer</span> which has the capability of measuring optical elements and systems with an accuracy of .lambda./1000 where .lambda. is the wavelength of visible light. Whereas current <span class="hlt">interferometers</span> employ a reference surface, which inherently limits the accuracy of the measurement to about .lambda./50, this <span class="hlt">interferometer</span> uses an essentially perfect spherical reference wavefront generated by the fundamental process of diffraction. This <span class="hlt">interferometer</span> is adjustable to give unity fringe visibility, which maximizes the signal-to-noise, and has the means to introduce a controlled prescribed relative phase shift between the reference wavefront and the wavefront from the optics under test, which permits analysis of the interference fringe pattern using standard phase extraction algorithms.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20010088374','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20010088374"><span id="translatedtitle">The Palomar Testbed <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Colavita, M. M.; Wallace, J. K.; Hines, B. E.; Gursel, Y.; Malbet, F.; Palmer, D. L.; Pan, X. P.; Shao, M.; Yu, J. W.; Boden, A. F.</p> <p>1999-01-01</p> <p>The Palomar Testbed <span class="hlt">Interferometer</span> (PTI) is a long-baseline infrared <span class="hlt">interferometer</span> located at Palomar Observatory, California. It was built as a testbed for interferometric techniques applicable to the Keck <span class="hlt">Interferometer</span>. First fringes were obtained in 1995 July. PTI implements a dual-star architecture, tracking two stars simultaneously for phase referencing and narrow-angle astrometry. The three fixed 40 cm apertures can be combined pairwise to provide baselines to 110 m. The <span class="hlt">interferometer</span> actively tracks the white-light fringe using an array detector at 2.2 microns and active delay lines with a range of +/-38 m. Laser metrology of the delay lines allows for servo control, and laser metrology of the complete optical path enables narrow-angle astrometric measurements. The instrument is highly automated, using a multiprocessing computer system for instrument control and sequencing.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_4 --> <div id="page_5" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="81"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/6086986','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/6086986"><span id="translatedtitle">Dual surface <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Pardue, R.M.; Williams, R.R.</p> <p>1980-09-12</p> <p>A double-pass <span class="hlt">interferometer</span> is provided which allows direct measurement of relative displacement between opposed surfaces. A conventional plane mirror <span class="hlt">interferometer</span> may be modified by replacing the beam-measuring path cube-corner reflector with an additional quarterwave plate. The beam path is altered to extend to an opposed plane mirrored surface and the reflected beam is placed in interference with a retained reference beam split from dual-beam source and retroreflected by a reference cube-corner reflector mounted stationary with the <span class="hlt">interferometer</span> housing. This permits direct measurement of opposed mirror surfaces by laser interferometry while doubling the resolution as with a conventional double-pass plane mirror laser <span class="hlt">interferometer</span> system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/372585','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/372585"><span id="translatedtitle">Phase shifting diffraction <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Sommargren, G.E.</p> <p>1996-08-29</p> <p>An <span class="hlt">interferometer</span> which has the capability of measuring optical elements and systems with an accuracy of {lambda}/1000 where {lambda} is the wavelength of visible light. Whereas current <span class="hlt">interferometers</span> employ a reference surface, which inherently limits the accuracy of the measurement to about {lambda}/50, this <span class="hlt">interferometer</span> uses an essentially perfect spherical reference wavefront generated by the fundamental process of diffraction. This <span class="hlt">interferometer</span> is adjustable to give unity fringe visibility, which maximizes the signal-to-noise, and has the means to introduce a controlled prescribed relative phase shift between the reference wavefront and the wavefront from the optics under test, which permits analysis of the interference fringe pattern using standard phase extraction algorithms. 8 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20070019850&hterms=incubator&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dincubator','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20070019850&hterms=incubator&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dincubator"><span id="translatedtitle">The Glacier and Land Ice Surface Topography <span class="hlt">Interferometer</span> (GLISTIN): A Novel Ka-band Digitally Beamformed <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Moller, Delwyn K.; Heavey, Brandon; Hodges, Richard; Rengarajan, Sembiam; Rignot, Eric; Rogez, Francois; Sadowy, Gregory; Simard, Marc; Zawadzki, Mark</p> <p>2006-01-01</p> <p>The estimation of the mass balance of ice sheets and glaciers on Earth is a problem of considerable scientific and societal importance. A key measurement to understanding, monitoring and forecasting these changes is ice-surface topography, both for ice-sheet and glacial regions. As such NASA identified 'ice topographic mapping instruments capable of providing precise elevation and detailed imagery data for measurements on glacial scales for detailed monitoring of ice sheet, and glacier changes' as a science priority for the most recent Instrument Incubator Program (IIP) opportunities. Funded under this opportunity is the technological development for a Ka-Band (35GHz) <span class="hlt">single-pass</span> digitally beamformed interferometric synthetic aperture <span class="hlt">radar</span> (InSAR). Unique to this concept is the ability to map a significant swath impervious of cloud cover with measurement accuracies comparable to laser altimeters but with variable resolution as appropriate to the differing scales-of-interest over ice-sheets and glaciers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6969296','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6969296"><span id="translatedtitle">Evaluation of a potential generator-produced PET tracer for cerebral perfusion imaging: <span class="hlt">Single-pass</span> cerebral extraction measurements and imaging with radiolabeled Cu-PTSM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mathias, C.J.; Welch, M.J.; Raichle, M.E.; Mintun, M.A.; Lich, L.L.; McGuire, A.H.; Zinn, K.R.; John, E.K.; Green, M.A. )</p> <p>1990-03-01</p> <p>Copper(II) pyruvaldehyde bis(N4-methylthiosemicarbazone) (Cu-PTSM), copper(II) pyruvaldehyde bis(N4-dimethylthiosemicarbazone) (Cu-PTSM2), and copper(II) ethylglyoxal bis(N4-methylthiosemicarbazone) (Cu-ETSM), have been proposed as PET tracers for cerebral blood flow (CBF) when labeled with generator-produced 62Cu (t1/2 = 9.7 min). To evaluate the potential of Cu-PTSM for CBF PET studies, baboon <span class="hlt">single-pass</span> cerebral extraction measurements and PET imaging were carried out with the use of 67Cu (t1/2 = 2.6 days) and 64Cu (t1/2 = 12.7 hr), respectively. All three chelates were extracted into the brain with high efficiency. There was some clearance of all chelates in the 10-50-sec time frame and Cu-PTSM2 continued to clear. Cu-PTSM and Cu-ETSM have high residual brain activity. PET imaging of baboon brain was carried out with the use of (64Cu)-Cu-PTSM. For comparison with the 64Cu brain image, a CBF (15O-labeled water) image (40 sec) was first obtained. Qualitatively, the H2(15)O and (64Cu)-Cu-PTSM images were very similar; for example, a comparison of gray to white matter uptake resulted in ratios of 2.42 for H2(15)O and 2.67 for Cu-PTSM. No redistribution of 64Cu was observed in 2 hr of imaging, as was predicted from the <span class="hlt">single-pass</span> study results. Quantitative determination of blood flow using Cu-PTSM showed good agreement with blood flow determined with H2(15)O. This data suggests that (62Cu)-Cu-PTSM may be a useful generator-produced radiopharmaceutical for blood flow studies with PET.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20100036546','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20100036546"><span id="translatedtitle">Heterodyne <span class="hlt">Interferometer</span> Angle Metrology</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hahn, Inseob; Weilert, Mark A.; Wang, Xu; Goullioud, Renaud</p> <p>2010-01-01</p> <p>A compact, high-resolution angle measurement instrument has been developed that is based on a heterodyne <span class="hlt">interferometer</span>. The common-path heterodyne <span class="hlt">interferometer</span> metrology is used to measure displacements of a reflective target surface. In the <span class="hlt">interferometer</span> setup, an optical mask is used to sample the measurement laser beam reflecting back from a target surface. Angular rotations, around two orthogonal axes in a plane perpendicular to the measurement- beam propagation direction, are determined simultaneously from the relative displacement measurement of the target surface. The device is used in a tracking telescope system where pitch and yaw measurements of a flat mirror were simultaneously performed with a sensitivity of 0.1 nrad, per second, and a measuring range of 0.15 mrad at a working distance of an order of a meter. The nonlinearity of the device is also measured less than one percent over the measurement range.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19830017004&hterms=Cherry&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3DCherry','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19830017004&hterms=Cherry&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3DCherry"><span id="translatedtitle">Spaceborne <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Moore, R. K.; Eckerman, J.; Meneghini, R.; Atlas, D.; Boerner, W. M.; Cherry, S.; Clark, J. F.; Doviak, R. J.; Goldhirsh, J.; Lhermitte, R. M.</p> <p>1981-01-01</p> <p>The spaceborne <span class="hlt">radar</span> panel considered how <span class="hlt">radar</span> could be used to measure precipitation from satellites. The emphasis was on how <span class="hlt">radar</span> could be used with radiometry (at microwave, visible (VIS), and infrared (IR) wavelengths) to reduce the uncertainties of measuring precipitation with radiometry alone. In addition, the fundamental electromagnetic interactions involved in the measurements were discussed to determine the key work areas for research and development to produce effective instruments. Various approaches to implementing <span class="hlt">radar</span> systems on satellites were considered for both shared and dedicated instruments. Finally, a research and development strategy was proposed for establishing the parametric relations and retrieval algorithms required for extracting precipitation information from the <span class="hlt">radar</span> and associated radiometric data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19710000323','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19710000323"><span id="translatedtitle">Multispectral infrared imaging <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Potter, A. E., Jr.</p> <p>1971-01-01</p> <p>Device permitting simultaneous viewing of infrared images at different wavelengths consists of imaging lens, Michelson <span class="hlt">interferometer</span>, array of infrared detectors, data processing equipment for Fourier transformation of detector signal, and image display unit. Invention is useful in earth resources applications, nondestructive testing, and medical diagnoses.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0812.4566v1','EPRINT'); return false;" href="http://arxiv.org/pdf/0812.4566v1"><span id="translatedtitle">An electron Talbot <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Benjamin J. McMorran; Alexander D. Cronin</p> <p>2008-12-24</p> <p>The Talbot effect, in which a wave imprinted with transverse periodicity reconstructs itself at regular intervals, is a diffraction phenomenon that occurs in many physical systems. Here we present the first observation of the Talbot effect for electron de Broglie waves behind a nanofabricated transmission grating. This was thought to be difficult because of Coulomb interactions between electrons and nanostructure gratings, yet we were able to map out the entire near-field interference pattern, the "Talbot carpet", behind a grating. We did this using a Talbot <span class="hlt">interferometer</span>, in which Talbot interference fringes from one grating are moire'-filtered by a 2nd grating. This arrangement has served for optical, X-ray, and atom interferometry, but never before for electrons. Talbot <span class="hlt">interferometers</span> are particularly sensitive to distortions of the incident wavefronts, and to illustrate this we used our Talbot <span class="hlt">interferometer</span> to measure the wavefront curvature of a weakly focused electron beam. Here we report how this wavefront curvature demagnified the Talbot revivals, and we discuss applications for electron Talbot <span class="hlt">interferometers</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=optics&pg=7&id=EJ891979','ERIC'); return false;" href="http://eric.ed.gov/?q=optics&pg=7&id=EJ891979"><span id="translatedtitle">Ultrasonic <span class="hlt">Interferometers</span> Revisited</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Greenslade, Thomas B., Jr.</p> <p>2007-01-01</p> <p>I have been tinkering with ultrasonic transducers once more. In earlier notes I reported on optics-like experiments performed with ultrasonics, described a number of ultrasonic <span class="hlt">interferometers</span>, and showed how ultrasonic transducers can be used for Fourier analysis. This time I became interested in trying the technique of using two detectors in…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1064567','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1064567"><span id="translatedtitle"><span class="hlt">Single-Pass</span> Flow-Through Test Elucidation of Weathering Behavior and Evaluation of Contaminant Release Models for Hanford Tank Residual Radioactive Waste</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cantrell, Kirk J.; Carroll, Kenneth C.; Buck, Edgar C.; Neiner, Doinita; Geiszler, Keith N.</p> <p>2013-01-01</p> <p>Contaminant release models are required to evaluate and predict long-term environmental impacts of even residual amounts of high-level radioactive waste after cleanup and closure of radioactively contaminated sites such as the DOE’s Hanford Site. More realistic and representative models have been developed for release of uranium, technetium, and chromium from Hanford Site tanks C-202, C-203, and C-103 residual wastes using data collected with a <span class="hlt">single-pass</span> flow-through test (SPFT) method. These revised models indicate that contaminant release concentrations from these residual wastes will be considerably lower than previous estimates based on batch experiments. For uranium, a thermodynamic solubility model provides an effective description of uranium release, which can account for differences in pore fluid chemistry contacting the waste that could occur through time and as a result of different closure scenarios. Under certain circumstances in the SPFT experiments various calcium rich precipitates (calcium phosphates and calcite) form on the surfaces of the waste particles, inhibiting dissolution of the underlying uranium phases in the waste. This behavior was not observed in previous batch experiments. For both technetium and chromium, empirical release models were developed. In the case of technetium, release from all three wastes was modeled using an equilibrium Kd model. For chromium release, a constant concentration model was applied for all three wastes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://efdl.cims.nyu.edu/publications/refereed/jglaciology_helheim_tides_2015.pdf','EPRINT'); return false;" href="http://efdl.cims.nyu.edu/publications/refereed/jglaciology_helheim_tides_2015.pdf"><span id="translatedtitle">Tidally driven ice speed variation at Helheim Glacier, Greenland, observed with terrestrial <span class="hlt">radar</span> interferometry</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Holland, David</p> <p></p> <p>Tidally driven ice speed variation at Helheim Glacier, Greenland, observed with terrestrial <span class="hlt">radar</span> a terrestrial <span class="hlt">radar</span> <span class="hlt">interferometer</span> (TRI) at Helheim Glacier, Greenland, in August 2013, to study the effects velocity was up to 25 m d­1 . Our measurements show that the glacier moves out of phase with the semi-diurnal</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/867880','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/867880"><span id="translatedtitle">Multipulsed dynamic moire <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Deason, Vance A. (Idaho Falls, ID)</p> <p>1991-01-01</p> <p>An improved dynamic moire <span class="hlt">interferometer</span> comprised of a lasing medium providing a plurality of beams of coherent light, a multiple q-switch producing multiple trains of 100,000 or more pulses per second, a combining means collimating multiple trains of pulses into substantially a single train and directing beams to specimen gratings affixed to a test material, and a controller, triggering and sequencing the emission of the pulses with the occurrence and recording of a dynamic loading event.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..DMP.Q1168C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..DMP.Q1168C"><span id="translatedtitle">Cold Lithium Atom <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cassella, Kayleigh; Copenhaver, Eric; Lai, Chen; Hamilton, Paul; Estey, Brian; Feng, Yanying; Mueller, Holger</p> <p>2015-05-01</p> <p>Atom <span class="hlt">interferometers</span> often use heavy alkali atoms such as rubidium or cesium. In contrast, interferometry with light atoms offers a larger recoil velocity and recoil energy, yielding a larger interference signal. This would allow for sensitive measurements of the fine structure constant, gravity gradients and spatially varying potentials. We have built the first light-pulse cold-atom <span class="hlt">interferometer</span> with lithium in a Mach-Zehnder geometry based on short (100 ns), intense (2.5 W/cm2) pulses. We initially capture approximately 107 lithium atoms at a temperature of about 300 ?K in a magneto-optical trap. To perform interferometry, we couple the F = 1 and F = 2 hyperfine levels of the ground state with a sequence of two-photon Raman transitions, red-detuned from lithium's unresolved 2P3/2 state. Cold lithium atoms offer a broad range of new possibilities for atom interferometry including a large recoil velocity and a fermionic and bosonic isotope. Lithium's isotopes also allow for independent measurements of gravity thus constraining the equivalence principle violations predicted by the Standard-Model Extension. In the near future, we plan to perform a recoil measurement using a Ramsey-Bordé <span class="hlt">interferometer</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013PASP..125.1226C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013PASP..125.1226C"><span id="translatedtitle">The Keck <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Colavita, M. M.; Wizinowich, P. L.; Akeson, R. L.; Ragland, S.; Woillez, J. M.; Millan-Gabet, R.; Serabyn, E.; Abajian, M.; Acton, D. S.; Appleby, E.; Beletic, J. W.; Beichman, C. A.; Bell, J.; Berkey, B. C.; Berlin, J.; Boden, A. F.; Booth, A. J.; Boutell, R.; Chaffee, F. H.; Chan, D.; Chin, J.; Chock, J.; Cohen, R.; Cooper, A.; Crawford, S. L.; Creech-Eakman, M. J.; Dahl, W.; Eychaner, G.; Fanson, J. L.; Felizardo, C.; Garcia-Gathright, J. I.; Gathright, J. T.; Hardy, G.; Henderson, H.; Herstein, J. S.; Hess, M.; Hovland, E. E.; Hrynevych, M. A.; Johansson, E.; Johnson, R. L.; Kelley, J.; Kendrick, R.; Koresko, C. D.; Kurpis, P.; Le Mignant, D.; Lewis, H. A.; Ligon, E. R.; Lupton, W.; McBride, D.; Medeiros, D. W.; Mennesson, B. P.; Moore, J. D.; Morrison, D.; Nance, C.; Neyman, C.; Niessner, A.; Paine, C. G.; Palmer, D. L.; Panteleeva, T.; Papin, M.; Parvin, B.; Reder, L.; Rudeen, A.; Saloga, T.; Sargent, A.; Shao, M.; Smith, B.; Smythe, R. F.; Stomski, P.; Summers, K. R.; Swain, M. R.; Swanson, P.; Thompson, R.; Tsubota, K.; Tumminello, A.; Tyau, C.; van Belle, G. T.; Vasisht, G.; Vause, J.; Vescelus, F.; Walker, J.; Wallace, J. K.; Wehmeier, U.; Wetherell, E.</p> <p>2013-10-01</p> <p>The Keck <span class="hlt">Interferometer</span> (KI) combined the two 10 m W. M. Keck Observatory telescopes on Mauna Kea, Hawaii, as a long-baseline near- and mid-infrared <span class="hlt">interferometer</span>. Funded by NASA, it operated from 2001 until 2012. KI used adaptive optics on the two Keck telescopes to correct the individual wavefronts, as well as active fringe tracking in all modes for path-length control, including the implementation of cophasing to provide long coherent integration times. KI implemented high sensitivity fringe-visibility measurements at H (1.6 ?m), K (2.2 ?m), and L (3.8 ?m) bands, and nulling measurements at N band (10 ?m), which were used to address a broad range of science topics. Supporting these capabilities was an extensive <span class="hlt">interferometer</span> infrastructure and unique instrumentation, including some additional functionality added as part of the NSF-funded ASTRA program. This paper provides an overview of the instrument architecture and some of the key design and implementation decisions, as well as a description of all of the key elements and their configuration at the end of the project. The objective is to provide a view of KI as an integrated system, and to provide adequate technical detail to assess the implementation. Included is a discussion of the operational aspects of the system, as well as of the achieved system performance. Finally, details on V2 calibration in the presence of detector nonlinearities as applied in the data pipeline are provided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/26252684','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/26252684"><span id="translatedtitle">Atom-Light Hybrid <span class="hlt">Interferometer</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chen, Bing; Qiu, Cheng; Chen, Shuying; Guo, Jinxian; Chen, L Q; Ou, Z Y; Zhang, Weiping</p> <p>2015-07-24</p> <p>A new type of hybrid atom-light <span class="hlt">interferometer</span> is demonstrated with atomic Raman amplification processes replacing the beam splitting elements in a traditional <span class="hlt">interferometer</span>. This nonconventional <span class="hlt">interferometer</span> involves correlated optical and atomic waves in the two arms. The correlation between atoms and light developed with the Raman process makes this <span class="hlt">interferometer</span> different from conventional <span class="hlt">interferometers</span> with linear beam splitters. It is observed that the high-contrast interference fringes are sensitive to the optical phase via a path change as well as the atomic phase via a magnetic field change. This new atom-light correlated hybrid <span class="hlt">interferometer</span> is a sensitive probe of the atomic internal state and should find wide applications in precision measurement and quantum control with atoms and photons. PMID:26252684</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvL.115d3602C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvL.115d3602C"><span id="translatedtitle">Atom-Light Hybrid <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chen, Bing; Qiu, Cheng; Chen, Shuying; Guo, Jinxian; Chen, L. Q.; Ou, Z. Y.; Zhang, Weiping</p> <p>2015-07-01</p> <p>A new type of hybrid atom-light <span class="hlt">interferometer</span> is demonstrated with atomic Raman amplification processes replacing the beam splitting elements in a traditional <span class="hlt">interferometer</span>. This nonconventional <span class="hlt">interferometer</span> involves correlated optical and atomic waves in the two arms. The correlation between atoms and light developed with the Raman process makes this <span class="hlt">interferometer</span> different from conventional <span class="hlt">interferometers</span> with linear beam splitters. It is observed that the high-contrast interference fringes are sensitive to the optical phase via a path change as well as the atomic phase via a magnetic field change. This new atom-light correlated hybrid <span class="hlt">interferometer</span> is a sensitive probe of the atomic internal state and should find wide applications in precision measurement and quantum control with atoms and photons.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19960052885','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19960052885"><span id="translatedtitle">TIMED Doppler <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Killeen, Timothy L. (Principal Investigator)</p> <p>1995-01-01</p> <p>The Timed Doppler <span class="hlt">Interferometer</span> (TIDI) will accurately and precisely determine the global vector MLTI (Mesosphere and Lower Thermosphere) wind, temperature, and density profiles. It will measure characteristics of the gravity wave and planetary wave spectra. The tidal characteristics of temperature, density, and wind in the MLTI will be determined. The neutral and ion winds will be measured to characterize the electrodynamical behavior of the MLTI. Oxygen and O2 abundances and nocticulent cloud activity will be measured. This review goes into the calibration and error sources, optical design, mechanisms design, detector design, electronics design, microprocessor and flight software design, and quality assurance and parts.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19860018916','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19860018916"><span id="translatedtitle">Improved Skin Friction <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Westphal, R. V.; Bachalo, W. D.; Houser, M. H.</p> <p>1986-01-01</p> <p>An improved system for measuring aerodynamic skin friction which uses a dual-laser-beam oil-film <span class="hlt">interferometer</span> was developed. Improvements in the optical hardware provided equal signal characteristics for each beam and reduced the cost and complexity of the system by replacing polarization rotation by a mirrored prism for separation of the two signals. An automated, objective, data-reduction procedure was implemented to eliminate tedious manual manipulation of the interferometry data records. The present system was intended for use in two-dimensional, incompressible flows over a smooth, level surface without pressure gradient, but the improvements discussed are not limited to this application.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1981STIN...8232718C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1981STIN...8232718C"><span id="translatedtitle">Laser <span class="hlt">interferometer</span> calibration station</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Campolmi, R. W.; Krupski, S. J.</p> <p>1981-10-01</p> <p>The laser <span class="hlt">interferometer</span> is a versatile tool, used for calibration over both long and short distances. It is considered traceable to the National Bureau of Standards. The system developed under this project was to be capable of providing for the calibration of many types of small linear measurement devices. The logistics of the original concept of one location for calibration of all mics, calipers, etc. at a large manufacturing facility proved unworkable. The equipment was instead used for the calibration of the large machines used to manufacture cannon tubes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1989CEST........77H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1989CEST........77H"><span id="translatedtitle"><span class="hlt">Radar</span> vision</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haykin, Simon</p> <p>1989-09-01</p> <p>This paper describes work undertaken at the Communications Research Laboratory (CRL) at McMaster University on a <span class="hlt">radar</span>-based intelligent remote sensing device that is capable of developing an understanding or cognition of the surrounding environment. The proposed system has three levels of processing: (1) low level vision will perform preprocessing on incoming data; (2) intermediate level vision will perform feature extraction and target tracking; and (3) high level vision will perform knowledge processing for the purpose of target interpretation. A feedback link from this latter stage allows the <span class="hlt">radar</span> to be automatically reconfigured for a different look at the target. Interactive probing of the potential target will continue until target recognition occurs. A sophisticated coherent cross polarizing <span class="hlt">radar</span> with pulse compression capabilities, IPIX, has been developed and successfully tested in an ice infested marine environment off Newfoundland. Image analysis for IPIX is implemented on a Warp systolic machine, a highly parallel processor designed for vision research. A comparison between <span class="hlt">radar</span> and human vision systems is provided.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_5 --> <div id="page_6" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="101"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/15185','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/15185"><span id="translatedtitle">The Stress-Relief Cracking Susceptibility of a New Ferritic Steel - Part I: <span class="hlt">Single-Pass</span> Heat-Affected Zone Simulations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>NAWROCKI,J.G.; DUPONT,J.N.; ROBINO,CHARLES V.; MARDER,A.R.</p> <p>1999-12-15</p> <p>The stress-relief cracking susceptibility of <span class="hlt">single-pass</span> welds in a new ferritic steel, HCM2S, has been evaluated and compared to 2.25Cr-1Mo steel using Gleeble techniques. Simulated coarse-grained heat-affected zones (CGHAZ) were produced under a range of energy inputs and tested at various post-weld heat treatment (PWHT) temperatures. Both alloys were tested at a stress of 325 MPa. The 2.25 Cr-1Mo steel was also tested at 270 MPa to normalize for the difference in yield strength between the two materials. Light optical and scanning electron microscopy were used to characterize the CGHAZ microstructure. The ''as-welded'' CGHAZ of each alloy consisted of lath martensite or bainite and had approximately equal prior austenite grain sizes. The as-welded hardness of the 2.25Cr-1Mo steel CGHAZ was significantly higher than that of the HCM2S alloy. Over the range studied energy input had no effect on the as-welded microstructure or hardness of either alloy. The energy input also had no effect on the stress-relief cracking susceptibility of either material. Both alloys failed intergranularly along prior austenite grain boundaries under all test conditions. The 2.25Cr-1Mo steel samples experienced significant macroductility and some microductility when tested at 325 MPa. The ductility decreased significantly when tested at 270 MPa but was still higher that than of HCM2S at each test condition. The time to failure decreased with increasing PWHT Temperature for each material. There was no significant difference in the times to failure between the two materials. Varying energy input and stress had no effect on the time-to failure. The ductility, as measured by reduction in are% increased with increasing PWHT temperature for 2.25 Cr-1Mo steel tested at both stresses. However, PWHT temperature had no effect on the ductility of HCM2S. The hardness of the CGHAZ for 2.25Cr-1Mo steel decreased significantly after PWHT, but remained constant for HCM2S. The differences in stress-relief cracking response are discussed in terms of the differences in composition and expected carbide precipitation sequence for each alloy during PWHT.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940011421','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940011421"><span id="translatedtitle">TRMM <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Okamoto, Kenichi</p> <p>1993-01-01</p> <p>The results of a conceptual design study and the performance of key components of the Bread Board Model (BBM) of the Tropical Rainfall Measuring Mission (TRMM) <span class="hlt">radar</span> are presented. The <span class="hlt">radar</span>, which operates at 13.8 GHz and is designed to meet TRMM mission objectives, has a minimum measurable rain rate of 0.5 mm/h with a range resolution of 250 m, a horizontal resolution of about 4 km, and a swath width of 220 km. A 128-element active phased array system is adopted to achieve contiguous scanning within the swath. The basic characteristics of BBM were confirmed by experiments. The development of EM started with the cooperation of NASDA and CRL.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20100033124&hterms=1073&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3D%2526%25231073','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20100033124&hterms=1073&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3D%2526%25231073"><span id="translatedtitle">The Fizeau <span class="hlt">Interferometer</span> Testbed</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Zhang, Xiaolei; Carpenter, Kenneth G.; Lyon, Richard G,; Huet, Hubert; Marzouk, Joe; Solyar, Gregory</p> <p>2003-01-01</p> <p>The Fizeau <span class="hlt">Interferometer</span> Testbed (FIT) is a collaborative effort between NASA's Goddard Space Flight Center, the Naval Research Laboratory, Sigma Space Corporation, and the University of Maryland. The testbed will be used to explore the principles of and the requirements for the full, as well as the pathfinder, Stellar Imager mission concept. It has a long term goal of demonstrating closed-loop control of a sparse array of numerous articulated mirrors to keep optical beams in phase and optimize interferometric synthesis imaging. In this paper we present the optical and data acquisition system design of the testbed, and discuss the wavefront sensing and control algorithms to be used. Currently we have completed the initial design and hardware procurement for the FIT. The assembly and testing of the Testbed will be underway at Goddard's Instrument Development Lab in the coming months.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22016137','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22016137"><span id="translatedtitle">THE KECK <span class="hlt">INTERFEROMETER</span> NULLER</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Serabyn, E.; Mennesson, B.; Colavita, M. M.; Koresko, C.; Kuchner, M. J.</p> <p>2012-03-20</p> <p>The Keck <span class="hlt">Interferometer</span> Nuller (KIN), the first operational separated-aperture infrared nulling <span class="hlt">interferometer</span>, was designed to null the mid-infrared emission from nearby stars so as to ease the measurement of faint circumstellar emission. This paper describes the basis of the KIN's four-beam, two-stage measurement approach and compares it to the simpler case of a two-beam nuller. In the four-beam KIN system, the starlight is first nulled in a pair of nullers operating on parallel 85 m Keck-Keck baselines, after which 'cross-combination' on 4 m baselines across the Keck apertures is used to modulate and detect residual coherent off-axis emission. Comparison to the constructive stellar fringe provides calibration. The response to an extended source is similar in the two cases, except that the four-beam response includes a term due to the visibility of the source on the cross-combiner baseline-a small effect for relatively compact sources. The characteristics of the dominant null depth errors are also compared for the two cases. In the two-beam nuller, instrumental imperfections and asymmetries lead to a series of quadratic, positive-definite null leakage terms. For the four-beam nuller, the leakage is instead a series of correlation cross-terms combining corresponding errors in each of the two nullers, which contribute offsets only to the extent that these errors are correlated on the timescale of the measurement. This four-beam architecture has allowed a significant ({approx}order of magnitude) improvement in mid-infrared long-baseline fringe-visibility accuracies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19930016647','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19930016647"><span id="translatedtitle">MIT's <span class="hlt">interferometer</span> CST testbed</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hyde, Tupper; Kim, ED; Anderson, Eric; Blackwood, Gary; Lublin, Leonard</p> <p>1990-01-01</p> <p>The MIT Space Engineering Research Center (SERC) has developed a controlled structures technology (CST) testbed based on one design for a space-based optical <span class="hlt">interferometer</span>. The role of the testbed is to provide a versatile platform for experimental investigation and discovery of CST approaches. In particular, it will serve as the focus for experimental verification of CSI methodologies and control strategies at SERC. The testbed program has an emphasis on experimental CST--incorporating a broad suite of actuators and sensors, active struts, system identification, passive damping, active mirror mounts, and precision component characterization. The SERC testbed represents a one-tenth scaled version of an optical <span class="hlt">interferometer</span> concept based on an inherently rigid tetrahedral configuration with collecting apertures on one face. The testbed consists of six 3.5 meter long truss legs joined at four vertices and is suspended with attachment points at three vertices. Each aluminum leg has a 0.2 m by 0.2 m by 0.25 m triangular cross-section. The structure has a first flexible mode at 31 Hz and has over 50 global modes below 200 Hz. The stiff tetrahedral design differs from similar testbeds (such as the JPL Phase B) in that the structural topology is closed. The tetrahedral design minimizes structural deflections at the vertices (site of optical components for maximum baseline) resulting in reduced stroke requirements for isolation and pointing of optics. Typical total light path length stability goals are on the order of lambda/20, with a wavelength of light, lambda, of roughly 500 nanometers. It is expected that active structural control will be necessary to achieve this goal in the presence of disturbances.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10594','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10594"><span id="translatedtitle">Evaluation of the Long-Term Performance of Titanate Ceramics for Immobilization of Excess Weapons Plutonium: Results from Pressurized Unsaturated Flow and <span class="hlt">Single</span> <span class="hlt">Pass</span> Flow-Through Testing</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>BP McGrail; HT Schaef; JP Icenhower; PF Martin; RD Orr; VL Legore</p> <p>1999-09-13</p> <p>This report summarizes our findings from pressurized unsaturated flow (PUF) and <span class="hlt">single-pass</span> flow-through (SPFT) experiments to date. Results from the PUF test of a Pu-bearing ceramic with enclosing surrogate high-level waste glass show that the glass reacts rapidly to alteration products. Glass reaction causes variations in the solution pH in contact with the ceramic materials. We also document variable concentrations of Pu in solution, primarily in colloidal form, which appear to be related to secular variations in solution composition. The apparent dissolution rate of the ceramic waste form, based on Ba concentrations in the effluent, is estimated at {le} 10{sup {minus}5} g/(m{sup 2} {center_dot} d). Pu-bearing colloids were recovered in the size range of 0.2 to 2 {micro}m, but it is not clear that such entities would be transported in a system that is not advective-flow dominated. Results from SPFT experiments give information on the corrosion resistance of two surrogate Pu-ceramics (Ce-pyrochlore and Ce-zirconolite) at 90 C over a pH range of 2 to 12. The two ceramics were doped with minor quantities ({approximately}0.1 mass%) of MoO{sub 3}, so that concentrations of Mo in the effluent solution could be used to monitor the reaction behavior of the materials. The data obtained thus far from experiments with durations up to 150 d do not conclusively prove that the solid-aqueous solution systems have reached steady-state conditions. Therefore, the dissolution mechanism cannot be determined. Apparent dissolution rates of the two ceramic materials based on Ce, Gd, and Mo concentrations in the effluent solutions from the SPFT are nearly identical and vary between 1.1 to 8.5 x 10{sup {minus}4} g/(m{sup 2} {center_dot} d). In addition, the data reveal a slightly amphoteric dissolution behavior, with a minimum apparent rate at pH = 7 to 8, over the pH range examined. Results from two related ceramic samples suggest that radiation damage can have a measurable effect on the dissolution of titanium-based ceramics. The rare earth pyrochlores, Gd{sub 2}Ti{sub 2}O{sub 7} and Lu{sub 2}Ti{sub 2}O{sub 7}, are being studied as part of the DOE Environmental Management Science Program, and the results are germane to this study. The corrosion resistances of both heavy-ion bombarded and pristine (non-bombarded) specimens are being examined with the SPFT test. Initial data indicate that the dissolution rate may increase by a factor of 3 times or more when these materials become amorphous from radiation damage.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/1175412','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/1175412"><span id="translatedtitle">Using dynamic interferometric synthetic aperature <span class="hlt">radar</span> (InSAR) to image fast-moving surface waves</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Vincent, Paul</p> <p>2005-06-28</p> <p>A new differential technique and system for imaging dynamic (fast moving) surface waves using Dynamic Interferometric Synthetic Aperture <span class="hlt">Radar</span> (InSAR) is introduced. This differential technique and system can sample the fast-moving surface displacement waves from a plurality of moving platform positions in either a repeat-pass single-antenna or a <span class="hlt">single-pass</span> mode having a single-antenna dual-phase receiver or having dual physically separate antennas, and reconstruct a plurality of phase differentials from a plurality of platform positions to produce a series of desired interferometric images of the fast moving waves.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20090031860&hterms=exoplanet&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dexoplanet','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20090031860&hterms=exoplanet&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dexoplanet"><span id="translatedtitle">Balloon Exoplanet Nulling <span class="hlt">Interferometer</span> (BENI)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lyon, Richard G.; Clampin, Mark; Woodruff, Robert A.; Vasudevan, Gopal; Ford, Holland; Petro, Larry; Herman, Jay; Rinehart, Stephen; Carpenter, Kenneth; Marzouk, Joe</p> <p>2009-01-01</p> <p>We evaluate the feasibility of using a balloon-borne nulling <span class="hlt">interferometer</span> to detect and characterize exosolar planets and debris disks. The existing instrument consists of a 3-telescope Fizeau imaging <span class="hlt">interferometer</span> with 3 fast steering mirrors and 3 delay lines operating at 800 Hz for closed-loop control of wavefront errors and fine pointing. A compact visible nulling <span class="hlt">interferometer</span> is under development which when coupled to the imaging <span class="hlt">interferometer</span> would in-principle allow deep suppression of starlight. We have conducted atmospheric simulations of the environment above 100,000 feet and believe balloons are a feasible path forward towards detection and characterization of a limited set of exoplanets and their debris disks. Herein we will discuss the BENI instrument, the balloon environment and the feasibility of such as mission.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/6295560','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/6295560"><span id="translatedtitle">Compact portable diffraction moire <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Deason, V.A.; Ward, M.B.</p> <p>1988-05-23</p> <p>A compact and portable moire <span class="hlt">interferometer</span> used to determine surface deformations of an object. The improved <span class="hlt">interferometer</span> is comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent wave splitters, and collimating lenses directing the split beam at one or more specimen gratings. Observations means including film and video cameras may be used to view and record the resultant fringe patterns. 7 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/867049','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/867049"><span id="translatedtitle">Compact portable diffraction moire <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Deason, Vance A. (Shelley, ID); Ward, Michael B. (Idaho Falls, ID)</p> <p>1989-01-01</p> <p>A compact and portable moire <span class="hlt">interferometer</span> used to determine surface deformations of an object. The improved <span class="hlt">interferometer</span> is comprised of a laser beam, optical and fiber optics devices coupling the beam to one or more evanescent wave splitters, and collimating lenses directing the split beam at one or more specimen gratings. Observation means including film and video cameras may be used to view and record the resultant fringe patterns.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/867195','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/867195"><span id="translatedtitle">Surface profiling <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Takacs, Peter Z. (P.O. Box 385, Upton, NY 11973); Qian, Shi-Nan (Hefei Synchrotron Radiation Laboratory, University of Science and, Hefei, Anhui, CN)</p> <p>1989-01-01</p> <p>The design of a long-trace surface profiler for the non-contact measurement of surface profile, slope error and curvature on cylindrical synchrotron radiation (SR) mirrors. The optical system is based upon the concept of a pencil-beam <span class="hlt">interferometer</span> with an inherent large depth-of-field. The key feature of the optical system is the zero-path-difference beam splitter, which separates the laser beam into two colinear, variable-separation probe beams. A linear array detector is used to record the interference fringe in the image, and analysis of the fringe location as a function of scan position allows one to reconstruct the surface profile. The optical head is mounted on an air bearing slide with the capability to measure long aspheric optics, typical of those encountered in SR applications. A novel feature of the optical system is the use of a transverse "outrigger" beam which provides information on the relative alignment of the scan axis to the cylinder optic symmetry axis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1993STIN...9421646L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993STIN...9421646L"><span id="translatedtitle">Michelson <span class="hlt">Interferometer</span> (MINT)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lacis, Andrew; Carlson, Barbara</p> <p>1993-09-01</p> <p>MINT is a Michelson <span class="hlt">interferometer</span> designed to measure the thermal emission from the earth at high spectral resolution (2/cm) over a broad spectral range (250-1700/cm, 6-40 mu m) with contiguous 3-pixel wide (12 mrad, 8 km field of view) along-track sampling. MINT is particularly well suited for monitoring cloud properties (cloud cover, effective temperature, optical thickness, ice/water phase, and effective particle size) both day and night, as well as tropospheric water vapor, ozone, and temperature. The key instrument characteristics that make MINT ideally suited for decadal monitoring purposes are: high wavelength to wavelength precision across the full IR spectrum with high spectral resolution; space-proven long-term durability and calibration stability; and small size, low cost, low risk instrument incorporating the latest detector and electronics technology. MINT also incorporates simplicity in design and operation by utilizing passively cooled DTGS detectors and nadir viewing geometry (with target motion compensation). MINT measurement objectives, instrument characteristics, and key advantages are summarized in this paper.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19940017173','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19940017173"><span id="translatedtitle">Michelson <span class="hlt">Interferometer</span> (MINT)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lacis, Andrew; Carlson, Barbara</p> <p>1993-01-01</p> <p>MINT is a Michelson <span class="hlt">interferometer</span> designed to measure the thermal emission from the earth at high spectral resolution (2/cm) over a broad spectral range (250-1700/cm, 6-40 mu m) with contiguous 3-pixel wide (12 mrad, 8 km field of view) along-track sampling. MINT is particularly well suited for monitoring cloud properties (cloud cover, effective temperature, optical thickness, ice/water phase, and effective particle size) both day and night, as well as tropospheric water vapor, ozone, and temperature. The key instrument characteristics that make MINT ideally suited for decadal monitoring purposes are: high wavelength to wavelength precision across the full IR spectrum with high spectral resolution; space-proven long-term durability and calibration stability; and small size, low cost, low risk instrument incorporating the latest detector and electronics technology. MINT also incorporates simplicity in design and operation by utilizing passively cooled DTGS detectors and nadir viewing geometry (with target motion compensation). MINT measurement objectives, instrument characteristics, and key advantages are summarized in this paper.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/5391804','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/5391804"><span id="translatedtitle">Observation and theory of the <span class="hlt">radar</span> aurora</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sahr, J.D.</p> <p>1990-01-01</p> <p>Plasma density irregularities occurring near the Aurora Borealis cause scattering of HF, VHF, and UHF radio waves. Analysis of the resulting <span class="hlt">radar</span> signal provides great detail about the spatial and temporal characteristics of these auroral E region irregularities. Observations are presented of the <span class="hlt">radar</span> aurora from recent campaigns in northern Sweden. After reviewing the basic theory and observations of auroral electrojet irregularities, a simple nonlinear fluid theory of electrojet ion-acoustic waves is introduced, and reduced to a form of the three-wave interaction equations. This theory provides a simple mechanism for excitation of linearly stable waves at large aspect and flow angles, as well as a prediction of the power spectra that a coherent scatter <span class="hlt">radar</span> should observe. In addition, this theory may be able to account for type 3 waves without resorting to ion gyro modes, such as the electrostatic ion-cyclotron wave. During the course of the research a simple new <span class="hlt">radar</span> transmitting mode and signal processing algorithm was generated which very simply solves a frequency aliasing problem that often occurs in CUPRI auroral <span class="hlt">radar</span> studies. Several new <span class="hlt">radar</span> data analysis routines were developed, including the principally cross-beam image and scatter plots of the second versus first moments of the power spectrum of the irregularities. Analysis of vertical <span class="hlt">interferometer</span> data shows that type 3 waves originate at ordinary electrojet altitudes, not in the upper E region, from which it is concluded that the electrostatic ion-cyclotron mode does not generate type 3 waves. The measured height of type 3 waves and other spectral analyses provide support for the pure ion-acoustic theory of type 3 waves. Suggestions are offered for hardware improvements to the CUPRI <span class="hlt">radar</span>, new experiments to test new and existing theories.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008PhDT.......102K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008PhDT.......102K"><span id="translatedtitle">Meteor <span class="hlt">radar</span> signal processing and error analysis</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kang, Chunmei</p> <p></p> <p>Meteor wind <span class="hlt">radar</span> systems are a powerful tool for study of the horizontal wind field in the mesosphere and lower thermosphere (MLT). While such systems have been operated for many years, virtually no literature has focused on <span class="hlt">radar</span> system error analysis. The instrumental error may prevent scientists from getting correct conclusions on geophysical variability. The <span class="hlt">radar</span> system instrumental error comes from different sources, including hardware, software, algorithms and etc. <span class="hlt">Radar</span> signal processing plays an important role in <span class="hlt">radar</span> system and advanced signal processing algorithms may dramatically reduce the <span class="hlt">radar</span> system errors. In this dissertation, <span class="hlt">radar</span> system error propagation is analyzed and several advanced signal processing algorithms are proposed to optimize the performance of <span class="hlt">radar</span> system without increasing the instrument costs. The first part of this dissertation is the development of a time-frequency waveform detector, which is invariant to noise level and stable to a wide range of decay rates. This detector is proposed to discriminate the underdense meteor echoes from the background white Gaussian noise. The performance of this detector is examined using Monte Carlo simulations. The resulting probability of detection is shown to outperform the often used power and energy detectors for the same probability of false alarm. Secondly, estimators to determine the Doppler shift, the decay rate and direction of arrival (DOA) of meteors are proposed and evaluated. The performance of these estimators is compared with the analytically derived Cramer-Rao bound (CRB). The results show that the fast maximum likelihood (FML) estimator for determination of the Doppler shift and decay rate and the spatial spectral method for determination of the DOAs perform best among the estimators commonly used on other <span class="hlt">radar</span> systems. For most cases, the mean square error (MSE) of the estimator meets the CRB above a 10dB SNR. Thus meteor echoes with an estimated SNR below 10dB are discarded due to the potential of producing a biased estimate. The precision of the estimated parameters can then be computed using their CRB values as a proxy for the estimated variance. These errors propagate to form the instrumental errors on the height and horizontal wind measurements. Thirdly, the <span class="hlt">interferometer</span> configuration of interferometric meteor <span class="hlt">radar</span> system is studied. The <span class="hlt">interferometer</span> uses the phase differences measured at different sensor pairs to determine the DOA of the meteor trail. Typically Jones cross is used in most of current meteor <span class="hlt">radar</span> systems, such as MEDAC and SKYiMet. We have evaluated this configuration with other array geometries,such as 'T', 'L' and circular array to examine their performance on the precision of the DOA estimates. The results show that 'T' array has an overall better CRB than other geometries, while with the yagi antenna pattern as a course determination of the DOA range, the circular array performs the best with the lowest sidelobes on the spatial spectral. A Matlab based planar array design package designed for determination and visualization of the DOA estimation performance for a user designed antenna array was developed. Fourthly, based on the special configuration of the South Pole COBRA system, a low cost computational phase calibration method is proposed. Accurate knowledge of the receiver phase ofsets is another factor that can affect system performance. Lastly, the postprocessing results of the meteor echoes collected during 2005 from the South Pole COBRA system are presented. This <span class="hlt">radar</span> system is shown to have a precision of 2m/s in the horizontal winds, an azimuth precision of 1o, and an elevation precision of 3o. Preliminary scientific results are presented to verify the effectiveness of our processing scheme, and include the seasonal variation of meteor rates as a function of height, and the vertical structure of large semidiurnal tide observed over the South Pole austral summer. The processing schemes and error analysis methods presented in this dissertation can be easily extended to other meteor <span class="hlt">radar</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013PhRvA..88b3809T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013PhRvA..88b3809T"><span id="translatedtitle">Anomalous dynamic backaction in <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tarabrin, Sergey P.; Kaufer, Henning; Khalili, Farid Ya.; Schnabel, Roman; Hammerer, Klemens</p> <p>2013-08-01</p> <p>We analyze the dynamic optomechanical backaction in signal-recycled Michelson and Michelson-Sagnac <span class="hlt">interferometers</span> that are operated off the dark port. We show that in this case—and in contrast to the well-studied canonical form of dynamic backaction on the dark port—optical damping in a Michelson-Sagnac <span class="hlt">interferometer</span> acquires a nonzero value on cavity resonance, and additional stability and instability regions on either side of the resonance, revealing additional regimes of cooling and heating of micromechanical oscillators. In a free-mass Michelson <span class="hlt">interferometer</span> for a certain region of parameters we predict a stable single-carrier optical spring (positive spring and positive damping), which can be utilized for the reduction of quantum noise in future-generation gravitational-wave detectors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010PhRvL.105a3602X','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010PhRvL.105a3602X"><span id="translatedtitle">Optomechanical Cooling with Generalized <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Xuereb, André; Freegarde, Tim; Horak, Peter; Domokos, Peter</p> <p>2010-07-01</p> <p>The fields in multiple-pass <span class="hlt">interferometers</span>, such as the Fabry-Pérot cavity, exhibit great sensitivity not only to the presence but also to the motion of any scattering object within the optical path. We consider the general case of an <span class="hlt">interferometer</span> comprising an arbitrary configuration of generic beam splitters and calculate the velocity-dependent radiation field and the light force exerted on a moving scatterer. We find that a simple configuration, in which the scatterer interacts with an optical resonator from which it is spatially separated, can enhance the optomechanical friction by several orders of magnitude.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/863486','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/863486"><span id="translatedtitle"><span class="hlt">Interferometer</span> for the measurement of plasma density</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Jacobson, Abram R. (Los Alamos, NM)</p> <p>1980-01-01</p> <p>An <span class="hlt">interferometer</span> which combines the advantages of a coupled cavity <span class="hlt">interferometer</span> requiring alignment of only one light beam, and a quadrature <span class="hlt">interferometer</span> which has the ability to track multi-fringe phase excursions unambiguously. The device utilizes a Bragg cell for generating a signal which is electronically analyzed to unambiguously determine phase modulation which is proportional to the path integral of the plasma density.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005AGUFM.P31C0213H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005AGUFM.P31C0213H"><span id="translatedtitle">Challenges to Airborne and Orbital <span class="hlt">Radar</span> Sounding in the Presence of Surface Clutter: Lessons Learned (so far) from the Dry Valleys of Antarctica</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Holt, J. W.; Peters, M. E.; Kempf, S. D.; Morse, D. L.; Blankenship, D. D.</p> <p>2005-12-01</p> <p>The search for life and in-situ resources for exploration on Mars targets both liquid and solid water, whether distributed or in reservoirs. Massive surface ice may cover potential habitats or other features of great interest. Ice-rich layering in the high latitudes holds clues to the climatic history of the planet. Multiple geophysical methods will clearly be necessary to fully characterize these various states of water (and other forms of ice), but <span class="hlt">radar</span> sounding will be a critical component of the effort. Orbital <span class="hlt">radar</span> sounders are already being employed and plans for surface-based and suborbital, above-surface <span class="hlt">radar</span> sounders are being discussed. The difficulties in interpreting data from each type of platform are quite different. Given the lack of existing orbital <span class="hlt">radar</span> sounding data from any planetary body, the analysis of airborne <span class="hlt">radar</span> sounding data is quite useful for assessing the advantages and disadvantages of above-surface <span class="hlt">radar</span> sounding on Mars. In addition to over 300,000 line-km of data collected over the Antarctic ice sheet by airborne <span class="hlt">radar</span> sounding, we have recently analyzed data from the Dry Valleys of Antarctica where conditions and features emulate Mars in several respects. These airborne <span class="hlt">radar</span> sounding data were collected over an ice-free area of Taylor Valley, ice-covered lakes, Taylor Glacier, and Beacon Valley. The pulsed <span class="hlt">radar</span> (52.5 - 67.5 MHz chirp) was coherently recorded. Pulse compression and unfocused SAR processing were applied. One of the most challenging aspects of above-surface <span class="hlt">radar</span> sounding is the determination of echo sources. This can, of course, be problematic for surface-based <span class="hlt">radar</span> sounders given possible subsurface scattering geometries, but it is most severe for above-surface sounders because echoes from cross-track surface topography (surface clutter) can have similar time delays to those from the subsurface. We have developed two techniques to accomplish the identification of this surface clutter in <span class="hlt">single-pass</span> airborne <span class="hlt">radar</span> sounding data. The first technique simulates <span class="hlt">radar</span> data using a digital elevation model (DEM) of surface topography to predict the location and shape of surface echoes in the <span class="hlt">radar</span> data. This is complemented by the cross-track migration of <span class="hlt">radar</span> echoes onto the surface. These migrated echoes are superimposed on imagery in order to correlate them with potential surface sources. Using these techniques enabled us to identify a number of echoes in a 24-km segment of the Dry Valleys flight path as arising from the surface and to identify subsurface echoes under the main trunk of Taylor Glacier and possibly multiple reflectors beneath the toe of Taylor Glacier. Surface-based <span class="hlt">radar</span> confirms the thickness of the glacier at three crossing points. In the ice-free section of the test segment no real subsurface reflectors were found, indicating that the electromagnetic properties of the ground there do not allow significant <span class="hlt">radar</span> penetration at 60 MHz and/or no <span class="hlt">radar</span>-significant subsurface interfaces exist. These results illustrate the importance of using complementary techniques, the usefulness of a DEM, and the limitations of <span class="hlt">single-pass</span> <span class="hlt">radar</span> sounding data. Advanced processing techniques utilizing <span class="hlt">radar</span> phase information show promise for achieving better clutter removal for <span class="hlt">single-pass</span> data. Multi-pass data that we recently collected in the Dry Valleys should allow for the development of techniques to reduce or eliminate the need for a surface elevation model.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19820056699&hterms=gelatin&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dgelatin','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19820056699&hterms=gelatin&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dgelatin"><span id="translatedtitle">Holographic Twyman-Green <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Chen, C. W.; Breckinridge, J. B.</p> <p>1982-01-01</p> <p>A dichromated gelatin off-axis Fresnel zone plate was designed, fabricated, and used in a new type of <span class="hlt">interferometer</span> for optical metrology. This single hologram optical element combines the functions of a beam splitter, beam diverger, and aberrated null lens. Data presented show the successful application for an interferometric test of an f/6, 200-mm diam parabolic mirror.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_6 --> <div id="page_7" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="121"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/6967338','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/6967338"><span id="translatedtitle"><span class="hlt">Radar</span> scattering from the summer polar mesosphere: Theory and observations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cho, J.Y.N.</p> <p>1993-01-01</p> <p>The anomalously large <span class="hlt">radar</span> reflectivities observed in the summer polar mesosphere have eluded satisfactory explanation until now. The author proposes that the following chain of causality is responsible for the so-called polar mesosphere summer echoes (PMSE): The uniquely low temperature in the summer mesopause produce ice aerosols. Because the aerosols exist in a plasma, they become electrically charged. The ambient electrons become coupled to the aerosols through electric fields and their effective diffusivity is retarded due to the large size of the aerosols. The reduction in diffusivity allows electron density inhomogeneities to be maintained at the <span class="hlt">radar</span> Bragg scales. The <span class="hlt">radar</span> waves are then scattered by the inhomogeneities. The above concept is supported by developing a quantitative theory of ambipolar diffusion in the mesosphere. The results to isotropic turbulence and Fresnel <span class="hlt">radar</span> scatter are applied to show that the observed <span class="hlt">radar</span> reflectivities can be explained by the theory. It is shown that the presence of realistic charged aerosols are sufficient to explain PMSE. The author also shows that dressed aerosol <span class="hlt">radar</span> scatter can only apply to echoes detected by UHF <span class="hlt">radars</span>. The data is taken with the Sondrestrom 1.29-GHz <span class="hlt">radar</span> and attribute it to dressed aerosol scatter. The author used the Cornell University portable <span class="hlt">radar</span> <span class="hlt">interferometer</span> (CUPRI) to observe the mesosphere while rockets carrying in situ sensors were flown through two PMSE occurrences and a noctilucent cloud/PMSE event. The first simultaneous height comparison between noctilucent clouds and PMSE show that the <span class="hlt">radar</span> scattering region was near or slightly above the visible cloud layer. The author also infers from aspect sensitivity measurements and Doppler spectrograms that there were two distinct types of PMSE: Enhanced turbulent scatter and partial (Fresnel) reflection from steep edges in the electron density. Both mechanisms require an anomalously low electron diffusion coefficient.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19930010406','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19930010406"><span id="translatedtitle">Doppler <span class="hlt">radar</span> results</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bracalente, Emedio M.</p> <p>1992-01-01</p> <p>The topics are covered in viewgraph form and include the following: (1) a summary of <span class="hlt">radar</span> flight data collected; (2) a video of combined aft cockpit, nose camera, and <span class="hlt">radar</span> hazard displays; (3) a comparison of airborne <span class="hlt">radar</span> F-factor measurements with in situ and Terminal Doppler Weather <span class="hlt">Radar</span> (TDWR) F-factors for some sample events; and (4) a summary of wind shear detection performance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800002740','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800002740"><span id="translatedtitle">Lunar <span class="hlt">radar</span> backscatter studies</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Thompson, T. W.</p> <p>1979-01-01</p> <p>The lunar surface material in the Plato area is characterized using Earth based visual, infrared, and <span class="hlt">radar</span> signatures. <span class="hlt">Radar</span> scattering in the lunar regolith with an existing optical scattering computer program is modeled. Mapping with 1 to 2 km resolution of the Moon using a 70 cm Arecibo <span class="hlt">radar</span> is presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/686444','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/686444"><span id="translatedtitle">Continuous-wave quasi-phase-matched generation of 60thinspthinspmW at 465thinspthinspnm by <span class="hlt">single-pass</span> frequency doubling of a laser diode in backswitch-poled lithium niobate</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Batchko, R.G.; Fejer, M.M.; Byer, R.L.; Woll, D.; Wallenstein, R.; Shur, V.Y.; Erman, L.</p> <p>1999-09-01</p> <p>We report continuous-wave <span class="hlt">single-pass</span> second-harmonic generation (SHG) in 4-{mu}m -period 0.5-mm-thick backswitch-poled lithium niobate. Pump sources at 920{endash}930thinspthinspnm include both Ti:sapphire and diode-oscillator{endash}amplifier lasers. SHG of a Ti:sapphire laser at 6.1{percent}/W efficiency, producing 61thinspthinspmW of power at 460thinspthinspnm, is demonstrated in 50-mm-long periodically poled lithium niobate samples with a nonlinear coefficient d{sub eff}{approx}9 pm/V , and 60thinspthinspmW at 465thinspthinspnm and 2.8{percent}/W efficiency is obtained by SHG of a laser-diode source. {copyright} {ital 1999} {ital Optical Society of America}</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012atph.book..347H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012atph.book..347H"><span id="translatedtitle">Cloud and Precipitation <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hagen, Martin; Höller, Hartmut; Schmidt, Kersten</p> <p></p> <p>Precipitation or weather <span class="hlt">radar</span> is an essential tool for research, diagnosis, and nowcasting of precipitation events like fronts or thunderstorms. Only with weather <span class="hlt">radar</span> is it possible to gain insights into the three-dimensional structure of thunderstorms and to investigate processes like hail formation or tornado genesis. A number of different <span class="hlt">radar</span> products are available to analyze the structure, dynamics and microphysics of precipitation systems. Cloud <span class="hlt">radars</span> use short wavelengths to enable detection of small ice particles or cloud droplets. Their applications differ from weather <span class="hlt">radar</span> as they are mostly orientated vertically, where different retrieval techniques can be applied.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19950016672','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19950016672"><span id="translatedtitle">Stellar <span class="hlt">Interferometer</span> Technology Experiment (SITE)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Crawley, Edward F.; Miller, David; Laskin, Robert; Shao, Michael</p> <p>1995-01-01</p> <p>The MIT Space Engineering Research Center and the Jet Propulsion Laboratory stand ready to advance science sensor technology for discrete-aperture astronomical instruments such as space-based optical <span class="hlt">interferometers</span>. The objective of the Stellar <span class="hlt">Interferometer</span> Technology Experiment (SITE) is to demonstrate system-level functionality of a space-based stellar <span class="hlt">interferometer</span> through the use of enabling and enhancing Controlled-Structures Technologies (CST). SITE mounts to the Mission Peculiar Experiment Support System inside the Shuttle payload bay. Starlight, entering through two apertures, is steered to a combining plate where it is interferred. Interference requires 27 nanometer pathlength (phasing) and 0.29 archsecond wavefront-tilt (pointing) control. The resulting 15 milli-archsecond angular resolution exceeds that of current earth-orbiting telescopes while maintaining low cost by exploiting active optics and structural control technologies. With these technologies, unforeseen and time-varying disturbances can be rejected while relaxing reliance on ground alignment and calibration. SITE will reduce the risk and cost of advanced optical space systems by validating critical technologies in their operational environment. Moreover, these technologies are directly applicable to commercially driven applications such as precision matching, optical scanning, and vibration and noise control systems for the aerospace, medical, and automotive sectors. The SITE team consists of experienced university, government, and industry researchers, scientists, and engineers with extensive expertise in optical interferometry, nano-precision opto-mechanical control and spaceflight experimentation. The experience exists and the technology is mature. SITE will validate these technologies on a functioning <span class="hlt">interferometer</span> science sensor in order to confirm definitely their readiness to be baselined for future science missions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19840012737','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19840012737"><span id="translatedtitle">Polarized-<span class="hlt">interferometer</span> feasibility study</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Raab, F. H.</p> <p>1983-01-01</p> <p>The feasibility of using a polarized-<span class="hlt">interferometer</span> system as a rendezvous and docking sensor for two cooperating spacecraft was studied. The polarized <span class="hlt">interferometer</span> is a radio frequency system for long range, real time determination of relative position and attitude. Range is determined by round trip signal timing. Direction is determined by radio interferometry. Relative roll is determined from signal polarization. Each spacecraft is equipped with a transponder and an antenna array. The antenna arrays consist of four crossed dipoles that can transmit or receive either circularly or linearly polarized signals. The active spacecraft is equipped with a sophisticated transponder and makes all measurements. The transponder on the passive spacecraft is a relatively simple repeater. An initialization algorithm is developed to estimate position and attitude without any a priori information. A tracking algorithm based upon minimum variance linear estimators is also developed. Techniques to simplify the transponder on the passive spacecraft are investigated and a suitable configuration is determined. A multiple carrier CW signal format is selected. The dependence of range accuracy and ambiguity resolution error probability are derived and used to design a candidate system. The validity of the design and the feasibility of the polarized <span class="hlt">interferometer</span> concept are verified by simulation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22403429','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22403429"><span id="translatedtitle">The effect of rotations on Michelson <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Maraner, Paolo</p> <p>2014-11-15</p> <p>In the contest of the special theory of relativity, it is shown that uniform rotations induce a phase shift in Michelson <span class="hlt">interferometers</span>. The effect is second order in the ratio of the <span class="hlt">interferometer’s</span> speed to the speed of light, further suppressed by the ratio of the <span class="hlt">interferometer’s</span> arms length to the radius of rotation and depends on the <span class="hlt">interferometer’s</span> position in the co-rotating frame. The magnitude of the phase shift is just beyond the sensitivity of turntable rotated optical resonators used in present tests of Lorentz invariance. It grows significantly large in Earth’s rotated kilometer-scale Fabry–Perot enhanced interferometric gravitational-wave detectors where it appears as a constant bias. The effect can provide the means of sensing center and radius of rotations. - Highlights: • Rotations induce a phase shift in Michelson <span class="hlt">interferometers</span>. • Earth’s rotation induces a constant bias in Michelson <span class="hlt">interferometers</span>. • Michelson <span class="hlt">interferometers</span> can be used to sense center and radius of rotations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340240p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340240p/"><span id="translatedtitle">2. VIEW SOUTHWEST, prime search <span class="hlt">radar</span> tower, height finder <span class="hlt">radar</span> ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>2. VIEW SOUTHWEST, prime search <span class="hlt">radar</span> tower, height finder <span class="hlt">radar</span> towards, height finder <span class="hlt">radar</span> towers, and <span class="hlt">radar</span> tower (unknown function) - Fort Custer Military Reservation, P-67 <span class="hlt">Radar</span> Station, .25 mile north of Dickman Road, east of Clark Road, Battle Creek, Calhoun County, MI</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1185636','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/1185636"><span id="translatedtitle">Nonlocal polarization <span class="hlt">interferometer</span> for entanglement detection</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Williams, Brian P; Humble, Travis S; Grice, Warren P</p> <p>2014-01-01</p> <p>We report a nonlocal <span class="hlt">interferometer</span> capable of detecting entanglement and identifying Bell states statistically. This is possible due to the <span class="hlt">interferometer</span>'s unique correlation dependence on the antidiagonal elements of the density matrix, which have distinct bounds for separable states and unique values for the four Bell states. The <span class="hlt">interferometer</span> consists of two spatially separated balanced Mach-Zehnder or Sagnac <span class="hlt">interferometers</span> that share a polarization-entangled source. Correlations between these <span class="hlt">interferometers</span> exhibit nonlocal interference, while single-photon interference is suppressed. This <span class="hlt">interferometer</span> also allows for a unique version of the Clauser-Horne-Shimony-Holt Bell test where the local reality is the photon polarization. We present the relevant theory and experimental results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.csc.villanova.edu/~mdamian/Past/csc3990fa08/csrs2008/02-csrs2008-JosephCharpentier.pdf','EPRINT'); return false;" href="http://www.csc.villanova.edu/~mdamian/Past/csc3990fa08/csrs2008/02-csrs2008-JosephCharpentier.pdf"><span id="translatedtitle"><span class="hlt">Radar</span> Imaging Systems Joseph Charpentier</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p><span class="hlt">Radar</span> Imaging Systems Joseph Charpentier Department of Computing Sciences Villanova University types of <span class="hlt">radar</span> imaging systems; synthetic aperture <span class="hlt">radar</span> (SAR), through-the-wall <span class="hlt">radar</span>, and digital holographic near field <span class="hlt">radar</span>. Each system surveyed experiments that improved the quality of the resulting</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0808.1999v1','EPRINT'); return false;" href="http://arxiv.org/pdf/0808.1999v1"><span id="translatedtitle">Decoherence measure by gravitational wave <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Yasushi Mino</p> <p>2008-08-14</p> <p>We consider the possibility to measure the quantum decoherence using gravitational wave <span class="hlt">interferometers</span>. Gravitational wave <span class="hlt">interferometers</span> create the superposition state of photons and measure the interference of the photon state. If the decoherence occurs, the interference of the photon state vanishes and it can be measured by the <span class="hlt">interferometers</span>. As examples of decoherence mechanisms, we consider 1) decoherence by spontaneous localization, 2) gravitational decoherence and 3) decoherence by extra-dimensional gravity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0904.3617v2','EPRINT'); return false;" href="http://arxiv.org/pdf/0904.3617v2"><span id="translatedtitle">Entanglement assisted spin-wave atom <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Yu-Ao Chen; Xiao-Hui Bao; Zhen-Sheng Yuan; Shuai Chen; Bo Zhao; Jian-Wei Pan</p> <p>2009-10-15</p> <p>We report the observation of phase-super resolution in a motion-sensitive spin-wave (SW) atom <span class="hlt">interferometer</span> utilizing a NOON-type entanged state. The SW <span class="hlt">interferometer</span> is implemented by generating a superposition of two SWs and observing the interference between them, where the interference fringe is sensitive to the atomic collective motion. By heralded generation of a second order NOON state in the SW <span class="hlt">interferometer</span>, we clearly observe the interference pattern with phase super-resolution. The demonstrated SW <span class="hlt">interferometer</span> can in principle be scaled up to highly entangled quantum state, and thus is of fundamental importance to implement quantum-enhanced-measurement.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/nd0078.photos.199422p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/nd0078.photos.199422p/"><span id="translatedtitle">30. Perimeter acquisition <span class="hlt">radar</span> building room #318, showing <span class="hlt">radar</span> control. ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>30. Perimeter acquisition <span class="hlt">radar</span> building room #318, showing <span class="hlt">radar</span> control. Console and line printers - Stanley R. Mickelsen Safeguard Complex, Perimeter Acquisition <span class="hlt">Radar</span> Building, Limited Access Area, between Limited Access Patrol Road & Service Road A, Nekoma, Cavalier County, ND</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340241p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340241p/"><span id="translatedtitle">3. VIEW NORTHWEST, height finder <span class="hlt">radar</span> towers, and <span class="hlt">radar</span> tower ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>3. VIEW NORTHWEST, height finder <span class="hlt">radar</span> towers, and <span class="hlt">radar</span> tower (unknown function) - Fort Custer Military Reservation, P-67 <span class="hlt">Radar</span> Station, .25 mile north of Dickman Road, east of Clark Road, Battle Creek, Calhoun County, MI</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19720016521','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19720016521"><span id="translatedtitle">Apollo experience report: Lunar module landing <span class="hlt">radar</span> and rendezvous <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Rozas, P.; Cunningham, A. R.</p> <p>1972-01-01</p> <p>A developmental history of the Apollo lunar module landing and rendezvous <span class="hlt">radar</span> subsystems is presented. The Apollo <span class="hlt">radar</span> subsystems are discussed from initial concept planning to flight configuration testing. The major <span class="hlt">radar</span> subsystem accomplishments and problems are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21443428','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21443428"><span id="translatedtitle">Ordinary SQUID <span class="hlt">interferometers</span> and superfluid helium matter wave <span class="hlt">interferometers</span>: The role of quantum fluctuations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Golovashkin, A. I.; Zherikhina, L. N. Tskhovrebov, A. M.; Izmailov, G. N.; Ozolin, V. V.</p> <p>2010-08-15</p> <p>When comparing the operation of a superfluid helium matter wave quantum <span class="hlt">interferometer</span> (He SQUID) with that of an ordinary direct-current quantum <span class="hlt">interferometer</span> (dc SQUID), we estimate their resolution limitation that correspond to quantum fluctuations. An alternative mode of operation of the <span class="hlt">interferometer</span> as a unified macroquantum system is considered.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19820003099','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19820003099"><span id="translatedtitle">Planetary <span class="hlt">radar</span> studies</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Thompson, T. W.; Cutts, J. A.</p> <p>1981-01-01</p> <p>A catalog of lunar and <span class="hlt">radar</span> anomalies was generated to provide a base for comparison with Venusian <span class="hlt">radar</span> signatures. The relationships between lunar <span class="hlt">radar</span> anomalies and regolith processes were investigated, and a consortium was formed to compare lunar and Venusian <span class="hlt">radar</span> images of craters. Time was scheduled at the Arecibo Observatory to use the 430 MHz <span class="hlt">radar</span> to obtain high resolution <span class="hlt">radar</span> maps of six areas of the lunar suface. Data from 1978 observations of Mare Serenitas and Plato are being analyzed on a PDP 11/70 computer to construct the computer program library necessary for the eventual reduction of the May 1981 and subsequent data acquisitions. Papers accepted for publication are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/215465','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/215465"><span id="translatedtitle">Laser <span class="hlt">radar</span> in robotics</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Carmer, D.C.; Peterson, L.M.</p> <p>1996-02-01</p> <p>In this paper the authors describe the basic operating principles of laser <span class="hlt">radar</span> sensors and the typical algorithms used to process laser <span class="hlt">radar</span> imagery for robotic applications. The authors review 12 laser <span class="hlt">radar</span> sensors to illustrate the variety of systems that have been applied to robotic applications wherein information extracted from the laser <span class="hlt">radar</span> data is used to automatically control a mechanism or process. Next, they describe selected robotic applications in seven areas: autonomous vehicle navigation, walking machine foot placement, automated service vehicles, manufacturing and inspection, automotive, military, and agriculture. They conclude with a discussion of the status of laser <span class="hlt">radar</span> technology and suggest trends seen in the application of laser <span class="hlt">radar</span> sensors to robotics. Many new applications are expected as the maturity level progresses and system costs are reduced.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1983RvGSP..21..186O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1983RvGSP..21..186O"><span id="translatedtitle">Planetary <span class="hlt">radar</span> astronomy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ostro, S. J.</p> <p>1983-03-01</p> <p>The present investigation is concerned with planetary <span class="hlt">radar</span> research reported during the time from 1979 to 1982. A brief synopsis of <span class="hlt">radar</span> definitions and technical terminology is also provided. In connection with the proximity of the moon to earth, lunar <span class="hlt">radar</span> studies have been performed over a wider range of wavelengths than <span class="hlt">radar</span> investigations of other planetary targets. The most recent study of lunar quasispecular scattering is due to Simpson and Tyler (1982). The latest efforts to interpret the lunar <span class="hlt">radar</span> maps focus on maria-highlands regolith differences and models of crater ejecta evolution. The highly successful Pioneer Venus <span class="hlt">Radar</span> Mapper experiment has provided a first look at Venus' global distributions of topography, lambda 17-cm <span class="hlt">radar</span> reflectivity, and rms surface slopes. Attention is given to recent comparisons of Viking Orbiter images of Mars to groundbased <span class="hlt">radar</span> altimetry of the planet, the icy Galilean satellites, <span class="hlt">radar</span> observations of asteroids and comets, and lambda 4-cm and lambda 13-cm observations of Saturn's rings.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_7 --> <div id="page_8" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="141"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1113735','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1113735"><span id="translatedtitle"><span class="hlt">Single</span> <span class="hlt">Pass</span> Electron Cooling Simulations for MEIC</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bell, G. I.; Pogorelov, I. V.; Schwartz, B. T.; Zhang, Yuhong; Zhang, He</p> <p>2013-12-01</p> <p>Cooling of medium energy protons is critical for the proposed Jefferson Lab Medium Energy Ion Collider (MEIC). We present simulations of electron cooling of protons up to 60 GeV. In the beam frame in which the proton and electrons are co-propagating, their motion is non-relativistic. We use a binary collision model which treats the cooling process as the sum of a large number of two-body collisions which are calculated exactly. This model can treat even very close collisions between an electron and ion with high accuracy. We also calculate dynamical friction using a delta-f PIC model. The code VSim (formerly Vorpal) is used to perform the simulations. We compare the friction rates with that obtained by a 3D integral over electron velocities which is used by BETACOOL.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014RScI...85h6102Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014RScI...85h6102Z"><span id="translatedtitle">Note: Periodic error measurement in heterodyne <span class="hlt">interferometers</span> using a subpicometer accuracy Fabry-Perot <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhu, Minhao; Wei, Haoyun; Wu, Xuejian; Li, Yan</p> <p>2014-08-01</p> <p>Periodic error is the major problem that limits the accuracy of heterodyne interferometry. A traceable system for periodic error measurement is developed based on a nonlinearity free Fabry-Perot (F-P) <span class="hlt">interferometer</span>. The displacement accuracy of the F-P <span class="hlt">interferometer</span> is 0.49 pm at 80 ms averaging time, with the measurement results referenced to an optical frequency comb. Experimental comparison between the F-P <span class="hlt">interferometer</span> and a commercial heterodyne <span class="hlt">interferometer</span> is carried out and it shows that the first harmonic periodic error dominates in the commercial heterodyne <span class="hlt">interferometer</span> with an error amplitude of 4.64 nm.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20653107','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20653107"><span id="translatedtitle">The DELTA Synchrotron Light <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Berges, U.</p> <p>2004-05-12</p> <p>Synchrotron radiation sources like DELTA, the Dortmund Electron Accelerator, a third generation synchrotron light source, need an optical monitoring system to measure the beam size at different points of the ring with high resolution and accuracy. These measurements also allow an investigation of the emittance of the storage ring, an important working parameter for the efficiency of working beamlines with experiments using the synchrotron radiation. The resolution limits of the different types of optical synchrotron light monitors at DELTA are investigated. The minimum measurable beamsize with the normal synchrotron light monitor using visible light at DELTA is about 80 {mu}m. Due to this a synchrotron light <span class="hlt">interferometer</span> was built up and tested at DELTA. The <span class="hlt">interferometer</span> uses the same beamline in the visible range. The minimum measurable beamsize is with about 8 {mu}m one order of magnitude smaller. This resolution is sufficient for the expected small vertical beamsizes at DELTA. The electron beamsize and emittance were measured with both systems at different electron beam energies of the storage ring. The theoretical values of the present optics are smaller than the measured emittance. So possible reasons for beam movements are investigated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cvml.unige.ch/publications/postscript/2001/GeneralizedRadarRadiometryImagingProblems.pdf','EPRINT'); return false;" href="http://cvml.unige.ch/publications/postscript/2001/GeneralizedRadarRadiometryImagingProblems.pdf"><span id="translatedtitle">Generalized <span class="hlt">radar</span>/radiometry imaging problems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Paper Generalized <span class="hlt">radar</span>/radiometry imaging problems Ivan Prudyus, Sviatoslav Voloshynovskiy, Andriy- ing simulation based on <span class="hlt">radar</span>, synthetic aperture <span class="hlt">radar</span> (SAR) and radiometry systems are presented systems, synthetic aperture <span class="hlt">radar</span>, spatio-temporal imaging. 1. Introduction Resolution of <span class="hlt">radar</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21175912','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21175912"><span id="translatedtitle">Dual-prism <span class="hlt">interferometer</span> for collimation testing</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hii, King Ung; Kwek, Kuan Hiang</p> <p>2009-01-10</p> <p>An air-wedge lateral-shear <span class="hlt">interferometer</span> using two prisms is presented. With a variable shear, the <span class="hlt">interferometer</span> is suitable for testing collimation of a wide range of beam sizes down to a few millimeters in diameter. No antireflection coatings are necessary. Collimation for a light source with short coherent length is also demonstrated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/67754','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/67754"><span id="translatedtitle">CIST....CORRTEX <span class="hlt">interferometer</span> simulation test</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Heinle, R.A.</p> <p>1994-12-01</p> <p>Testing was performed in order to validate and cross calibrate an RF <span class="hlt">interferometer</span> and the crush threshold of cable. Nitromethane was exploded (inside of PVC pipe). The explosion was used to crush the <span class="hlt">interferometer</span> sensor cables which had been placed inside and outside the pipe. Results are described.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.atomwave.org/otherarticles/greenbergthesis.pdf','EPRINT'); return false;" href="http://www.atomwave.org/otherarticles/greenbergthesis.pdf"><span id="translatedtitle">AN ATOM <span class="hlt">INTERFEROMETER</span> GYROSCOPE JAMES GREENBERG</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Cronin, Alex D.</p> <p></p> <p>AN ATOM <span class="hlt">INTERFEROMETER</span> GYROSCOPE By JAMES GREENBERG A Thesis Submitted to the Honors College gyroscope that is sensitive to the abso- lute rotation rate of the lab with respect to an inertial frame. We accelerations of ±0.005g and absolute rotation rates of ±0.5E. Sensitive atom <span class="hlt">interferometer</span> gyroscopes</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0909.3661v3','EPRINT'); return false;" href="http://arxiv.org/pdf/0909.3661v3"><span id="translatedtitle"><span class="hlt">Interferometer</span> Techniques for Gravitational-Wave Detection</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Charlotte Bond; Daniel Brown; Andreas Freise; Kenneth Strain</p> <p>2015-12-04</p> <p>Several km-scale gravitational-wave detectors have been constructed world wide. These instruments combine a number of advanced technologies to push the limits of precision length measurement. The core devices are laser <span class="hlt">interferometers</span> of a new kind; developed from the classical Michelson topology these <span class="hlt">interferometers</span> integrate additional optical elements, which significantly change the properties of the optical system. Much of the design and analysis of these laser <span class="hlt">interferometers</span> can be performed using well-known classical optical techniques; however, the complex optical layouts provide a new challenge. In this review we give a textbook-style introduction to the optical science required for the understanding of modern gravitational wave detectors, as well as other high-precision laser <span class="hlt">interferometers</span>. In addition, we provide a number of examples for a freely available <span class="hlt">interferometer</span> simulation software and encourage the reader to use these examples to gain hands-on experience with the discussed optical methods.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21408293','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21408293"><span id="translatedtitle">Orientational atom <span class="hlt">interferometers</span> sensitive to gravitational waves</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lorek, Dennis; Laemmerzahl, Claus; Wicht, Andreas</p> <p>2010-02-15</p> <p>We present an atom <span class="hlt">interferometer</span> that differs from common atom <span class="hlt">interferometers</span> as it is not based on the spatial splitting of electronic wave functions, but on orienting atoms in space. As an example we present how an orientational atom <span class="hlt">interferometer</span> based on highly charged hydrogen-like atoms is affected by gravitational waves. We show that a monochromatic gravitational wave will cause a frequency shift that scales with the binding energy of the system rather than with its physical dimension. For a gravitational wave amplitude of h=10{sup -23} the frequency shift is of the order of 110 {mu}Hz for an atom <span class="hlt">interferometer</span> based on a 91-fold charged uranium ion. A frequency difference of this size can be resolved by current atom <span class="hlt">interferometers</span> in 1 s.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1980RaEE...50..611S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1980RaEE...50..611S"><span id="translatedtitle">Remote sensing of the sea-surface by dekametric <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shearman, E. D. R.</p> <p>1980-12-01</p> <p>The use of shore-based dekametric-wave <span class="hlt">radar</span> in the remote sensing of ocean wave energy and surface currents is discussed. The evolution of dekametric <span class="hlt">radar</span> remote sensing of the sea surface is traced from the original observation of Bragg resonant scattering by Crombie (1955) to its present applications in measurements of surface wind direction and speed, wave-height and direction spectra and surface currents, with emphasis placed on the role of the Doppler spectrum of the <span class="hlt">radar</span> echoes. The generation and spectral properties of wind-driven waves and swell on the sea surface are discussed, and the scattering of dekametric radio waves by the sea is examined. Experimental and signal processing techniques used in ground-wave and sky-wave <span class="hlt">radar</span> surveys of the Celtic Sea and the Rockall Bank area of the North Atlantic respectively, are presented, and results of the experiments are indicated. Finally, work in progress on improved narrow-beam and <span class="hlt">interferometer</span> <span class="hlt">radars</span> and methods for Doppler spectrum inversion is reviewed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19770000045&hterms=subsurface+imaging&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dsubsurface%2Bimaging','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19770000045&hterms=subsurface+imaging&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dsubsurface%2Bimaging"><span id="translatedtitle">Subsurface "<span class="hlt">radar</span>" camera</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Jain, A.</p> <p>1977-01-01</p> <p>Long-wave length multiple-frequency <span class="hlt">radar</span> is used for imaging and determining depth of subsurface stratified layers. Very-low frequency <span class="hlt">radar</span> signals pinpoint below-ground strata via direct imagery techniques. Variation of frequency and scanning angle adjusts image depth and width.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19750008534','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19750008534"><span id="translatedtitle">Noncooperative rendezvous <span class="hlt">radar</span> system</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1974-01-01</p> <p>A fire control <span class="hlt">radar</span> system was developed, assembled, and modified. The baseline system and modified angle tracking system are described along with the performance characteristics of the baseline and modified systems. Proposed changes to provide additional techniques for <span class="hlt">radar</span> evaluation are presented along with flight test data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19870001058&hterms=environnement&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Denvironnement','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19870001058&hterms=environnement&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Denvironnement"><span id="translatedtitle">The PROUST <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bertin, F.; Glass, M.; Ney, R.; Petitdidier, M.</p> <p>1986-01-01</p> <p>The Stratosphere-Troposphere (ST) <span class="hlt">radar</span> called PROUST works at 935 MHz using the same klystron and antenna as the coherent-scatter <span class="hlt">radar</span>. The use of this equipment for ST work has required some important modifications of the transmitting system and the development of receiving, data processing and acquisition (1984,1985) equipment. The modifications are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110016436','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110016436"><span id="translatedtitle">Java <span class="hlt">Radar</span> Analysis Tool</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Zaczek, Mariusz P.</p> <p>2005-01-01</p> <p>Java <span class="hlt">Radar</span> Analysis Tool (JRAT) is a computer program for analyzing two-dimensional (2D) scatter plots derived from <span class="hlt">radar</span> returns showing pieces of the disintegrating Space Shuttle Columbia. JRAT can also be applied to similar plots representing <span class="hlt">radar</span> returns showing aviation accidents, and to scatter plots in general. The 2D scatter plots include overhead map views and side altitude views. The superposition of points in these views makes searching difficult. JRAT enables three-dimensional (3D) viewing: by use of a mouse and keyboard, the user can rotate to any desired viewing angle. The 3D view can include overlaid trajectories and search footprints to enhance situational awareness in searching for pieces. JRAT also enables playback: time-tagged <span class="hlt">radar</span>-return data can be displayed in time order and an animated 3D model can be moved through the scene to show the locations of the Columbia (or other vehicle) at the times of the corresponding <span class="hlt">radar</span> events. The combination of overlays and playback enables the user to correlate a <span class="hlt">radar</span> return with a position of the vehicle to determine whether the return is valid. JRAT can optionally filter single <span class="hlt">radar</span> returns, enabling the user to selectively hide or highlight a desired <span class="hlt">radar</span> return.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014cosp...40E3684Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014cosp...40E3684Y"><span id="translatedtitle">Equatorial MU <span class="hlt">Radar</span> project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yamamoto, Mamoru; Hashiguchi, H.; Tsuda, Toshitaka; Yamamoto, Masayuki</p> <p></p> <p>Research Institute for Sustainable Humanosphere, Kyoto University (RISH) has been studying the atmosphere by using <span class="hlt">radars</span>. The first big facility was the MU (Middle and Upper atmosphere) <span class="hlt">radar</span> installed in Shiga, Japan in 1984. This is one of the most powerful and multi-functional <span class="hlt">radar</span>, and is successful of revealing importance of atmospheric waves for the dynamical vertical coupling processes. The next big <span class="hlt">radar</span> was the Equatorial Atmosphere <span class="hlt">Radar</span> (EAR) installed at Kototabang, West Sumatra, Indonesia in 2001. The EAR was operated under close collaboration with LAPAN (Indonesia National Institute for Aeronautics and Space), and conducted the long-term continuous observations of the equatorial atmosphere/ionosphere for more than 10 years. The MU <span class="hlt">radar</span> and the EAR are both utilized for inter-university and international collaborative research program for long time. National Institute for Polar Research (NIPR) joined EISCAT Scientific Association together with Nagoya University, and developed the PANSY <span class="hlt">radar</span> at Syowa base in Antarctica as a joint project with University of Tokyo. These are the efforts of <span class="hlt">radar</span> study of the atmosphere/ionosphere in the polar region. Now we can find that Japan holds a global network of big atmospheric/ionospheric <span class="hlt">radars</span>. The EAR has the limitation of lower sensitivity compared with the other big <span class="hlt">radars</span> shown above. RISH now proposes a plan of Equatorial MU <span class="hlt">Radar</span> (EMU) that is to establish the MU-<span class="hlt">radar</span> class <span class="hlt">radar</span> next to the EAR. The EMU will have an active phased array antenna with the 163m diameter and 1055 cross-element Yagis. Total output power of the EMU will be more than 500kW. The EMU can detect turbulent echoes from the mesosphere (60-80km). In the ionosphere incoherent-scatter observations of plasma density, drift, and temperature would be possible. Multi-channel receivers will realize <span class="hlt">radar</span>-imaging observations. The EMU is one of the key facilities in the project "Study of coupling processes in the solar-terrestrial system" for Master Plan 2014 of the Science Council of Japan (SCJ). We show the EMU project and its science in the presentation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20000075269&hterms=sars&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dsars','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20000075269&hterms=sars&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dsars"><span id="translatedtitle">GeoSAR: A <span class="hlt">Radar</span> Terrain Mapping System for the New Millennium</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Thompson, Thomas; vanZyl, Jakob; Hensley, Scott; Reis, James; Munjy, Riadh; Burton, John; Yoha, Robert</p> <p>2000-01-01</p> <p>GeoSAR Geographic Synthetic Aperture <span class="hlt">Radar</span>) is a new 3 year effort to build a unique, dual-frequency, airborne Interferometric SAR for mapping of terrain. This is being pursued via a Consortium of the Jet Propulsion Laboratory (JPL), Calgis, Inc., and the California Department of Conservation. The airborne portion of this system will operate on a Calgis Gulfstream-II aircraft outfitted with P- and X-band Interferometric SARs. The ground portions of this system will be a suite of Flight Planning Software, an IFSAR Processor and a <span class="hlt">Radar</span>-GIS Workstation. The airborne P-band and X-band <span class="hlt">radars</span> will be constructed by JPL with the goal of obtaining foliage penetration at the longer P-band wavelengths. The P-band and X-band <span class="hlt">radar</span> will operate at frequencies of 350 Mhz and 9.71 Ghz with bandwidths of either 80 or 160 Mhz. The airborne <span class="hlt">radars</span> will be complemented with airborne laser system for measuring antenna positions. Aircraft flight lines and <span class="hlt">radar</span> operating instructions will be computed with the Flight Planning Software The ground processing will be a two-step step process. First, the raw <span class="hlt">radar</span> data will be processed into <span class="hlt">radar</span> images and <span class="hlt">interferometer</span> derived Digital Elevation Models (DEMs). Second, these <span class="hlt">radar</span> images and DEMs will be processed with a <span class="hlt">Radar</span> GIS Workstation which performs processes such as Projection Transformations, Registration, Geometric Adjustment, Mosaicking, Merging and Database Management. JPL will construct the IFSAR Processor and Calgis, Inc. will construct the <span class="hlt">Radar</span> GIS Workstation. The GeoSAR Project was underway in November 1996 with a goal of having the <span class="hlt">radars</span> and laser systems fully integrated onto the Calgis Gulfstream-II aircraft in early 1999. Then, Engineering Checkout and Calibration-Characterization Flights will be conducted through November 1999. The system will be completed at the end of 1999 and ready for routine operations in the year 2000.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340243p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340243p/"><span id="translatedtitle">5. VIEW EAST, height finder <span class="hlt">radar</span> towers, <span class="hlt">radar</span> tower (unknown ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>5. VIEW EAST, height finder <span class="hlt">radar</span> towers, <span class="hlt">radar</span> tower (unknown function), prime search <span class="hlt">radar</span> tower, operations building, and central heating plant - Fort Custer Military Reservation, P-67 <span class="hlt">Radar</span> Station, .25 mile north of Dickman Road, east of Clark Road, Battle Creek, Calhoun County, MI</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.latp.univ-mrs.fr/~preaux/PDF/IEEE_raout_preaux.pdf','EPRINT'); return false;" href="http://www.latp.univ-mrs.fr/~preaux/PDF/IEEE_raout_preaux.pdf"><span id="translatedtitle">Browse > Conferences> <span class="hlt">Radar</span> Conference, 2008. <span class="hlt">RADAR</span> ... INDEX TERMS</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Préaux, Jean-Philippe</p> <p></p> <p>Browse > Conferences> <span class="hlt">Radar</span> Conference, 2008. <span class="hlt">RADAR</span> ... INDEX TERMS REFERENCES CITING DOCUMENTS Force, MorphoAnalysis in Signal Process. Lab., Salon-de-Provence This paper appears in: <span class="hlt">Radar</span> Conference, 2008. <span class="hlt">RADAR</span> '08. IEEE Issue Date: 26-30 May 2008 On page(s): 1 - 5 Location: Rome ISSN: 1097-5659 Print</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340242p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/mi0425.photos.340242p/"><span id="translatedtitle">4. VIEW NORTHEAST, <span class="hlt">radar</span> tower (unknown function), prime search <span class="hlt">radar</span> ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>4. VIEW NORTHEAST, <span class="hlt">radar</span> tower (unknown function), prime search <span class="hlt">radar</span> tower, emergency power building, and height finder <span class="hlt">radar</span> tower - Fort Custer Military Reservation, P-67 <span class="hlt">Radar</span> Station, .25 mile north of Dickman Road, east of Clark Road, Battle Creek, Calhoun County, MI</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19920062556&hterms=extra+solar+planets&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dextra%2Bsolar%2Bplanets','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920062556&hterms=extra+solar+planets&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dextra%2Bsolar%2Bplanets"><span id="translatedtitle">Hubble Extra Solar Planet <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shao, M.</p> <p>1991-01-01</p> <p>This paper describes a proposed third-generation Hubble instrument for extra-solar planet detection, the Hubble Extra-Solar Planet <span class="hlt">Interferometer</span> (HESPI). This instrument would be able to achieve starlight cancellation at the 10 exp 6 to 10 exp 8 level, given a stellar wavefront with phase errors comparable to the present Hubble telescope wavefront. At 10 exp 6 starlight cancellation, HESPI would be able to detect a Jupiter-like planet next to a star at a distance of about 10 parsec, for which there are about 400 candidate stars. This paper describes a novel approach for starlight suppression, using a combination of active control and single-mode spatial filters, to achieve starlight suppression far below the classical limit set by scattering due to microsurface imperfections. In preliminary lab experiments, suppression by a factor of 40 below the classical scatter limit due to optical wavefront errors has been demonstrated.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_8 --> <div id="page_9" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="161"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012SPIE.8445E..3HR','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012SPIE.8445E..3HR"><span id="translatedtitle">Navy precision optical <span class="hlt">interferometer</span> database</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ryan, K. K.; Jorgensen, A. M.; Hall, T.; Armstrong, J. T.; Hutter, D.; Mozurkewich, D.</p> <p>2012-07-01</p> <p>The Navy Precision Optical <span class="hlt">Interferometer</span> (NPOI) has now been recording astronomical observations for the better part of two decades. During that time period hundreds of thousands of observations have been obtained, with a total data volume of multiple terabytes. Additionally, in the next few years the data rate from the NPOI is expected to increase significantly. To make it easier for NPOI users to search the NPOI observations and to make it easier for them to obtain data, we have constructed a easily accessible and searchable database of observations. The database is based on a MySQL server and uses standard query language (SQL). In this paper we will describe the database table layout and show examples of possible database queries.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/6252280','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/6252280"><span id="translatedtitle">Beam shuttering <span class="hlt">interferometer</span> and method</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Deason, V.A.; Lassahn, G.D.</p> <p>1993-07-27</p> <p>A method and apparatus resulting in the simplification of phase shifting interferometry by eliminating the requirement to know the phase shift between interferograms or to keep the phase shift between interferograms constant. The present invention provides a simple, inexpensive means to shutter each independent beam of the <span class="hlt">interferometer</span> in order to facilitate the data acquisition requirements for optical interferometry and phase shifting interferometry. By eliminating the requirement to know the phase shift between interferograms or to keep the phase shift constant, a simple, economical means and apparatus for performing the technique of phase shifting interferometry is provide which, by thermally expanding a fiber optical cable changes the optical path distance of one incident beam relative to another.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/985339','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/985339"><span id="translatedtitle">X-ray shearing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Koch, Jeffrey A. (Livermore, CA)</p> <p>2003-07-08</p> <p>An x-ray <span class="hlt">interferometer</span> for analyzing high density plasmas and optically opaque materials includes a point-like x-ray source for providing a broadband x-ray source. The x-rays are directed through a target material and then are reflected by a high-quality ellipsoidally-bent imaging crystal to a diffraction grating disposed at 1.times. magnification. A spherically-bent imaging crystal is employed when the x-rays that are incident on the crystal surface are normal to that surface. The diffraction grating produces multiple beams which interfere with one another to produce an interference pattern which contains information about the target. A detector is disposed at the position of the image of the target produced by the interfering beams.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=218762','TEKTRAN'); return false;" href="http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=218762"><span id="translatedtitle">Ground-penetrating <span class="hlt">radar</span> methods</span></a></p> <p><a target="_blank" href="http://www.ars.usda.gov/services/TekTran.htm">Technology Transfer Automated Retrieval System (TEKTRAN)</a></p> <p></p> <p></p> <p>Ground-penetrating <span class="hlt">radar</span> geophysical methods are finding greater and greater use in agriculture. With the ground-penetrating <span class="hlt">radar</span> (GPR) method, an electromagnetic radio energy (<span class="hlt">radar</span>) pulse is directed into the subsurface, followed by measurement of the elapsed time taken by the <span class="hlt">radar</span> signal as it ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/929633','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/929633"><span id="translatedtitle">Interlaboratory study of the reproducibility of the <span class="hlt">single-pass</span> flow-through test method : measuring the dissolution rate of LRM glass at 70 {sup {degree}}C and pH 10.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Ebert, W. L.; Chemical Engineering</p> <p>2006-02-28</p> <p>An international interlaboratory study (ILS) was conducted to evaluate the precision with which <span class="hlt">single-pass</span> flow-through (SPFT) tests can be conducted by following a method to be standardized by the American Society for Testing and Materials - International. Tests for the ILS were conducted with the low-activity reference material (LRM) glass developed previously for use as a glass test standard. Tests were conducted at 70 {+-} 2 C using a LiCl/LiOH solution as the leachant to impose an initial pH of about 10 (at 70 C). Participants were provided with LRM glass that had been crushed and sieved to isolate the -100 +200 mesh size fraction, and then washed to remove fines. Participants were asked to conduct a series of tests using different solution flow rate-to-sample mass ratios to generate a range of steady-state Si concentrations. The glass dissolution rate under each test condition was calculated using the steady-state Si concentration and solution flow rate that were measured in the test. The glass surface area was estimated from the mass of glass used in the test and the Si content of LRM glass was known. A linear relationship between the rate and the steady-state Si concentration (at Si concentrations less than 10 mg/L) was used to estimate the forward dissolution rate, which is the rate in the absence of dissolved Si. Participants were asked to sample the effluent solution at least five times after reaction times of between 3 and 14 days to measure the Si concentration and flow rate, and to verify that steady-state was achieved. Results were provided by seven participants and the data sets provided by five participants were sufficient to determine the forward rates independently.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19780025753','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19780025753"><span id="translatedtitle">GEOS-3 ocean current investigation using <span class="hlt">radar</span> altimeter profiling. [Gulf Stream surface topography</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Leitao, C. D.; Huang, N. E.; Parra, C. G.</p> <p>1978-01-01</p> <p>Both quasi-stationary and dynamic departures from the marine geoid were successfully detected using altitude measurements from the GEOS-3 <span class="hlt">radar</span> altimeter. The quasi-stationary departures are observed either as elevation changes in <span class="hlt">single</span> <span class="hlt">pass</span> profiles across the Gulf Stream or at the crowding of contour lines at the western and northern areas of topographic maps generated using altimeter data spanning one month or longer. Dynamic features such as current meandering and spawned eddies can be monitored by comparing monthly mean maps. Comparison of altimeter inferred eddies with IR detected thermal rings indicates agreement of the two techniques. Estimates of current velocity are made using derived slope estimates in conjunction with the geostrophic equation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20653052','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20653052"><span id="translatedtitle">X-ray <span class="hlt">Interferometer</span> Using Prism Optics</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Suzuki, Yoshio</p> <p>2004-05-12</p> <p>Two-beam X-ray <span class="hlt">interferometer</span> using refractive optics has been developed. A prism made of acrylic resin is used as the beam deflector for hard X-ray wavefront dividing <span class="hlt">interferometer</span>. This configuration is the same as that of the Fresnel's bi-prism <span class="hlt">interferometer</span> or the Leith-Upatnieks type two-beam holography in visible light region. Therefore, quantitative analysis of the degree of transversal coherence can be performed by measuring the visibility of interference fringes. It is also possible to realize two-beam holographic imaging in hard X-ray regions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/12027177','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/12027177"><span id="translatedtitle">Dynamic models of Fabry-Perot <span class="hlt">interferometers</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Redding, David; Regehr, Martin; Sievers, Lisa</p> <p>2002-05-20</p> <p>Long-baseline, high-finesse Fabry-Perot <span class="hlt">interferometers</span> can be used to make distance measurements that are precise enough to detect gravity waves. This level of sensitivity is achieved in part when the <span class="hlt">interferometer</span> mirrors are isolated dynamically, with pendulum mounts and high-bandwidth cavity length control servos to reduce the effects of seismic noise. We present dynamical models of the cavity fields and signals of Fabry-Perot <span class="hlt">interferometers</span> for use in the design and evaluation of length control systems for gravity-wave detectors. Models are described and compared with experimental data. PMID:12027177</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20111497','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20111497"><span id="translatedtitle">Spaceborne laser <span class="hlt">radar</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Flom, T</p> <p>1972-02-01</p> <p>Laser <span class="hlt">radar</span> systems are being developed to acquire and track targets in applications such as the rendezvous and docking of two spacecraft. To search effectively for and locate a target using a narrow laser beam, a scanning system is needed. This paper describes a scan technique whereby a narrow laser beam is synchronously scanned with an equally narrow receiver field-of-view without the aid of mechanical gimbals. Equations are developed in order to examine the maximum acquisition and tracking rates, and the maximum target range for a scanning laser <span class="hlt">radar</span> system. A recently built prototype of a small, lightweight, low-power-consuming scanning laser <span class="hlt">radar</span> is described. PMID:20111497</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20120009289','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20120009289"><span id="translatedtitle">Comparative Sensitivities of Gravitational Wave Detectors Based on Atom <span class="hlt">Interferometers</span> and Light <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Baker, John G.; Thorpe, J. I.</p> <p>2012-01-01</p> <p>We consider a class of proposed gravitational wave detectors based on multiple atomic <span class="hlt">interferometers</span> separated by large baselines and referenced by common laser systems. We compute the sensitivity limits of these detectors due to intrinsic phase noise of the light sources, non-inertial motion of the light sources, and atomic shot noise and compare them to sensitivity limits for traditional light <span class="hlt">interferometers</span>. We find that atom <span class="hlt">interferometers</span> and light <span class="hlt">interferometers</span> are limited in a nearly identical way by intrinsic phase noise and that both require similar mitigation strategies (e.g. multiple arm instruments) to reach interesting sensitivities. The sensitivity limit from motion of the light sources is slightly different and favors the atom <span class="hlt">interferometers</span> in the low-frequency limit, although the limit in both cases is severe. Whether this potential advantage outweighs the additional complexity associated with including atom <span class="hlt">interferometers</span> will require further study.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://oaktrust.library.tamu.edu//handle/1969.1/ETD-TAMU-1993-THESIS-D666','EPRINT'); return false;" href="http://oaktrust.library.tamu.edu//handle/1969.1/ETD-TAMU-1993-THESIS-D666"><span id="translatedtitle">Temperature compensated two-mode fiber <span class="hlt">interferometer</span> </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Doma, Jagdish Ramchandra</p> <p>1993-01-01</p> <p>In this thesis we propose an innovative approach of designing and implementing a temperature compensated two-mode optical fiber <span class="hlt">interferometer</span> in a control system of stabilizing the wavelength of a laser. We give the procedure for designing...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://dspace.mit.edu/handle/1721.1/88408','EPRINT'); return false;" href="http://dspace.mit.edu/handle/1721.1/88408"><span id="translatedtitle">Active noise cancellation in a suspended <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Driggers, J.?C.</p> <p></p> <p>We demonstrate feed-forward vibration isolation on a suspended Fabry-Perot <span class="hlt">interferometer</span> using Wiener filtering and a variant of the common least mean square adaptive filter algorithm. We compare the experimental results ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20563099','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20563099"><span id="translatedtitle"><span class="hlt">Interferometers</span>: equivalent sine condition and pseudoholographic properties.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Simon, J M; Lemmi, C C</p> <p>1990-05-01</p> <p>We show experimentally how an <span class="hlt">interferometer</span>, which in its current use does not have pseudoholographic properties, acquires them when the working conditions lead to the nonfulfillment of the equivalent sine condition. PMID:20563099</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1987maa..agarQ....S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1987maa..agarQ....S"><span id="translatedtitle">Aircraft <span class="hlt">radar</span> antennas</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Schrank, Helmut E.</p> <p>1987-04-01</p> <p>Many changes have taken place in airborne <span class="hlt">radar</span> antennas since their beginnings over forty years ago. A brief historical review of the advances in technology is presented, from mechanically scanned reflectors to modern multiple function phased arrays. However, emphasis is not on history but on the state-of-the-art technology and trends for future airborne <span class="hlt">radar</span> systems. The status of rotating surveillance antennas is illustrated by the AN/APY-1 Airborne Warning and Control System (AWACS) slotted waveguide array, which achieved a significant breakthrough in sidelobe suppression. Gimballed flat plate arrays in nose radomes are typified by the AN/APG-66 (F-16) antenna. Multifunction phased arrays are presented by the Electronically Agile <span class="hlt">Radar</span> (EAR) antenna, which has achieved significant advances in performance versatility and reliability. Trends toward active aperture, adaptive, and digital beamforming arrays are briefly discussed. Antennas for future aircraft <span class="hlt">radar</span> systems must provide multiple functions in less aperture space, and must perform more reliably.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://dspace.mit.edu/handle/1721.1/58911','EPRINT'); return false;" href="http://dspace.mit.edu/handle/1721.1/58911"><span id="translatedtitle">GMTI MIMO <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Bliss, Daniel W., Jr.</p> <p></p> <p>Multiple-input multiple-output (MIMO) extensions to <span class="hlt">radar</span> systems enable a number of advantages compared to traditional approaches. These advantages include improved angle estimation and target detection. In this paper, ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/866890','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/866890"><span id="translatedtitle">Downhole pulse <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Chang, Hsi-Tien (Albuquerque, NM)</p> <p>1989-01-01</p> <p>A borehole logging tool generates a fast rise-time, short duration, high peak-power <span class="hlt">radar</span> pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. <span class="hlt">Radar</span> returns from geological discontinuities are sampled for transmission uphole.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/6866222','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/6866222"><span id="translatedtitle">Downhole pulse <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Chang, Hsi-Tien</p> <p>1987-09-28</p> <p>A borehole logging tool generates a fast rise-time, short duration, high peak-power <span class="hlt">radar</span> pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. <span class="hlt">Radar</span> returns from geological discontinuities are sampled for transmission uphole. 7 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19830013678','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19830013678"><span id="translatedtitle">Dual-beam skin friction <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Monson, D. J. (inventor)</p> <p>1981-01-01</p> <p>A portable dual-laser beam <span class="hlt">interferometer</span> is described that nonintrusively measures skin friction by monitoring the thickness change of an oil film at two locations while said oil film is subjected to shear stress. An <span class="hlt">interferometer</span> flat is utilized to develop the two beams. Light detectors sense the beam reflections from the oil film and the surface thereunder. The signals from the detectors are recorded so that the number of interference fringes produced over a given time span may be counted.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvA..92b2104L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvA..92b2104L"><span id="translatedtitle">Nonlinear Michelson <span class="hlt">interferometer</span> for improved quantum metrology</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Luis, Alfredo; Rivas, Ángel</p> <p>2015-08-01</p> <p>We examine quantum detection via a Michelson <span class="hlt">interferometer</span> embedded in a gas with Kerr nonlinearity. This nonlinear <span class="hlt">interferometer</span> is illuminated by pulses of classical light. This strategy combines the robustness against practical imperfections of classical light with the improvement provided by nonlinear processes. Regarding ultimate quantum limits, we stress that, as a difference with linear schemes, the nonlinearity introduces pulse duration as a new variable into play along with the energy resources.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000064076','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000064076"><span id="translatedtitle"><span class="hlt">Interferometer</span> Designs for the Terrestrial Planet Finder</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lawson, P. R.; Dumont, P. J.; Colavita, M. M.</p> <p>1999-01-01</p> <p>The Terrestrial Planet Finder (TPF) is a space-based infrared <span class="hlt">interferometer</span> that will combine high sensitivity and spatial resolution to detect and characterize planetary systems within 15 pc of our sun. TPF is a key element in NASA's Origins Program and is currently under study in its Pre-Project Phase. We review some of the <span class="hlt">interferometer</span> designs that have been considered for starlight nulling, with particular attention to the architecture and subsystems of the central beam-combiner.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_9 --> <div id="page_10" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="181"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20000057050','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20000057050"><span id="translatedtitle"><span class="hlt">Interferometer</span> Designs for the Terrestrial Planet Finder</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lawson, P. R.; Dumont, P. J.; Colavita, M. M.</p> <p>2000-01-01</p> <p>The Terrestrial Planet Finder (TPF) is a space-based infrared <span class="hlt">interferometer</span> that will combine high sensitivity and spatial resolution to detect and characterize planetary systems within 15 pc of our sun. TPF is a key element in NASA's Origins Program and is currently un- der study in its Pre-Project Phase. We review some of the <span class="hlt">interferometer</span> designs that have been considered for starlight nulling, with particular attention to the architecture and subsystems of the central beam-combiner.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/873223','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/873223"><span id="translatedtitle">Single and double superimposing <span class="hlt">interferometer</span> systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Erskine, David J. (Oakland, CA)</p> <p>2000-01-01</p> <p><span class="hlt">Interferometers</span> which can imprint a coherent delay on a broadband uncollimated beam are described. The delay value can be independent of incident ray angle, allowing interferometry using uncollimated beams from common extended sources such as lamps and fiber bundles, and facilitating Fourier Transform spectroscopy of wide angle sources. Pairs of such <span class="hlt">interferometers</span> matched in delay and dispersion can measure velocity and communicate using ordinary lamps, wide diameter optical fibers and arbitrary non-imaging paths, and not requiring a laser.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015LPICo1861.1018G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015LPICo1861.1018G"><span id="translatedtitle">How Can the TanDEM-X Digital Elevation Model Support Terrestrial Impact Crater Studies?</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gottwald, M.; Fritz, T.; Breit, H.; Schaettler, B.; Harris, A.</p> <p>2015-09-01</p> <p>The German Aerospace Center operated the X-band <span class="hlt">radar</span> satellites TerraSAR-X and TanDEM-X as a <span class="hlt">single-pass</span> SAR <span class="hlt">interferometer</span>. Data acquisition occurred over the entire land surface for the generation of a very high quality digital elevation model.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015LPICo1856.5004G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015LPICo1856.5004G"><span id="translatedtitle">The TanDEM-X DEM — Status of the New Dataset for Studying Topography of the Global Impact Crater Record</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gottwald, M.; Fritz, T.; Breit, H.; Schaettler, B.; Harris, A.</p> <p>2015-07-01</p> <p>In the TanDEM-X mission two X-band <span class="hlt">radar</span> satellites were operated as a <span class="hlt">single-pass</span> SAR <span class="hlt">interferometer</span>. From the acquired data a new digital elevation model is being generated. We report on the capabilities of this DEM for impact crater studies.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/5031415','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/5031415"><span id="translatedtitle">Achromatic self-referencing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Feldman, M.</p> <p>1994-04-19</p> <p>A self-referencing Mach-Zehnder <span class="hlt">interferometer</span> is described for accurately measuring laser wavefronts over a broad wavelength range (for example, 600 nm to 900 nm). The apparatus directs a reference portion of an input beam to a reference arm and a measurement portion of the input beam to a measurement arm, recombines the output beams from the reference and measurement arms, and registers the resulting interference pattern ([open quotes]first[close quotes] interferogram) at a first detector. Optionally, subportions of the measurement portion are diverted to second and third detectors, which respectively register intensity and interferogram signals which can be processed to reduce the first interferogram's sensitivity to input noise. The reference arm includes a spatial filter producing a high quality spherical beam from the reference portion, a tilted wedge plate compensating for off-axis aberrations in the spatial filter output, and mirror collimating the radiation transmitted through the tilted wedge plate. The apparatus includes a thermally and mechanically stable baseplate which supports all reference arm optics, or at least the spatial filter, tilted wedge plate, and the collimator. The tilted wedge plate is mounted adjustably with respect to the spatial filter and collimator, so that it can be maintained in an orientation in which it does not introduce significant wave front errors into the beam propagating through the reference arm. The apparatus is polarization insensitive and has an equal path length configuration enabling measurement of radiation from broadband as well as closely spaced laser line sources. 3 figures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://radarmet.atmos.colostate.edu/olduser/wxdave/notes/Ch1_History_Basic.pdf','EPRINT'); return false;" href="http://radarmet.atmos.colostate.edu/olduser/wxdave/notes/Ch1_History_Basic.pdf"><span id="translatedtitle"><span class="hlt">Radar</span> Meteorology<span class="hlt">Radar</span> Meteorology Feb 20, 1941 10 cm (S-band) <span class="hlt">radar</span> used to track rain showers (Ligda)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Rutledge, Steven</p> <p></p> <p><span class="hlt">Radar</span> Meteorology<span class="hlt">Radar</span> Meteorology Feb 20, 1941 10 cm (S-band) <span class="hlt">radar</span> used to track rain showers similar observations in the early 1940's (U.S. Air Corps meteorologists receiving "<span class="hlt">radar</span>" training at MIT in 1943 First operational weather <span class="hlt">radar</span>, Panama, 1943 Science of <span class="hlt">radar</span> meteorology born from WWII research</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/ca1500.photos.012957p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/ca1500.photos.012957p/"><span id="translatedtitle">66. VIEW SHOWING HOLD FOR <span class="hlt">RADAR</span> CABLES AT <span class="hlt">RADAR</span> SITE, ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>66. VIEW SHOWING HOLD FOR <span class="hlt">RADAR</span> CABLES AT <span class="hlt">RADAR</span> SITE, LOOKING NORTH Everett Weinreb, photographer, March 1988 - Mount Gleason Nike Missile Site, Angeles National Forest, South of Soledad Canyon, Sylmar, Los Angeles County, CA</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/1201.5656v1','EPRINT'); return false;" href="http://arxiv.org/pdf/1201.5656v1"><span id="translatedtitle">Comparison of Atom <span class="hlt">Interferometers</span> and Light <span class="hlt">Interferometers</span> as Space-Based Gravitational Wave Detectors</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>John G. Baker; James Ira Thorpe</p> <p>2012-01-26</p> <p>We consider a class of proposed gravitational wave detectors based on multiple atomic <span class="hlt">interferometers</span> separated by large baselines and referenced by common laser systems. We compute the sensitivity limits of these detectors due to intrinsic phase noise of the light sources, non-inertial motion of the light sources, and atomic shot noise and compare them to sensitivity limits for traditional light <span class="hlt">interferometers</span>. We find that atom <span class="hlt">interferometers</span> and light <span class="hlt">interferometers</span> are limited in a nearly identical way by intrinsic phase noise and that both require similar mitigation strategies (e.g. multiple arm instruments) to reach interesting sensitivities. The sensitivity limit from motion of the light sources is slightly different and favors the atom <span class="hlt">interferometers</span> in the low-frequency limit, although the limit in both cases is severe.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20120011249','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20120011249"><span id="translatedtitle">Comparison of Atom <span class="hlt">Interferometers</span> and Light <span class="hlt">Interferometers</span> as Space-Based Gravitational Wave Detectors</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Baker, John G.</p> <p>2012-01-01</p> <p>We consider a class of proposed gravitational wave detectors based on multiple atomic <span class="hlt">interferometers</span> separated by large baselines and referenced by common laser systems. We compute the sensitivity limits of these detectors due to intrinsic phase noise of the light sources, non-inertial motion of the light sources, and atomic shot noise and compare them to sensitivity limits for traditional light <span class="hlt">interferometers</span>. We find that atom <span class="hlt">interferometers</span> and light <span class="hlt">interferometers</span> are limited in a nearly identical way by intrinsic phase noise and that both require similar mitigation strategies (e.g. multiple arm instruments) to reach interesting sensitivities. The sensitivity limit from motion of the light sources is slightly different and favors the atom <span class="hlt">interferometers</span> in the low-frequency limit, although the limit in both cases is severe.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17932519','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17932519"><span id="translatedtitle">Fabry-Perot <span class="hlt">interferometer</span> based Mie Doppler lidar for low tropospheric wind observation.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Xia, Haiyun; Sun, Dongsong; Yang, Yuanhong; Shen, Fahua; Dong, Jingjing; Kobayashi, Takao</p> <p>2007-10-10</p> <p>Similar in principle to recent implementations of a lidar system at 355 nm [Opt. Lett. 25, 1231 (2000), Appl. Opt. 44, 6023 (2005)], an incoherent-detection Mie Doppler wind lidar at 1064 nm was developed and deployed in 2005 [Opt. Rev. 12, 409 (2005)] for wind measurements in the low troposphere, taking advantage of aerosol scattering for signal enhancement. We present a number of improvements made to the original 1064 nm system to increase its robustness for long-period operation. These include a multimode fiber for receiving the reference signal, a mode scrambler to allow uniform illumination over the Fabry-Perot <span class="hlt">interferometer</span>, and a fast scannable Fabry-Perot <span class="hlt">interferometer</span> for calibration and for the determination of outgoing laser frequency during the wind observation. With these improvements in stability, the standard deviation of peak transmission and FWHM of the Fabry-Perot <span class="hlt">interferometer</span> was determined to be 0.49% and 0.36%, respectively. The lidar wind measurements were validated within a dynamic range of +/-40 m/s. Comparison experiments with both wind profiler <span class="hlt">radar</span> and Vaisala wiresonde show good agreement with expected observation error. An example of 24 h continuous observations of wind field and aerosol backscatter coefficients in the boundary layer with 1 min and 30 m temporal and spatial resolution and 3 m/s tolerated wind velocity error is presented and fully demonstrates the stability and robustness of this lidar. PMID:17932519</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/nd0078.photos.199425p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/nd0078.photos.199425p/"><span id="translatedtitle">33. Perimeter acquisition <span class="hlt">radar</span> building room #320, perimeter acquisition <span class="hlt">radar</span> ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>33. Perimeter acquisition <span class="hlt">radar</span> building room #320, perimeter acquisition <span class="hlt">radar</span> operations center (PAROC), contains the tactical command and control group equipment required to control the par site. Showing spacetrack monitor console - Stanley R. Mickelsen Safeguard Complex, Perimeter Acquisition <span class="hlt">Radar</span> Building, Limited Access Area, between Limited Access Patrol Road & Service Road A, Nekoma, Cavalier County, ND</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19830024744','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19830024744"><span id="translatedtitle">Phase modulating the Urbana <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Herrington, L. J., Jr.; Bowhill, S. A.</p> <p>1983-01-01</p> <p>The design and operation of a switched phase modulation system for the Urbana <span class="hlt">Radar</span> System are discussed. The system is implemented and demonstrated using a simple procedure. The <span class="hlt">radar</span> system and circuits are described and analyzed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/5284265','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/5284265"><span id="translatedtitle">Process control system using polarizing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Schultz, T.J.; Kotidis, P.A.; Woodroffe, J.A.; Rostler, P.S.</p> <p>1994-02-15</p> <p>A system for nondestructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing <span class="hlt">interferometer</span> is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the <span class="hlt">interferometer</span> by only one photon multiplier. In addition the <span class="hlt">interferometer</span> includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The <span class="hlt">interferometer</span> also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the <span class="hlt">interferometer</span> per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading. 38 figures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/869806','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/869806"><span id="translatedtitle">Furnace control apparatus using polarizing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Schultz, Thomas J. (Maumee, OH); Kotidis, Petros A. (Waban, MA); Woodroffe, Jaime A. (North Reading, MA); Rostler, Peter S. (Newton, MA)</p> <p>1995-01-01</p> <p>A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing <span class="hlt">interferometer</span> is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the <span class="hlt">interferometer</span> by only one photon multiplier. In addition the <span class="hlt">interferometer</span> includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The <span class="hlt">interferometer</span> also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the <span class="hlt">interferometer</span> per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/35076','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/35076"><span id="translatedtitle">Furnace control apparatus using polarizing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Schultz, T.J.; Kotidis, P.A.; Woodroffe, J.A.; Rostler, P.S.</p> <p>1995-03-28</p> <p>A system for nondestructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing <span class="hlt">interferometer</span> is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the <span class="hlt">interferometer</span> by only one photon multiplier. In addition the <span class="hlt">interferometer</span> includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The <span class="hlt">interferometer</span> also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the <span class="hlt">interferometer</span> per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading. 38 figures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/869157','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/869157"><span id="translatedtitle">Process control system using polarizing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Schultz, Thomas J. (Maumee, OH); Kotidis, Petros A. (Waban, MA); Woodroffe, Jaime A. (North Reading, MA); Rostler, Peter S. (Newton, MA)</p> <p>1994-01-01</p> <p>A system for non-destructively measuring an object and controlling industrial processes in response to the measurement is disclosed in which an impulse laser generates a plurality of sound waves over timed increments in an object. A polarizing <span class="hlt">interferometer</span> is used to measure surface movement of the object caused by the sound waves and sensed by phase shifts in the signal beam. A photon multiplier senses the phase shift and develops an electrical signal. A signal conditioning arrangement modifies the electrical signals to generate an average signal correlated to the sound waves which in turn is correlated to a physical or metallurgical property of the object, such as temperature, which property may then be used to control the process. External, random vibrations of the workpiece are utilized to develop discernible signals which can be sensed in the <span class="hlt">interferometer</span> by only one photon multiplier. In addition the <span class="hlt">interferometer</span> includes an arrangement for optimizing its sensitivity so that movement attributed to various waves can be detected in opaque objects. The <span class="hlt">interferometer</span> also includes a mechanism for sensing objects with rough surfaces which produce speckle light patterns. Finally the <span class="hlt">interferometer</span> per se, with the addition of a second photon multiplier is capable of accurately recording beam length distance differences with only one reading.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20150003163','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20150003163"><span id="translatedtitle">Systems and Methods for <span class="hlt">Radar</span> Data Communication</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bunch, Brian (Inventor); Szeto, Roland (Inventor); Miller, Brad (Inventor)</p> <p>2013-01-01</p> <p>A <span class="hlt">radar</span> information processing system is operable to process high bandwidth <span class="hlt">radar</span> information received from a <span class="hlt">radar</span> system into low bandwidth <span class="hlt">radar</span> information that may be communicated to a low bandwidth connection coupled to an electronic flight bag (EFB). An exemplary embodiment receives <span class="hlt">radar</span> information from a <span class="hlt">radar</span> system, the <span class="hlt">radar</span> information communicated from the <span class="hlt">radar</span> system at a first bandwidth; processes the received <span class="hlt">radar</span> information into processed <span class="hlt">radar</span> information, the processed <span class="hlt">radar</span> information configured for communication over a connection operable at a second bandwidth, the second bandwidth lower than the first bandwidth; and communicates the <span class="hlt">radar</span> information from a <span class="hlt">radar</span> system, the <span class="hlt">radar</span> information communicated from the <span class="hlt">radar</span> system at a first bandwidth.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.comm.toronto.edu/~rsadve/Publications/RaniRandomNetworks_Asilomar08.pdf','EPRINT'); return false;" href="http://www.comm.toronto.edu/~rsadve/Publications/RaniRandomNetworks_Asilomar08.pdf"><span id="translatedtitle">Analysis of Random <span class="hlt">Radar</span> Networks</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Adve, Raviraj</p> <p></p> <p>, detection using distributed <span class="hlt">radar</span> apertures has received renewed attention. Such a system avails of geometry in distributed <span class="hlt">radar</span> systems. We first analyze unistatic systems with a single receiver selected of a noise-limited distributed <span class="hlt">radar</span> system. This notion allows a system designer to evaluate the trade</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19840008322','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19840008322"><span id="translatedtitle">Spaceborne Imaging <span class="hlt">Radar</span> Symposium</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Elachi, C.</p> <p>1983-01-01</p> <p>An overview of the present state of the art in the different scientific and technological fields related to spaceborne imaging <span class="hlt">radars</span> was presented. The data acquired with the SEASAT SAR (1978) and Shuttle Imaging <span class="hlt">Radar</span>, SIR-A (1981) clearly demonstrated the important emphasis in the 80's is going to be on in-depth research investigations conducted with the more flexible and sophisticated SIR series instruments and on long term monitoring of geophysical phenomena conducted from free-flying platforms such as ERS-1 and RADARSAT.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19720035721&hterms=spaceborne+laser&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dspaceborne%2Blaser','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19720035721&hterms=spaceborne+laser&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dspaceborne%2Blaser"><span id="translatedtitle">Spaceborne laser <span class="hlt">radar</span>.</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Flom, T.</p> <p>1972-01-01</p> <p>Development of laser systems to acquire and track targets in applications such as the rendezvous and docking of two spacecraft. A scan technique is described whereby a narrow laser beam is simultaneously scanned with an equally narrow receiver field-of-view without the aid of mechanical gimbals. Equations are developed in order to examine the maximum acquisition and tracking rates, and the maximum target range for a scanning laser <span class="hlt">radar</span> system. A recently built prototype of a small, lightweight, low-power-consuming scanning laser <span class="hlt">radar</span> is described.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_10 --> <div id="page_11" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="201"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhyE...74..489S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhyE...74..489S"><span id="translatedtitle">Full counting statistics of Majorana <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Strübi, Grégory; Belzig, Wolfgang; Schmidt, Thomas L.; Bruder, Christoph</p> <p>2015-11-01</p> <p>We study the full counting statistics of <span class="hlt">interferometers</span> for chiral Majorana fermions with two incoming and two outgoing Dirac fermion channels. In the absence of interactions, the FCS can be obtained from the 4×4 scattering matrix S that relates the outgoing Dirac fermions to the incoming Dirac fermions. After presenting explicit expressions for the higher-order current correlations for a modified Hanbury Brown-Twiss <span class="hlt">interferometer</span>, we note that the cumulant-generating function can be interpreted such that unit-charge transfer processes correspond to two independent half-charge transfer processes, or alternatively, to two independent electron-hole conversion processes. By a combination of analytical and numerical approaches, we verify that this factorization property holds for a general SO(4) scattering matrix, i.e. for a general <span class="hlt">interferometer</span> geometry.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22053983','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22053983"><span id="translatedtitle">A heterodyne <span class="hlt">interferometer</span> for angle metrology</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hahn, Inseob; Weilert, M.; Wang, X.; Goullioud, R.</p> <p>2010-04-15</p> <p>We have developed a compact, high-resolution, angle measurement instrument based on a heterodyne <span class="hlt">interferometer</span>. Common-path heterodyne <span class="hlt">interferometer</span> metrology is used to measure displacements of a reflective target surface. In the <span class="hlt">interferometer</span> set up, an optical mask is used to sample the laser beam reflecting back from four areas on a target surface. From the relative displacement measurements of the target surface areas, we can simultaneously determine angular rotations around two orthogonal axes in a plane perpendicular to the measurement beam propagation direction. The device is used in a testbed for a tracking telescope system where pitch and yaw angle measurements of a flat mirror are performed. Angle noise measurement of the device shows 0.1 nrad/{radical}(Hz) at 1 Hz, at a working distance of 1 m. The operation range and nonlinearity of the device when used with a flat mirror is approximately {+-}0.15 mrad, and 3 {mu}rad rms, respectively.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/18542551','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/18542551"><span id="translatedtitle">Computing extinction maps of star nulling <span class="hlt">interferometers</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hénault, Francois</p> <p>2008-03-31</p> <p>Herein is discussed the performance of spaceborne nulling <span class="hlt">interferometers</span> searching for extra-solar planets, in terms of their extinction maps projected on-sky. In particular, it is shown that the designs of Spatial Filtering (SF) and Achromatic Phase Shifter (APS) subsystems, both required to achieve planet detection and characterization, can sensibly affect the nulling maps produced by a simple Bracewell <span class="hlt">interferometer</span>. Analytical relationships involving cross correlation products are provided and numerical simulations are performed, demonstrating marked differences in the aspect of extinction maps and the values of attained fringes contrasts. It is concluded that depending on their basic principles and designs, FS and APS will result in variable capacities for serendipitous discoveries of planets orbiting around their parent star. The mathematical relationships presented in this paper are assumed to be general, i.e. they should apply to other types of multi-apertures nulling <span class="hlt">interferometers</span>. PMID:18542551</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/1206.2265v1','EPRINT'); return false;" href="http://arxiv.org/pdf/1206.2265v1"><span id="translatedtitle">Optimal measurement precision of a nonlinear <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Juha Javanainen; Han Chen</p> <p>2012-06-11</p> <p>We study the best attainable measurement precision when a double-well trap with bosons inside acts as an <span class="hlt">interferometer</span> to measure the energy difference of the atoms on the two sides of the trap. We introduce time independent perturbation theory as the main tool in both analytical arguments and numerical computations. Nonlinearity from atom-atom interactions will not indirectly allow the <span class="hlt">interferometer</span> to beat the Heisenberg limit, but in many regimes of the operation the Heisenberg limit scaling of measurement precision is preserved in spite of added tunneling of the atoms and atom-atom interactions, often even with the optimal prefactor.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/astro-ph/0011309v1','EPRINT'); return false;" href="http://arxiv.org/pdf/astro-ph/0011309v1"><span id="translatedtitle">Sensitivity of an Imaging Space Infrared <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Tadashi Nakajima; Hideo Matsuhara</p> <p>2000-11-16</p> <p>We study the sensitivities of space infrared <span class="hlt">interferometers</span>. We formulate the signal-to-noise ratios of infrared images obtained by aperture synthesis in the presence of source shot noise, background shot noise and detector read noise. We consider the case in which n beams are pairwise combined at n(n-1)/2 detectors, and the case in which all the n beams are combined at a single detector. We apply the results to future missions, Terrestrial Planet Finder and Darwin. We also discuss the potential of a far-infrared <span class="hlt">interferometer</span> for a deep galaxy survey.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20782917','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20782917"><span id="translatedtitle">Gravitational wave detectors based on matter wave <span class="hlt">interferometers</span> (MIGO) are no better than laser <span class="hlt">interferometers</span> (LIGO)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Roura, Albert; Brill, Dieter R.; Hu, B.L.; Misner, Charles W.; Phillips, William D.</p> <p>2006-04-15</p> <p>We show that a recent claim that matter wave <span class="hlt">interferometers</span> have a much higher sensitivity than laser <span class="hlt">interferometers</span> for a comparable physical setup is unfounded. We point out where the mistake in the earlier analysis is made. We also disprove the claim that only a description based on the geodesic deviation equation can produce the correct physical result. The equations for the quantum dynamics of nonrelativistic massive particles in a linearly perturbed spacetime derived here are useful for treating a wider class of related physical problems. A general discussion on the use of atom <span class="hlt">interferometers</span> for the detection of gravitational waves is also provided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20641070','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20641070"><span id="translatedtitle">Optimum quantum states for <span class="hlt">interferometers</span> with fixed and moving mirrors</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Luis, Alfredo</p> <p>2004-04-01</p> <p>We address a systematic approach to the study of the optimum states reaching maximum resolution for <span class="hlt">interferometers</span> with moving mirrors. We find a correspondence between the optimum states for <span class="hlt">interferometers</span> with fixed and moving mirrors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/870113','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/870113"><span id="translatedtitle">Impulse <span class="hlt">radar</span> studfinder</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>McEwan, Thomas E. (Livermore, CA)</p> <p>1995-01-01</p> <p>An impulse <span class="hlt">radar</span> studfinder propagates electromagnetic pulses and detects reflected pulses from a fixed range. Unmodulated pulses, about 200 ps wide, are emitted. A large number of reflected pulses are sampled and averaged. Background reflections are subtracted. Reflections from wall studs or other hidden objects are detected and displayed using light emitting diodes.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/119057','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/119057"><span id="translatedtitle">Impulse <span class="hlt">radar</span> studfinder</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>McEwan, T.E.</p> <p>1995-10-10</p> <p>An impulse <span class="hlt">radar</span> studfinder propagates electromagnetic pulses and detects reflected pulses from a fixed range. Unmodulated pulses, about 200 ps wide, are emitted. A large number of reflected pulses are sampled and averaged. Background reflections are subtracted. Reflections from wall studs or other hidden objects are detected and displayed using light emitting diodes. 9 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110011956','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110011956"><span id="translatedtitle">Miniaturized Ka-Band Dual-Channel <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hoffman, James P.; Moussessian, Alina; Jenabi, Masud; Custodero, Brian</p> <p>2011-01-01</p> <p>Smaller (volume, mass, power) electronics for a Ka-band (36 GHz) <span class="hlt">radar</span> <span class="hlt">interferometer</span> were required. To reduce size and achieve better control over RFphase versus temperature, fully hybrid electronics were developed for the RF portion of the <span class="hlt">radar</span> s two-channel receiver and single-channel transmitter. In this context, fully hybrid means that every active RF device was an open die, and all passives were directly attached to the subcarrier. Attachments were made using wire and ribbon bonding. In this way, every component, even small passives, was selected for the fabrication of the two <span class="hlt">radar</span> receivers, and the devices were mounted relative to each other in order to make complementary components isothermal and to isolate other components from potential temperature gradients. This is critical for developing receivers that can track each other s phase over temperature, which is a key mission driver for obtaining ocean surface height. Fully hybrid, Ka-band (36 GHz) <span class="hlt">radar</span> transmitter and dual-channel receiver were developed for spaceborne <span class="hlt">radar</span> interferometry. The fully hybrid fabrication enables control over every aspect of the component selection, placement, and connection. Since the two receiver channels must track each other to better than 100 millidegrees of RF phase over several minutes, the hardware in the two receivers must be "identical," routed the same (same line lengths), and as isothermal as possible. This level of design freedom is not possible with packaged components, which include many internal passive, unknown internal connection lengths/types, and often a single orientation of inputs and outputs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.psfc.mit.edu/ldx/pubs/presents/dpp05_AB.pdf','EPRINT'); return false;" href="http://www.psfc.mit.edu/ldx/pubs/presents/dpp05_AB.pdf"><span id="translatedtitle">Microwave <span class="hlt">Interferometer</span> Density Diagnostic for the Levitated Dipole Experiment</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Microwave <span class="hlt">Interferometer</span> Density Diagnostic for the Levitated Dipole Experiment A. Boxer, J. Kesner the density profile of the plasma in LDX, we are constructing a multi-channel microwave <span class="hlt">interferometer</span> be inverted to reconstruct a radially symmetric density profile. The microwave <span class="hlt">interferometer</span> of LDX</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.psfc.mit.edu/ldx/pubs/presents/dpp04_boxer.pdf','EPRINT'); return false;" href="http://www.psfc.mit.edu/ldx/pubs/presents/dpp04_boxer.pdf"><span id="translatedtitle">Microwave <span class="hlt">Interferometer</span> Density Diagnostic for the Levitated Dipole Experiment</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Microwave <span class="hlt">Interferometer</span> Density Diagnostic for the Levitated Dipole Experiment A. Boxer, J. Kesner a multi-channel microwave <span class="hlt">interferometer</span>. Such a device makes use the relationship between a plasma;Basic Design · An RF of 60 GHz puts our <span class="hlt">interferometer</span> in the microwave spectrum. · The primary design</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015OptLT..73...63Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015OptLT..73...63Z"><span id="translatedtitle">Triple detection fiber differentiating <span class="hlt">interferometer</span> based on low-coherence <span class="hlt">interferometer</span> and its passive demodulation scheme</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhen, Shenglai; Chen, Jian; Li, Hui; Wang, Xiaoguang; Cao, Zhigang; Zhu, Jun; Xu, Feng; Yu, Benli</p> <p>2015-10-01</p> <p>This paper presents a triple detection fiber differential <span class="hlt">interferometer</span> and its passive demodulation scheme. The <span class="hlt">interferometer</span> is based on an all fiber Mach-Zehnder and Sagnac hybrid configuration, which is composed of a fiber ASE source, a section of delay fiber, a 3×3 fiber coupler and several other fiber components. In the <span class="hlt">interferometer</span>, the signal beam and reference beam travel along the same path but in opposite directions. The received signal is demodulated by a triple detection passive demodulation scheme. The <span class="hlt">interferometer</span> can measure the absolute amplitudes and frequencies of phase sensitive signals with large dynamic range, and the low frequency environmental disturbance is removed simultaneously due to the phase compression mechanism. The experimental results demonstrate that the phase demodulation resolution is 6×10-5 rad and the maximum measuring amplitude is up to 90 rad. This method can be used to measure many kinds of parameters such as vibration and refractive index.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20070034821','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20070034821"><span id="translatedtitle">Control of Formation-Flying Multi-Element Space <span class="hlt">Interferometers</span> with Direct <span class="hlt">Interferometer</span>-Output Feedback</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lu, Hui-Ling; Cheng, Victor H. L.; Lyon, Richard G.; Carpenter, Kenneth G.</p> <p>2007-01-01</p> <p>The long-baseline space <span class="hlt">interferometer</span> concept involving formation flying of multiple spacecrafts holds great promise as future space missions for high-resolution imagery. A major challenge of obtaining high-quality interferometric synthesized images from long-baseline space <span class="hlt">interferometers</span> is to accurately control these spacecraft and their optics payloads in the specified configuration. Our research focuses on the determination of the optical errors to achieve fine control of long-baseline space <span class="hlt">interferometers</span> without resorting to additional sensing equipment. We present a suite of estimation tools that can effectively extract from the raw interferometric image relative x/y, piston translational and tip/tilt deviations at the exit pupil aperture. The use of these error estimates in achieving control of the <span class="hlt">interferometer</span> elements is demonstrated using simulated as well as laboratory-collected interferometric stellar images.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012SPIE.8452E..2AO','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012SPIE.8452E..2AO"><span id="translatedtitle">Development of the test <span class="hlt">interferometer</span> for ALMA</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Olguin, R.; Shen, T.; Brito, R.; Saez, A.; Soto, R.; Asayama, S.; Follert, C.; Knee, L.; Quintana, A.; Rabanus, D.; Reynolds, E.; Saez, N.; Sepulveda, J.</p> <p>2012-09-01</p> <p>The ALMA Test <span class="hlt">Interferometer</span> appeared as an infrastructure solution to increase both ALMA time availability for science activities and time availability for Software testing and Engineering activities at a reduced cost (<30000K USD) and a low setup time of less than 1 hour. The Test <span class="hlt">Interferometer</span> could include up to 16 Antennas when used with only AOS resources and a possible maximum of 4 Antennas when configured using Correlator resources at OSF. A joined effort between ADC and ADE-IG took the challenge of generate the Test <span class="hlt">Interferometer</span> from an already defined design for operations which imposed a lot of complex restrictions on how to implement it. Through and intensive design and evaluation work it was determined that is possible to make an initial implementation using the ACA Correlator and now it is also being tested the feasibility to implement the Testing <span class="hlt">Interferometer</span> connecting the Test Array at AOS with Correlator equipment installed at the OSF, separated by 30 km. app. Lastly, efforts will be done to get interferometry between AOS and OSF Antennas with a baseline of approximately 24 km.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/10159658','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/10159658"><span id="translatedtitle">A microwave <span class="hlt">interferometer</span> to measure transient properties</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Warthen, B.J.; Luther, G.G.</p> <p>1982-12-31</p> <p>A simple K-band microwave <span class="hlt">interferometer</span> has been developed at the Los Alamos National Laboratory to measure various transient properties in both energetic (high explosive) and passive (grout and Teflon) materials. The <span class="hlt">interferometer</span> measures the position as a function of time of either a dielectric discontinuity, i.e., a shock front, or the position as a function of time of a conducting surface such as the detonation wave in a high explosive. By embedding a reflector in a dielectric material, both the particle velocity and the shock velocity may be measured at the same time and in the same place. The <span class="hlt">interferometer</span> is constructed (with slight modifications) of commercially available microwave components. The total material cost for a complete working instrument is a few hundred dollars. Details of the construction will be given. As an example of the range of uses of the <span class="hlt">interferometer</span>, it has been used to measure the detonation-to-deflagration transition in HMX and the shock properties of the grout in a nuclear test in Nevada. Data on these and other experiments are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=doppler+AND+effect&pg=3&id=EJ474949','ERIC'); return false;" href="http://eric.ed.gov/?q=doppler+AND+effect&pg=3&id=EJ474949"><span id="translatedtitle">A Microwave <span class="hlt">Interferometer</span> on an Air Track.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Polley, J. Patrick</p> <p>1993-01-01</p> <p>Uses an air track and microwave transmitters and receivers to make a Michelson <span class="hlt">interferometer</span>. Includes three experiments: (1) measuring the wavelength of microwaves, (2) measuring the wavelength of microwaves by using the Doppler Effect, and (3) measuring the Doppler shift. (MVL)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3583753','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3583753"><span id="translatedtitle">Electronic transmittance phase extracted from mesoscopic <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2012-01-01</p> <p>The usual experimental set-up for measuring the wave function phase shift of electrons tunneling through a quantum dot (QD) embedded in a ring (i.e., the transmittance phase) is the so-called ‘open’ <span class="hlt">interferometer</span> as first proposed by Schuster et al. in 1997, in which the electrons back-scattered at source and the drain contacts are absorbed by additional leads in order to exclude multiple interference. While in this case one can conveniently use a simple two-path interference formula to extract the QD transmittance phase, the open <span class="hlt">interferometer</span> has also a number of draw-backs, such as a reduced signal and some uncertainty regarding the effects of the extra leads. Here we present a meaningful theoretical study of the QD transmittance phase in ‘closed’ <span class="hlt">interferometers</span> (i.e., connected only to source and drain leads). By putting together data from existing literature and giving some new proofs, we show both analytically and by numerical simulations that the existence of phase lapses between consecutive resonances of the ‘bare’ QD is related to the signs of the corresponding Fano parameters - of the QD + ring system. More precisely, if the Fano parameters have the same sign, the transmittance phase of the QD exhibits a ? lapse. Therefore, closed mesoscopic <span class="hlt">interferometers</span> can be used to address the ‘universal phase lapse’ problem. Moreover, the data from already existing Fano interference experiments from Kobayashi et al. in 2003 can be used to infer the phase lapses. PMID:23061877</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19750053120&hterms=berkeley&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3Dberkeley','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19750053120&hterms=berkeley&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3Dberkeley"><span id="translatedtitle">Berkeley heterodyne <span class="hlt">interferometer</span>. [for IR stellar observations</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Betz, A.</p> <p>1975-01-01</p> <p>A prototype heterodyne stellar <span class="hlt">interferometer</span> has been built in order to demonstrate the feasibility of heterodyne techniques in measuring angular diameters of bright infrared stars. The first system tests were performed in December 1972. Attention is given to investigations concerning the possibility that optical air turbulence within the structure of the solar telescope employed can possibly destroy the phase coherence of the fringe signals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20120011910','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20120011910"><span id="translatedtitle">An MSK <span class="hlt">Radar</span> Waveform</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Quirk, Kevin J.; Srinivasan, Meera</p> <p>2012-01-01</p> <p>The minimum-shift-keying (MSK) <span class="hlt">radar</span> waveform is formed by periodically extending a waveform that separately modulates the in-phase and quadrature- phase components of the carrier with offset pulse-shaped pseudo noise (PN) sequences. To generate this waveform, a pair of periodic PN sequences is each passed through a pulse-shaping filter with a half sinusoid impulse response. These shaped PN waveforms are then offset by half a chip time and are separately modulated on the in-phase and quadrature phase components of an RF carrier. This new <span class="hlt">radar</span> waveform allows an increase in <span class="hlt">radar</span> resolution without the need for additional spectrum. In addition, it provides self-interference suppression and configurable peak sidelobes. Compared strictly on the basis of the expressions for delay resolution, main-lobe bandwidth, effective Doppler bandwidth, and peak ambiguity sidelobe, it appears that bi-phase coded (BPC) outperforms the new MSK waveform. However, a <span class="hlt">radar</span> waveform must meet certain constraints imposed by the transmission and reception of the modulation, as well as criteria dictated by the observation. In particular, the phase discontinuity of the BPC waveform presents a significant impediment to the achievement of finer resolutions in <span class="hlt">radar</span> measurements a limitation that is overcome by using the continuous phase MSK waveform. The phase continuity, and the lower fractional out-of-band power of MSK, increases the allowable bandwidth compared with BPC, resulting in a factor of two increase in the range resolution of the <span class="hlt">radar</span>. The MSK waveform also has been demonstrated to have an ambiguity sidelobe structure very similar to BPC, where the sidelobe levels can be decreased by increasing the length of the m-sequence used in its generation. This ability to set the peak sidelobe level is advantageous as it allows the system to be configured to a variety of targets, including those with a larger dynamic range. Other conventionally used waveforms that possess an even greater spectral efficiency than the MSK waveform, such as linear frequency modulation (LFM) and Costas frequency hopping, have a fixed peak sidelobe level that is therefore not configurable, and can be exceeded by high contrast targets. Furthermore, in the case of a multistatic experiment observing a target in motion, self-interference from the transmitter to the receiver is mitigated by the MSK waveform. Waveforms that have delay Doppler coupling, such as LFM, provide no such protection.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_11 --> <div id="page_12" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="221"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19920066937&hterms=bhabha&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dbhabha','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920066937&hterms=bhabha&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Dbhabha"><span id="translatedtitle">Compact in-line laser radial shear <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shukla, R. P.; Moghbel, M.; Venkateswarlu, P.</p> <p>1992-01-01</p> <p>A compact in-line radial shearing <span class="hlt">interferometer</span> using laser as a light source is presented. The <span class="hlt">interferometer</span> is made out of a cube-type beam splitter so that the two opposite surfaces are generated with different curvatures while the normal to the entrance and exit surfaces are in the same line. The <span class="hlt">interferometer</span> is simple to make and easy to align. Aberration analysis of the <span class="hlt">interferometer</span> is also presented. Some applications of the <span class="hlt">interferometer</span> for testing lenses and infrared optical systems and for accessing the quality of an emerging wave front from the exit slit of a monochromator are suggested.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20150008619&hterms=mask&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dmask','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20150008619&hterms=mask&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dmask"><span id="translatedtitle">The Mask Designs for Space <span class="hlt">Interferometer</span> Mission (SIM)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Wang, Xu</p> <p>2008-01-01</p> <p>The Space <span class="hlt">Interferometer</span> Mission (SIM) consists of three <span class="hlt">interferometers</span> (science, guide1, and guide2) and two optical paths (metrology and starlight). The system requirements for each <span class="hlt">interferometer</span>/optical path combination are different and sometimes work against each other. A diffraction model is developed to design and optimize various masks to simultaneously meet the system requirements of three <span class="hlt">interferometers</span>. In this paper, the details of this diffraction model will be described first. Later, the mask design for each <span class="hlt">interferometer</span> will be presented to demonstrate the system performance compliance. In the end, a tolerance sensitivity study on the geometrical dimension, shape, and the alignment of these masks will be discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www-ssc.igpp.ucla.edu/CTR70/Palmer.pdf','EPRINT'); return false;" href="http://www-ssc.igpp.ucla.edu/CTR70/Palmer.pdf"><span id="translatedtitle">MODELING VESTA'S <span class="hlt">RADAR</span> E. M. Palmer (UCLA)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Strangeway, Robert J.</p> <p></p> <p>MODELING VESTA'S <span class="hlt">RADAR</span> PROPERTIES E. M. Palmer (UCLA) E. Heggy (JPL), M. T. Capria (INAFIAPS), ( ) ll ( )F. Tosi (INAFIAPS), C. T. Russell (UCLA) #12;Observing Asteroids with <span class="hlt">Radar</span> The Issue with <span class="hlt">Radar</span> · We measure the <span class="hlt">radar</span> backscatter · Can get shape and spin Transmitting Earthbased <span class="hlt">Radar</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SPIE.9461E..0UF','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SPIE.9461E..0UF"><span id="translatedtitle"><span class="hlt">Radar</span> cross-sectional study using noise <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Freundorfer, A. P.; Siddiqui, J. Y.; Antar, Y. M. M.</p> <p>2015-05-01</p> <p>A noise <span class="hlt">radar</span> system is proposed with capabilities to measure and acquire the <span class="hlt">radar</span> cross-section (RCS) of targets. The proposed system can cover a noise bandwidth of near DC to 50 GHz. The noise <span class="hlt">radar</span> RCS measurements were conducted for selective targets like spheres and carpenter squares with and without dielectric bodies for a noise band of 400MHz-5000MHz. The bandwidth of operation was limited by the multiplier and the antennae used.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/nd0078.photos.199433p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/nd0078.photos.199433p/"><span id="translatedtitle">41. Perimeter acquisition <span class="hlt">radar</span> building <span class="hlt">radar</span> element and coaxial display, ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>41. Perimeter acquisition <span class="hlt">radar</span> building <span class="hlt">radar</span> element and coaxial display, with drawing of typical antenna section. Drawing, from left to right, shows element, aluminum ground plane, cable connectors and hardware, cable, and back-up ring. Grey area is the concrete wall - Stanley R. Mickelsen Safeguard Complex, Perimeter Acquisition <span class="hlt">Radar</span> Building, Limited Access Area, between Limited Access Patrol Road & Service Road A, Nekoma, Cavalier County, ND</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('//www.loc.gov/pictures/collection/hh/item/ak0486.photos.193536p/','SCIGOV-HHH'); return false;" href="//www.loc.gov/pictures/collection/hh/item/ak0486.photos.193536p/"><span id="translatedtitle">51. View of upper <span class="hlt">radar</span> scanner switch in <span class="hlt">radar</span> scanner ...</span></a></p> <p><a target="_blank" href="http://www.loc.gov/pictures/collection/hh/">Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey</a></p> <p></p> <p></p> <p>51. View of upper <span class="hlt">radar</span> scanner switch in <span class="hlt">radar</span> scanner building 105 from upper catwalk level showing emanating waveguides from upper switch (upper one-fourth of photograph) and emanating waveguides from lower <span class="hlt">radar</span> scanner switch in vertical runs. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20030105593','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20030105593"><span id="translatedtitle">Investigation of Space <span class="hlt">Interferometer</span> Control Using Imaging Sensor Output Feedback</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Leitner, Jesse A.; Cheng, Victor H. L.</p> <p>2003-01-01</p> <p>Numerous space interferometry missions are planned for the next decade to verify different enabling technologies towards very-long-baseline interferometry to achieve high-resolution imaging and high-precision measurements. These objectives will require coordinated formations of spacecraft separately carrying optical elements comprising the <span class="hlt">interferometer</span>. High-precision sensing and control of the spacecraft and the <span class="hlt">interferometer</span>-component payloads are necessary to deliver sub-wavelength accuracy to achieve the scientific objectives. For these missions, the primary scientific product of <span class="hlt">interferometer</span> measurements may be the only source of data available at the precision required to maintain the spacecraft and <span class="hlt">interferometer</span>-component formation. A concept is studied for detecting the <span class="hlt">interferometer</span>'s optical configuration errors based on information extracted from the <span class="hlt">interferometer</span> sensor output. It enables precision control of the optical components, and, in cases of space <span class="hlt">interferometers</span> requiring formation flight of spacecraft that comprise the elements of a distributed instrument, it enables the control of the formation-flying vehicles because independent navigation or ranging sensors cannot deliver the high-precision metrology over the entire required geometry. Since the concept can act on the quality of the <span class="hlt">interferometer</span> output directly, it can detect errors outside the capability of traditional metrology instruments, and provide the means needed to augment the traditional instrumentation to enable enhanced performance. Specific analyses performed in this study include the application of signal-processing and image-processing techniques to solve the problems of <span class="hlt">interferometer</span> aperture baseline control, <span class="hlt">interferometer</span> pointing, and orientation of multiple <span class="hlt">interferometer</span> aperture pairs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20030032246&hterms=aperture+synthesis+imaging&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Daperture%2Bsynthesis%2Bimaging','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20030032246&hterms=aperture+synthesis+imaging&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Daperture%2Bsynthesis%2Bimaging"><span id="translatedtitle">Investigation of Space <span class="hlt">Interferometer</span> Control Using Imaging Sensor Output Feedback</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Cheng, Victore H. L.; Leitner, Jesse A.</p> <p>2003-01-01</p> <p>Numerous space interferometry missions are planned for the next decade to verify different enabling technologies towards very-long-baseline interferometry to achieve high-resolution imaging and high-precision measurements. These objectives will require coordinated formations of spacecraft separately carrying optical elements comprising the <span class="hlt">interferometer</span>. High-precision sensing and control of the spacecraft and the <span class="hlt">interferometer</span>-component payloads are necessary to deliver sub-wavelength accuracy to achieve the scientific objectives. For these missions, the primary scientific product of <span class="hlt">interferometer</span> measurements may be the only source of data available at the precision required to maintain the spacecraft and <span class="hlt">interferometer</span>-component formation. A concept is studied for detecting the <span class="hlt">interferometer</span>'s optical configuration errors based on information extracted from the <span class="hlt">interferometer</span> sensor output. It enables precision control of the optical components, and, in cases of space <span class="hlt">interferometers</span> requiring formation flight of spacecraft that comprise the elements of a distributed instrument, it enables the control of the formation flying vehicles because independent navigation or ranging sensors cannot deliver the high-precision metrology over the entire required geometry. Since the concept can act on the quality of the <span class="hlt">interferometer</span> output directly, it can detect errors outside the capability of traditional metrology instruments, and provide the means needed to augment the traditional instrumentation to enable enhanced performance. Specific analyses performed in this study include the application of signal-processing and image-processing techniques to solve the problems of <span class="hlt">interferometer</span> aperture baseline control, <span class="hlt">interferometer</span> pointing, and orientation of multiple <span class="hlt">interferometer</span> aperture pairs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20050170605','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20050170605"><span id="translatedtitle"><span class="hlt">RADAR</span> Reveals Titan Topography</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Kirk, R. L.; Callahan, P.; Seu, R.; Lorenz, R. D.; Paganelli, F.; Lopes, R.; Elachi, C.</p> <p>2005-01-01</p> <p>The Cassini Titan <span class="hlt">RADAR</span> Mapper is a K(sub u)-band (13.78 GHz, lambda = 2.17 cm) linear polarized <span class="hlt">RADAR</span> instrument capable of operating in synthetic aperture (SAR), scatterometer, altimeter and radiometer modes. During the first targeted flyby of Titan on 26 October, 2004 (referred to as Ta) observations were made in all modes. Evidence for topographic relief based on the Ta altimetry and SAR data are presented here. Additional SAR and altimetry observations are planned for the T3 encounter on 15 February, 2005, but have not been carried out at this writing. Results from the T3 encounter relevant to topography will be included in our presentation. Data obtained in the Ta encounter include a SAR image swath</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20010041231&hterms=1084&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3D%2526%25231084','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20010041231&hterms=1084&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3D%2526%25231084"><span id="translatedtitle">Kuiper Belt Mapping <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Freeman, A.; Nilsen, E.</p> <p>2001-01-01</p> <p>Since their initial discovery in 1992, to date only a relatively small number of Kuiper Belt Objects (KBO's) have been discovered. Current detection techniques rely on frame-to-frame comparisons of images collected by optical telescopes such as Hubble, to detect KBO's as they move against the background stellar field. Another technique involving studies of KBO's through occultation of known stars has been proposed. Such techniques are serendipitous, not systematic, and may lead to an inadequate understanding of the size, range, and distribution of KBO's. In this paper, a future Kuiper Belt Mapping <span class="hlt">Radar</span> is proposed as a solution to the problem of mapping the size distribution, extent, and range of KBO's. This approach can also be used to recover <span class="hlt">radar</span> albedo and object rotation rates. Additional information is contained in the original extended abstract.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SPIE.9506E..0GB','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SPIE.9506E..0GB"><span id="translatedtitle">A compact semiconductor digital <span class="hlt">interferometer</span> and its applications</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Britsky, Oleksander I.; Gorbov, Ivan V.; Petrov, Viacheslav V.; Balagura, Iryna V.</p> <p>2015-05-01</p> <p>The possibility of using semiconductor laser <span class="hlt">interferometers</span> to measure displacements at the nanometer scale was demonstrated. The creation principles of miniature digital Michelson <span class="hlt">interferometers</span> based on semiconductor lasers were proposed. The advanced processing algorithm for the <span class="hlt">interferometer</span> quadrature signals was designed. It enabled to reduce restrictions on speed of measured movements. A miniature semiconductor digital Michelson <span class="hlt">interferometer</span> was developed. Designing of the precision temperature stability system for miniature low-cost semiconductor laser with 0.01º? accuracy enabled to use it for creation of compact <span class="hlt">interferometer</span> rather than a helium-neon one. Proper firmware and software was designed for the <span class="hlt">interferometer</span> signals real-time processing and conversion in to respective shifts. In the result the relative displacement between 0-500 mm was measured with a resolution of better than 1 nm. Advantages and disadvantages of practical use of the compact semiconductor digital <span class="hlt">interferometer</span> in seismometers for the measurement of shifts were shown.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3916837','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3916837"><span id="translatedtitle">Quantum metrology with parametric amplifier-based photon correlation <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Hudelist, F.; Kong, Jia; Liu, Cunjin; Jing, Jietai; Ou, Z.Y.; Zhang, Weiping</p> <p>2014-01-01</p> <p>Conventional <span class="hlt">interferometers</span> usually utilize beam splitters for wave splitting and recombination. These <span class="hlt">interferometers</span> are widely used for precision measurement. Their sensitivity for phase measurement is limited by the shot noise, which can be suppressed with squeezed states of light. Here we study a new type of <span class="hlt">interferometer</span> in which the beam splitting and recombination elements are parametric amplifiers. We observe an improvement of 4.1±0.3?dB in signal-to-noise ratio compared with a conventional <span class="hlt">interferometer</span> under the same operating condition, which is a 1.6-fold enhancement in rms phase measurement sensitivity beyond the shot noise limit. The improvement is due to signal enhancement. Combined with the squeezed state technique for shot noise suppression, this <span class="hlt">interferometer</span> promises further improvement in sensitivity. Furthermore, because nonlinear processes are involved in this <span class="hlt">interferometer</span>, we can couple a variety of different waves and form new types of hybrid <span class="hlt">interferometers</span>, opening a door for many applications in metrology. PMID:24476950</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/870851','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/870851"><span id="translatedtitle">Imaging synthetic aperture <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Burns, Bryan L. (Tijeras, NM); Cordaro, J. Thomas (Albuquerque, NM)</p> <p>1997-01-01</p> <p>A linear-FM SAR imaging <span class="hlt">radar</span> method and apparatus to produce a real-time image by first arranging the returned signals into a plurality of subaperture arrays, the columns of each subaperture array having samples of dechirped baseband pulses, and further including a processing of each subaperture array to obtain coarse-resolution in azimuth, then fine-resolution in range, and lastly, to combine the processed subapertures to obtain the final fine-resolution in azimuth. Greater efficiency is achieved because both the transmitted signal and a local oscillator signal mixed with the returned signal can be varied on a pulse-to-pulse basis as a function of <span class="hlt">radar</span> motion. Moreover, a novel circuit can adjust the sampling location and the A/D sample rate of the combined dechirped baseband signal which greatly reduces processing time and hardware. The processing steps include implementing a window function, stabilizing either a central reference point and/or all other points of a subaperture with respect to doppler frequency and/or range as a function of <span class="hlt">radar</span> motion, sorting and compressing the signals using a standard fourier transforms. The stabilization of each processing part is accomplished with vector multiplication using waveforms generated as a function of <span class="hlt">radar</span> motion wherein these waveforms may be synthesized in integrated circuits. Stabilization of range migration as a function of doppler frequency by simple vector multiplication is a particularly useful feature of the invention; as is stabilization of azimuth migration by correcting for spatially varying phase errors prior to the application of an autofocus process.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19920003655','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19920003655"><span id="translatedtitle">Goldstone solar system <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Jurgens, Raymond F.</p> <p>1991-01-01</p> <p>Caltech/Jet Propulsion Laboratory (JPL) <span class="hlt">radar</span> astronomers made use of the Very Large Array (VLA) at Socorro, NM, during February 1990, to receive radio echoes from the planet Venus. The transmitter was the 70 meter antenna at the Goldstone complex northwest of Barstow, CA. These observations contain new information about the roughness of Venus at cm to decimeter scales and are complementary to information being obtained by the Magellan spacecraft. Asteroid observations are also discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19870007710','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19870007710"><span id="translatedtitle">Spaceborne Imaging <span class="hlt">Radar</span> Project</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Herman, Neil</p> <p>1986-01-01</p> <p>In June of 1985 the Project Initiation Agreement was signed by the Jet Propulsion Laboratory and the NASA Office of Space Science and Applications for the Spaceborne Imaging <span class="hlt">Radar</span> Project (SIR). The thrust of the Spaceborne Imaging <span class="hlt">Radar</span> Project is to continue the evolution of synthetic aperture <span class="hlt">radar</span> (SAR) science and technology developed during SEASAT, SIR-A and SIR-B missions to meet the needs of the Earth Observing System (EOS) in the mid 1990's. As originally formulated, the Project plans were for a reflight of the SIR-B in 1987, the development of a new SAR, SIR-C, for missions in mid 1989 and early 1990, and the upgrade of SIR-C to EOS configuration with a qualification flight aboard the shuttle in the 1993 time frame (SIR-D). However, the loss of the shuttle Challenger has delayed the first manifest for SIR to early 1990. This delay prompted the decision to drop SIR-B reflight plans and move ahead with SIR-C to more effectively utilize this first mission opportunity. The planning for this project is discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013SPIE.8714E..0HM','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013SPIE.8714E..0HM"><span id="translatedtitle">Cognitive processing for nonlinear <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Martone, Anthony; Ranney, Kenneth; Hedden, Abigail; Mazzaro, Gregory; McNamara, David</p> <p>2013-05-01</p> <p>An increasingly cluttered electromagnetic environment (EME) is a growing problem for <span class="hlt">radar</span> systems. This problem is becoming critical as the available frequency spectrum shrinks due to growing wireless communication device usage and changing regulations. A possible solution to these problems is cognitive <span class="hlt">radar</span>, where the cognitive <span class="hlt">radar</span> learns from the environment and intelligently modifies the transmit waveform. In this paper, a cognitive nonlinear <span class="hlt">radar</span> processing framework is introduced where the main components of this framework consist of spectrum sensing processing, target detection and classification, and decision making. The emphasis of this paper is to introduce a spectrum sensing processing technique that identifies a transmit-receive frequency pair for nonlinear <span class="hlt">radar</span>. It will be shown that the proposed technique successfully identifies a transmit-receive frequency pair for nonlinear <span class="hlt">radar</span> from data collected from the EME.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007RvGeo..45.2004F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007RvGeo..45.2004F"><span id="translatedtitle">The Shuttle <span class="hlt">Radar</span> Topography Mission</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Farr, Tom G.; Rosen, Paul A.; Caro, Edward; Crippen, Robert; Duren, Riley; Hensley, Scott; Kobrick, Michael; Paller, Mimi; Rodriguez, Ernesto; Roth, Ladislav; Seal, David; Shaffer, Scott; Shimada, Joanne; Umland, Jeffrey; Werner, Marian; Oskin, Michael; Burbank, Douglas; Alsdorf, Douglas</p> <p>2007-06-01</p> <p>The Shuttle <span class="hlt">Radar</span> Topography Mission produced the most complete, highest-resolution digital elevation model of the Earth. The project was a joint endeavor of NASA, the National Geospatial-Intelligence Agency, and the German and Italian Space Agencies and flew in February 2000. It used dual <span class="hlt">radar</span> antennas to acquire interferometric <span class="hlt">radar</span> data, processed to digital topographic data at 1 arc sec resolution. Details of the development, flight operations, data processing, and products are provided for users of this revolutionary data set.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19910017742','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19910017742"><span id="translatedtitle"><span class="hlt">Radar</span>-aeolian roughness project</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Greeley, Ronald; Dobrovolskis, A.; Gaddis, L.; Iversen, J. D.; Lancaster, N.; Leach, Rodman N.; Rasnussen, K.; Saunders, S.; Vanzyl, J.; Wall, S.</p> <p>1991-01-01</p> <p>The objective is to establish an empirical relationship between measurements of <span class="hlt">radar</span>, aeolian, and surface roughness on a variety of natural surfaces and to understand the underlying physical causes. This relationship will form the basis for developing a predictive equation to derive aeolian roughness from <span class="hlt">radar</span> backscatter. Results are given from investigations carried out in 1989 on the principal elements of the project, with separate sections on field studies, <span class="hlt">radar</span> data analysis, laboratory simulations, and development of theory for planetary applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19750004472','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19750004472"><span id="translatedtitle"><span class="hlt">Radar</span> studies of bird migration</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Williams, T. C.; Williams, J. M.</p> <p>1974-01-01</p> <p>Observations of bird migration with NASA <span class="hlt">radars</span> were made at Wallops Island, Va. Simultaneous observations were made at a number of <span class="hlt">radar</span> sites in the North Atlantic Ocean in an effort to discover what happened to those birds that were observed leaving the coast of North America headed toward Bermuda, the Caribbean and South America. Transatlantic migration, utilizing observations from a large number of <span class="hlt">radars</span> is discussed. Detailed studies of bird movements at Wallops Island are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/1232114-python-arm-radar-toolkit','SCIGOV-ESTSC'); return false;" href="http://www.osti.gov/scitech/biblio/1232114-python-arm-radar-toolkit"><span id="translatedtitle">Python-ARM <span class="hlt">Radar</span> Toolkit</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech/">Energy Science and Technology Software Center (ESTSC)</a></p> <p></p> <p>2013-03-17</p> <p>The Python-ARM <span class="hlt">Radar</span> Toolkit (Py-ART) is a collection of <span class="hlt">radar</span> quality control and retrieval codes which all work on two unifying Python objects: the Py<span class="hlt">Radar</span> and PyGrid objects. By building ingests to several popular <span class="hlt">radar</span> formats and then abstracting the interface Py-ART greatly simplifies data processing over several other available utilities. In addition Py-ART makes use of Numpy arrays as its primary storage mechanism enabling use of existing and extensive community software tools.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_12 --> <div id="page_13" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="241"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title47-vol5/pdf/CFR-2014-title47-vol5-sec80-273.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title47-vol5/pdf/CFR-2014-title47-vol5-sec80-273.pdf"><span id="translatedtitle">47 CFR 80.273 - <span class="hlt">Radar</span> standards.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...Telecommunication 5 2014-10-01 2014-10-01 false <span class="hlt">Radar</span> standards. 80.273 Section 80.273 Telecommunication...Authorization for Compulsory Ships § 80.273 <span class="hlt">Radar</span> standards. (a) <span class="hlt">Radar</span> installations on board ships that are...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title47-vol5/pdf/CFR-2013-title47-vol5-sec80-273.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title47-vol5/pdf/CFR-2013-title47-vol5-sec80-273.pdf"><span id="translatedtitle">47 CFR 80.273 - <span class="hlt">Radar</span> standards.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...Telecommunication 5 2013-10-01 2013-10-01 false <span class="hlt">Radar</span> standards. 80.273 Section 80.273 Telecommunication...Authorization for Compulsory Ships § 80.273 <span class="hlt">Radar</span> standards. (a) <span class="hlt">Radar</span> installations on board ships that are...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title47-vol5/pdf/CFR-2012-title47-vol5-sec80-273.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title47-vol5/pdf/CFR-2012-title47-vol5-sec80-273.pdf"><span id="translatedtitle">47 CFR 80.273 - <span class="hlt">Radar</span> standards.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...Telecommunication 5 2012-10-01 2012-10-01 false <span class="hlt">Radar</span> standards. 80.273 Section 80.273 Telecommunication...Authorization for Compulsory Ships § 80.273 <span class="hlt">Radar</span> standards. (a) <span class="hlt">Radar</span> installations on board ships that are...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cimms.ou.edu/~lakshman/Papers/radarcompression.pdf','EPRINT'); return false;" href="http://cimms.ou.edu/~lakshman/Papers/radarcompression.pdf"><span id="translatedtitle">Overview of <span class="hlt">Radar</span> Data Compression Valliappa Lakshmanan</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Lakshmanan, Valliappa</p> <p></p> <p>Overview of <span class="hlt">Radar</span> Data Compression Valliappa Lakshmanan Cooperative Institute of Mesoscale Meteorological Studies University of Oklahoma & National Severe Storms Laboratory Abstract <span class="hlt">Radar</span> data is routinely transmitted in real-time from the coterminous United States (CONUS) <span class="hlt">radar</span> sites and placed</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ittc.ku.edu/publications/documents/Allen1995_Allen1995GRSSNpp6.pdf','EPRINT'); return false;" href="http://www.ittc.ku.edu/publications/documents/Allen1995_Allen1995GRSSNpp6.pdf"><span id="translatedtitle">REVIEW ARTICLE Interferometric Synthetic Aperture <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Kansas, University of</p> <p></p> <p>REVIEW ARTICLE Interferometric Synthetic Aperture <span class="hlt">Radar</span> Christopher T. Allen Department of Electrical Engineering and Computer Science and <span class="hlt">Radar</span> Systems and Remote Sensing Laboratory University of Kansas Abstract. This paper provides a brief review of interferometric synthetic aperture <span class="hlt">radar</span> (In</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009LPI....40.1916J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009LPI....40.1916J"><span id="translatedtitle">Anomolous <span class="hlt">Radar</span> Backscatter from Titan's Xanadu</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Janssen, M. A.; Le Gall, A.; Wye, L. C.; Zebker, H. A.; Lorenz, R. D.; Paillou, P.; Paganelli, F.; Cassini RADAR Team</p> <p>2009-03-01</p> <p>We use simultaneously measured <span class="hlt">radar</span> reflectivity and microwave emission from the Cassini <span class="hlt">Radar</span> instrument to show that the <span class="hlt">radar</span> backscattering seen across Titan's Xanadu region is too high to be explained by any known surface model.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20100021285','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20100021285"><span id="translatedtitle"><span class="hlt">Interferometer</span> for Low-Uncertainty Vector Metrology</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Toland, Ronald W.; Leviton, Douglas B.</p> <p>2006-01-01</p> <p>A simplified schematic diagram of a tilt-sensing unequal-path <span class="hlt">interferometer</span> set up to measure the orientation of the normal vector of one surface of a cube mounted on a structure under test is described herein. This <span class="hlt">interferometer</span> has been named a "theoferometer" to express both its interferometric nature and the intention to use it instead of an autocollimating theodolite. The theoferometer optics are mounted on a plate, which is in turn mounted on orthogonal air bearings for near-360 rotation in azimuth and elevation. Rough alignment of the theoferometer to the test cube is done by hand, with fine position adjustment provided by a tangent arm drive using linear inchwormlike motors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/20853506','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/20853506"><span id="translatedtitle">Heterodyne <span class="hlt">interferometer</span> with unequal path lengths</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kumar, Deepak; Bellan, Paul M.</p> <p>2006-08-15</p> <p>Laser interferometry is an extensively used diagnostic for plasma experiments. Existing plasma <span class="hlt">interferometers</span> are designed on the presumption that the scene and reference beam path lengths have to be equal, a requirement that is costly in both the number of optical components and the alignment complexity. It is shown here that having equal path lengths is not necessary, instead, what is required is that the path length difference be an even multiple of the laser cavity length. This assertion has been verified in a heterodyne laser <span class="hlt">interferometer</span> that measures typical line-average densities of {approx}10{sup 21}/m{sup 2} with an error of {approx}10{sup 19}/m{sup 2}.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005AIPC..803..146B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005AIPC..803..146B"><span id="translatedtitle">Bayesian Analysis of Stellar Optical <span class="hlt">Interferometer</span> Data</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Benson, J. A.</p> <p>2005-11-01</p> <p>I describe a work in progress that uses Bayes' theorem, model selection, and marginalization in the analysis of photon count data frames from a stellar optical <span class="hlt">interferometer</span> (the Navy Prototype Optical <span class="hlt">Interferometer</span>). These data frames in general have between 1-6 stellar fringes (baselines) present. I show how Bayes factors provide a direct way of determining the number of fringes that are present in each data frame. I describe briefly the traditional Fourier-based technique for computing optical interferometry data products. A Bayesian approach, in addition to providing model selection directly from the data frames, also provides a way of combining the computed data products from each data frame in a manner that intrinsically handles the varying SNRs between the data frames. I use simulated data to show comparisons between my Bayesian approach and the traditional Fourier-based technique for the analysis of such data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997PhDT.......128P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997PhDT.......128P"><span id="translatedtitle">A stellar <span class="hlt">interferometer</span> on the Moon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Porro, Irene</p> <p></p> <p>The work I present in this document has been divided into two main parts, the first one related to the IOTA project and the second one related to the study on the lunar <span class="hlt">interferometer</span>, and an introduction section. Each section can be read independently from the other, however they are presented following the logical order in which the research work has been developed. As a guide for the reader here I describe the content of each chapter, which represents the original contribution (except when it is specifically declared) to the research accomplished. This section consists in the Introduction itself, with a presentation of the motivations for this research work, and in the chapter Interferometry from the Earth and from the Moon. The first part of this chapter shows the performances which are expected to be reached by ground-based <span class="hlt">interferometers</span> (Colavita, 1992) by using adaptive optics systems (Beckers, 1993). The evaluation is made separately for the case of high resolution imaging and for high accuracy astrometric measurements. The most optimistic results expected for ground-based instruments determine the level of the performance that has to be required from a space <span class="hlt">interferometer</span> (both an orbiting and a lunar instrument). In the second part of the chapter I specifically deal with the case of a lunar <span class="hlt">interferometer</span>, which allows to put together the advantages o ered by a ground-based instrument (very long baseline, a stable platform) and those offered by the space environment (absence of atmospheric turbulence, long integration times, and wavelength range of observation from the ultraviolet to the far infrared). In order to evaluate the limits of the lunar <span class="hlt">interferometer</span>, I need to consider three subjects with which I did not explicitly dealt for the study on IOTA: the maximum length of the baseline (Tango and Twiss, 1974), the maximum integration time, and the performances obtainable at the minimum temperature of operation (Ridgway, 1990). The chapter ends with a list of the main reviews which deal with the scientific objectives of space and lunar interferometry. In Appendix A I present an introduction to the principles of optical stellar interferometry. This part is mainly derived by the study and re-elaboration of the contents of the following works: Armstrong et al. (1995), Shao and Colavita (1992), and Born and Wolf (1980). In this section I present the work I specifically developed within the IOTA project. This work allowed me to, directly or indirectly, acquire the theoretical and technical knowledge I then applied in the study on the lunar <span class="hlt">interferometer</span>. After having identified some of the main sources of systematic error for an <span class="hlt">interferometer</span>, I examined: the problem of the telescope alignment, the beamsplitter behaviour, the effects that thermal variations cause on the optics and their support structures. The results obtained in these analyses and the evaluations performed on the performances of other subsystems of the instrument, allowed me to proceed in the evaluation of the instrumental visibility loss for IOTA. In the first chapter (I) I present a general description of the IOTA instrument, avoiding a detailed description of each subsystem. When it is necessary, this is given in its appropriate context. The second chapter (II) is the result of the largest part of my work done on IOTA: the analisys of the alignment of each telescope of the <span class="hlt">interferometer</span>. A non-perfect alignment of the telescope optics causes a distortion of the wavefront coming from the observed object. The distortions affecting the wavefront are responsible for the corruption of the interference fringes produced by the instrument, and eventually of the astrophysics information derived from their analysis. In order to study the effect of the optics misalignment on the performances of IOTA, I wrote a program to simulate some misalignment conditions and to evaluate the wavefront aberration they cause. For each case considered, an interferogram is produced by simulating the interference of the distorted wavefront with a plane wavefront. Th</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/871971','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/871971"><span id="translatedtitle">Phase-shifting point diffraction <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Medecki, Hector (Berkeley, CA)</p> <p>1998-01-01</p> <p>Disclosed is a point diffraction <span class="hlt">interferometer</span> for evaluating the quality of a test optic. In operation, the point diffraction <span class="hlt">interferometer</span> includes a source of radiation, the test optic, a beam divider, a reference wave pinhole located at an image plane downstream from the test optic, and a detector for detecting an interference pattern produced between a reference wave emitted by the pinhole and a test wave emitted from the test optic. The beam divider produces separate reference and test beams which focus at different laterally separated positions on the image plane. The reference wave pinhole is placed at a region of high intensity (e.g., the focal point) for the reference beam. This allows reference wave to be produced at a relatively high intensity. Also, the beam divider may include elements for phase shifting one or both of the reference and test beams.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/675841','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/675841"><span id="translatedtitle">Phase-shifting point diffraction <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Medecki, H.</p> <p>1998-11-10</p> <p>Disclosed is a point diffraction <span class="hlt">interferometer</span> for evaluating the quality of a test optic. In operation, the point diffraction <span class="hlt">interferometer</span> includes a source of radiation, the test optic, a beam divider, a reference wave pinhole located at an image plane downstream from the test optic, and a detector for detecting an interference pattern produced between a reference wave emitted by the pinhole and a test wave emitted from the test optic. The beam divider produces separate reference and test beams which focus at different laterally separated positions on the image plane. The reference wave pinhole is placed at a region of high intensity (e.g., the focal point) for the reference beam. This allows reference wave to be produced at a relatively high intensity. Also, the beam divider may include elements for phase shifting one or both of the reference and test beams. 8 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20090020381','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20090020381"><span id="translatedtitle">Data Processing for Atmospheric Phase <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Acosta, Roberto J.; Nessel, James A.; Morabito, David D.</p> <p>2009-01-01</p> <p>This paper presents a detailed discussion of calibration procedures used to analyze data recorded from a two-element atmospheric phase <span class="hlt">interferometer</span> (API) deployed at Goldstone, California. In addition, we describe the data products derived from those measurements that can be used for site intercomparison and atmospheric modeling. Simulated data is used to demonstrate the effectiveness of the proposed algorithm and as a means for validating our procedure. A study of the effect of block size filtering is presented to justify our process for isolating atmospheric fluctuation phenomena from other system-induced effects (e.g., satellite motion, thermal drift). A simulated 24 hr <span class="hlt">interferometer</span> phase data time series is analyzed to illustrate the step-by-step calibration procedure and desired data products.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20040086908','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20040086908"><span id="translatedtitle">Adaptive DFT-based <span class="hlt">Interferometer</span> Fringe Tracking</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Wilson, Edward; Pedretti, Ettore; Bregman, Jesse; Mah, Robert W.; Traub, Wesley A.</p> <p>2004-01-01</p> <p>An automatic <span class="hlt">interferometer</span> fringe tracking system has been developed, implemented, and tested at the Infrared Optical Telescope Array (IOTA) observatory at Mt. Hopkins, Arizona. The system can minimize the optical path differences (OPDs) for all three baselines of the Michelson stellar <span class="hlt">interferometer</span> at IOTA. Based on sliding window discrete Fourier transform (DFT) calculations that were optimized for computational efficiency and robustness to atmospheric disturbances, the algorithm has also been tested extensively on off-line data. Implemented in ANSI C on the 266 MHz PowerPC processor running the VxWorks real-time operating system, the algorithm runs in approximately 2.0 milliseconds per scan (including all three interferograms), using the science camera and piezo scanners to measure and correct the OPDs. The adaptive DFT-based tracking algorithm should be applicable to other systems where there is a need to detect or track a signal with an approximately constant-frequency carrier pulse.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0911.3090v2','EPRINT'); return false;" href="http://arxiv.org/pdf/0911.3090v2"><span id="translatedtitle">Thermal-noise-limited underground <span class="hlt">interferometer</span> CLIO</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Kazuhiro Agatsuma; Koji Arai; Masa-Katsu Fujimoto; Seiji Kawamura; Kazuaki Kuroda; Osamu Miyakawa; Shinji Miyoki; Masatake Ohashi; Toshikazu Suzuki; Ryutaro Takahashi; Daisuke Tatsumi; Souichi Telada; Takashi Uchiyama; Kazuhiro Yamamoto; CLIO collaborators</p> <p>2010-01-29</p> <p>We report on the current status of CLIO (Cryogenic Laser <span class="hlt">Interferometer</span> Observatory), which is a prototype <span class="hlt">interferometer</span> for LCGT (Large Scale Cryogenic Gravitational-Wave Telescope). LCGT is a Japanese next-generation interferometric gravitational wave detector featuring the use of cryogenic mirrors and a quiet underground site. The main purpose of CLIO is to demonstrate a reduction of the mirror thermal noise by cooling the sapphire mirrors. CLIO is located in an underground site of the Kamioka mine, 1000 m deep from the mountain top, to verify its advantages. After a few years of commissioning work, we have achieved a thermal-noise-limited sensitivity at room temperature. One of the main results of noise hunting was the elimination of thermal noise caused by a conductive coil-holder coupled with a pendulum through magnets.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22072165','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22072165"><span id="translatedtitle">Analysis of a free oscillation atom <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kafle, Rudra P.; Zozulya, Alex A.; Anderson, Dana Z.</p> <p>2011-09-15</p> <p>We analyze a Bose-Einstein condensate (BEC)-based free oscillation atom Michelson <span class="hlt">interferometer</span> in a weakly confining harmonic magnetic trap. A BEC at the center of the trap is split into two harmonics by a laser standing wave. The harmonics move in opposite directions with equal speeds and turn back under the influence of the trapping potential at their classical turning points. The harmonics are allowed to pass through each other and a recombination pulse is applied when they overlap at the end of a cycle after they return for the second time. We derive an expression for the contrast of the interferometric fringes and obtain the fundamental limit of performance of the <span class="hlt">interferometer</span> in the parameter space.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/gr-qc/9909080v2','EPRINT'); return false;" href="http://arxiv.org/pdf/gr-qc/9909080v2"><span id="translatedtitle">Sensitivity curves for spaceborne gravitational wave <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Shane L. Larson; William A. Hiscock; Ronald W. Hellings</p> <p>2000-01-10</p> <p>To determine whether particular sources of gravitational radiation will be detectable by a specific gravitational wave detector, it is necessary to know the sensitivity limits of the instrument. These instrumental sensitivities are often depicted (after averaging over source position and polarization) by graphing the minimal values of the gravitational wave amplitude detectable by the instrument versus the frequency of the gravitational wave. This paper describes in detail how to compute such a sensitivity curve given a set of specifications for a spaceborne laser <span class="hlt">interferometer</span> gravitational wave observatory. Minor errors in the prior literature are corrected, and the first (mostly) analytic calculation of the gravitational wave transfer function is presented. Example sensitivity curve calculations are presented for the proposed LISA <span class="hlt">interferometer</span>. We find that previous treatments of LISA have underestimated its sensitivity by a factor of $\\sqrt{3}$.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cds.cern.ch/record/401623/files/9909080.pdf','EPRINT'); return false;" href="http://cds.cern.ch/record/401623/files/9909080.pdf"><span id="translatedtitle">Sensitivity curves for spaceborne gravitational wave <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Larson, S L; Hellings, R W; Larson, Shane L.; Hiscock, William A.; Hellings, Ronald W.</p> <p>2000-01-01</p> <p>To determine whether particular sources of gravitational radiation will be detectable by a specific gravitational wave detector, it is necessary to know the sensitivity limits of the instrument. These instrumental sensitivities are often depicted (after averaging over source position and polarization) by graphing the minimal values of the gravitational wave amplitude detectable by the instrument versus the frequency of the gravitational wave. This paper describes in detail how to compute such a sensitivity curve given a set of specifications for a spaceborne laser <span class="hlt">interferometer</span> gravitational wave observatory. Minor errors in the prior literature are corrected, and the first (mostly) analytic calculation of the gravitational wave transfer function is presented. Example sensitivity curve calculations are presented for the proposed LISA <span class="hlt">interferometer</span>. We find that previous treatments of LISA have underestimated its sensitivity by a factor of $\\sqrt{3}$.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/948372','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/948372"><span id="translatedtitle">Millimeter Wave Cloud <span class="hlt">Radar</span> (MMCR) Handbook</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>KB Widener; K Johnson</p> <p>2005-01-30</p> <p>The millimeter cloud <span class="hlt">radar</span> (MMCR) systems probe the extent and composition of clouds at millimeter wavelengths. The MMCR is a zenith-pointing <span class="hlt">radar</span> that operates at a frequency of 35 GHz. The main purpose of this <span class="hlt">radar</span> is to determine cloud boundaries (e.g., cloud bottoms and tops). This <span class="hlt">radar</span> will also report <span class="hlt">radar</span> reflectivity (dBZ) of the atmosphere up to 20 km. The <span class="hlt">radar</span> possesses a doppler capability that will allow the measurement of cloud constituent vertical velocities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20208642','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20208642"><span id="translatedtitle">Large aperture ac <span class="hlt">interferometer</span> for optical testing.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Moore, D T; Murray, R; Neves, F B</p> <p>1978-12-15</p> <p>A 20-cm clear aperture modified Twyman-Green <span class="hlt">interferometer</span> is described. The system measures phase with an AC technique called phase-lock interferometry while scanning the aperture with a dual galvanometer scanning system. Position information and phase are stored in a minicomputer with disk storage. This information is manipulated with associated software, and the wavefront deformation due to a test component is graphically displayed in perspective and contour on a CRT terminal. PMID:20208642</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_13 --> <div id="page_14" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="261"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013SPIE.8882E..0MA','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013SPIE.8882E..0MA"><span id="translatedtitle">Optical tweezers based on polarization <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Angelsky, Oleg V.; Maksimyak, Andrew P.; Maksimyak, Peter P.; Dominikov, Mykola M.</p> <p>2013-06-01</p> <p>In this paper, we propose optical tweezers based on a biaxial crystal. To control the movement of opaque particles, we use the shift polarization <span class="hlt">interferometer</span>. The results of experimental study of laser tweezers are shown. We demonstrates movement of a microparticle of toner using singular-optical trap, rotate a particle due to orbital momentum, conversion of two traps when changing the plane of polarizer transmission and converging of two traps.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhB...48s5002S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhB...48s5002S"><span id="translatedtitle">Matter-wave interferometry: towards antimatter <span class="hlt">interferometers</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sala, Simone; Castelli, Fabrizio; Giammarchi, Marco; Siccardi, Stefano; Olivares, Stefano</p> <p>2015-10-01</p> <p>Starting from an elementary model and refining it to take into account more realistic effects, we discuss the limitations and advantages of matter-wave interferometry in different configurations. We focus on the possibility to apply this approach to scenarios involving antimatter, such as positrons and positronium atoms. In particular, we investigate the Talbot-Lau <span class="hlt">interferometer</span> with material gratings and discuss in details the results in view of the possible experimental verification.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/957002','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/957002"><span id="translatedtitle">Removing interfering clutter associated with <span class="hlt">radar</span> pulses that an airborne <span class="hlt">radar</span> receives from a <span class="hlt">radar</span> transponder</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Ormesher, Richard C. (Albuquerque, NM); Axline, Robert M. (Albuquerque, NM)</p> <p>2008-12-02</p> <p>Interfering clutter in <span class="hlt">radar</span> pulses received by an airborne <span class="hlt">radar</span> system from a <span class="hlt">radar</span> transponder can be suppressed by developing a representation of the incoming echo-voltage time-series that permits the clutter associated with predetermined parts of the time-series to be estimated. These estimates can be used to estimate and suppress the clutter associated with other parts of the time-series.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930050642&hterms=aperture+synthesis+imaging&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Daperture%2Bsynthesis%2Bimaging','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930050642&hterms=aperture+synthesis+imaging&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Daperture%2Bsynthesis%2Bimaging"><span id="translatedtitle">Orbiting stellar <span class="hlt">interferometer</span> for astrometry and imaging</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Colavita, M. M.; Shao, M.; Rayman, M. D.</p> <p>1993-01-01</p> <p>The orbiting stellar <span class="hlt">interferometer</span> (OSI) is a concept for a first-generation space <span class="hlt">interferometer</span> with astrometric and imaging goals. The OSI is a triple Michelson <span class="hlt">interferometer</span> with articulating siderostats and optical delay lines. Two point designs for the instrument are described. The 18-m design uses an 18-m maximum baseline and aperture diameters of 40 cm; the targeted astrometric performance is a wide-field accuracy of 10 microarsec for 16-mag objects in 100 s of integration time and for 20-mag objects in 1 h. The instrument would also be capable of synthesis imaging with a resolution of 5 marcsec, which corresponds to the diffraction limit of the 18-m base line. The design uses a deployed structure, which would fold to fit into an Atlas IIAS shroud, for insertion into a 900-km sun-synchronous orbit. In addition to the 18-m point design, a 7-m point design that uses a shorter base line in order to simplify deployment is also discussed. OSI's high performance is made possible by utilizing laser metrology and controlled-optics technology.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/912160','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/912160"><span id="translatedtitle">Photorefractive <span class="hlt">Interferometers</span> for Ultrasonic Measurements on Paper</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lafond, E. F.; Brodeur, P. H.; Gerhardstein, J. P.; Habeger, C. C.; Telschow, Kenneth Louis</p> <p>2002-12-01</p> <p>Photorefractive <span class="hlt">interferometers</span> have been employed for the detection of ultrasound in metals and composites since 1991 [1–4]. Instances of laser-generated ultrasound and laser-based detection in paper were reported in 1996 [5]. More recently, bismuth silicon oxide (BSO) photorefractive <span class="hlt">interferometers</span> were adapted to detect ultrasound in paper [6]. In this article we discuss BSO and GaAs photorefractive detection of ultrasound on different paper grades and present the resulting waveforms. Compared to contact piezoelectric transducer methods, laser interferometry offers signifcant advantages. One of these is that it is a noncontact technique. This is especially important for on-line application to lightweight papers which could be marked or damaged by contact transducers. Broadband ultrasonic laser generation matched with the broadband sensitivity of laser <span class="hlt">interferometers</span> is another beneft. This is important for obtaining narrow pulses in nondispersive time-of-fight determinations and for measuring the phase velocity of dispersive modes over a wide frequency band. Also, laser ultrasonic techniques provide a measure of bending stiffness through the analysis of low frequency A0 waves.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20030016517','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20030016517"><span id="translatedtitle">A Study of Imaging <span class="hlt">Interferometer</span> Simulators</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Allen, Ronald J.</p> <p>2002-01-01</p> <p>Several new space science mission concepts under development at NASA-GSFC for astronomy are intended to carry out synthetic imaging using Michelson <span class="hlt">interferometers</span> or direct (Fizeau) imaging with sparse apertures. Examples of these mission concepts include the Stellar Imager (SI), the Space Infrared Interferometric Telescope (SPIRIT), the Submillimeter Probe of the Evolution of Cosmic Structure (SPECS), and the Fourier-Kelvin Stellar <span class="hlt">Interferometer</span> (FKSI). We have been developing computer-based simulators for these missions. These simulators are aimed at providing a quantitative evaluation of the imaging capabilities of the mission by modelling the performance on different realistic targets in terms of sensitivity, angular resolution, and dynamic range. Both Fizeau and Michelson modes of operation can be considered. Our work is based on adapting a computer simulator called imSIM, which was initially written for the Space <span class="hlt">Interferometer</span> Mission in order to simulate the imaging mode of new missions such as those listed. In a recent GSFC-funded study we have successfully written a preliminary version of a simulator SISIM for the Stellar Imager and carried out some preliminary studies with it. In a separately funded study we have also been applying these methods to SPECS/SPIRIT.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012PhRvD..85f4007H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012PhRvD..85f4007H"><span id="translatedtitle"><span class="hlt">Interferometers</span> as probes of Planckian quantum geometry</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hogan, Craig J.</p> <p>2012-03-01</p> <p>A theory of position of massive bodies is proposed that results in an observable quantum behavior of geometry at the Planck scale, tP. Departures from classical world lines in flat spacetime are described by Planckian noncommuting operators for position in different directions, as defined by interactions with null waves. The resulting evolution of position wave functions in two dimensions displays a new kind of directionally coherent quantum noise of transverse position. The amplitude of the effect in physical units is predicted with no parameters, by equating the number of degrees of freedom of position wave functions on a 2D space-like surface with the entropy density of a black hole event horizon of the same area. In a region of size L, the effect resembles spatially and directionally coherent random transverse shear deformations on time scale ?L/c with typical amplitude ?ctPL. This quantum-geometrical “holographic noise” in position is not describable as fluctuations of a quantized metric, or as any kind of fluctuation, dispersion or propagation effect in quantum fields. In a Michelson <span class="hlt">interferometer</span> the effect appears as noise that resembles a random Planckian walk of the beam splitter for durations up to the light-crossing time. Signal spectra and correlation functions in <span class="hlt">interferometers</span> are derived, and predicted to be comparable with the sensitivities of current and planned experiments. It is proposed that nearly colocated Michelson <span class="hlt">interferometers</span> of laboratory scale, cross-correlated at high frequency, can test the Planckian noise prediction with current technology.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MeScT..26h4009B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MeScT..26h4009B"><span id="translatedtitle">MIKES’ primary phase stepping gauge block <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Byman, V.; Lassila, A.</p> <p>2015-08-01</p> <p>MIKES’ modernized phase stepping <span class="hlt">interferometer</span> for gauge block calibration (PSIGB) will be described. The instrument is based on the well-regarded NPL-TESA gauge block <span class="hlt">interferometer</span> from 1994. The decision to upgrade the instrument resulted from several components, such as the PC and charge-coupled device (CCD) camera, having reached the end of their lifetime. In this paper modernized components, measurement method and analysis will be explained. The lasers are coupled to the instrument using single mode fiber. The instrument uses phase stepping generated by an added optical window on a controllable rotatory table in the reference arm with a recently developed nine-position phase stepping algorithm. Unwrapping is done with a robust path following algorithm. Procedures for adjusting the <span class="hlt">interferometer</span> are explained. Determination and elimination of wavefront error, coherent noise and analysis of their influence on the results is described. Flatness and variation in length are also important parameters of gauge blocks to be characterized, and the corresponding analysis method is clarified. Uncertainty analysis for the central length, flatness and variation in length is also described. The results are compared against those of the old hardware and software. The standard uncertainty for central length measurement is u = [(9.5?nm)2 + (121 × 10-9?L)2]½, where L is measured length.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19820003100','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19820003100"><span id="translatedtitle">Planetary <span class="hlt">radar</span> studies. [<span class="hlt">radar</span> mapping of the Moon and <span class="hlt">radar</span> signatures of lunar and Venus craters</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Thompson, T. W.; Cutts, J. A.</p> <p>1981-01-01</p> <p>Progress made in studying the evolution of Venusian craters and the evolution of infrared and <span class="hlt">radar</span> signatures of lunar crater interiors is reported. Comparison of <span class="hlt">radar</span> images of craters on Venus and the Moon present evidence for a steady state Venus crater population. Successful observations at the Arecibo Observatory yielded good data on five nights when data for a mix of inner and limb areas were acquired. Lunar craters with <span class="hlt">radar</span> bright ejects are discussed. An overview of infrared <span class="hlt">radar</span> crater catalogs in the data base is included.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JPhCS.214a2088T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JPhCS.214a2088T"><span id="translatedtitle">Thermal-wave <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tabatabaei, N.; Mandelis, A.</p> <p>2010-03-01</p> <p>Using matched-filtering principles and linear frequency modulation a powerful photothermal depth-profilometry method is introduced. Unlike FD-PTR, in thermal-wave <span class="hlt">radar</span> (TWR) the frequency of the optical excitation increases linearly within the chirp period, enabling the method to scan a depth range in a single iteration. Simulations and experimental results suggest a significant improvement in the dynamic range when using TWR instead of conventional PTR. Analytical solutions to the TWR heat diffusion problem for both opaque and transparent solids are provided.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/gr-qc/0008026v2','EPRINT'); return false;" href="http://arxiv.org/pdf/gr-qc/0008026v2"><span id="translatedtitle">Conversion of conventional gravitational-wave <span class="hlt">interferometers</span> into QND <span class="hlt">interferometers</span> by modifying their input and/or output optics</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>H. J. Kimble; Yuri Levin; Andrey B. Matsko; Kip S. Thorne; Sergey P. Vyatchanin</p> <p>2001-09-03</p> <p>The LIGO-II gravitational-wave <span class="hlt">interferometers</span> (ca. 2006--2008) are designed to have sensitivities at about the standard quantum limit (SQL) near 100 Hz. This paper describes and analyzes possible designs for subsequent, LIGO-III <span class="hlt">interferometers</span> that can beat the SQL. These designs are identical to a conventional broad-band <span class="hlt">interferometer</span> (without signal recycling), except for new input and/or output optics. Three designs are analyzed: (i) a "squeezed-input <span class="hlt">interferometer</span>" (conceived by Unruh based on earlier work of Caves) in which squeezed vacuum with frequency-dependent (FD) squeeze angle is injected into the <span class="hlt">interferometer</span>'s dark port; (ii) a "variational-output" <span class="hlt">interferometer</span> (conceived in a different form by Vyatchanin, Matsko and Zubova), in which homodyne detection with FD homodyne phase is performed on the output light; and (iii) a "squeezed-variational <span class="hlt">interferometer</span>" with squeezed input and FD-homodyne output. It is shown that the FD squeezed-input light can be produced by sending ordinary squeezed light through two successive Fabry-Perot filter cavities before injection into the <span class="hlt">interferometer</span>, and FD-homodyne detection can be achieved by sending the output light through two filter cavities before ordinary homodyne detection. With anticipated technology and with laser powers comparable to that planned for LIGO-II, these <span class="hlt">interferometers</span> can beat the amplitude SQL by factors in the range from 3 to 5, corresponding to event rate increases between ~30 and ~100 over the rate for a SQL-limited <span class="hlt">interferometer</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20060035923&hterms=Hunt&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAuthor-Name%26N%3D0%26No%3D90%26Ntt%3DHunt','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20060035923&hterms=Hunt&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAuthor-Name%26N%3D0%26No%3D90%26Ntt%3DHunt"><span id="translatedtitle">Imaging <span class="hlt">Radar</span> for Ecosystem Studies</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Waring, Richard H.; Way, JoBea; Hunt, E. Raymond J.; Morrissey, Leslie; Ranson, K. Jon; Weishampel, John F.; Oren, Ram; Franklin, Steven E.</p> <p>1996-01-01</p> <p>Recently a number of satellites have been launched with <span class="hlt">radar</span> sensors, thus expanding opportunities for global assessment. In this article we focus on the applications of imaging <span class="hlt">radar</span>, which is a type of sensor that actively generates pulses of microwaves and, in the interval between sending pulses, records the returning signals reflected back to an antenna.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/21772398','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21772398"><span id="translatedtitle">Development of stable monolithic wide-field Michelson <span class="hlt">interferometers</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wan, Xiaoke; Ge, Jian; Chen, Zhiping</p> <p>2011-07-20</p> <p>Bulk wide-field Michelson <span class="hlt">interferometers</span> are very useful for high precision applications in remote sensing and astronomy. A stable monolithic Michelson <span class="hlt">interferometer</span> is a key element in high precision radial velocity (RV) measurements for extrasolar planets searching and studies. Thermal stress analysis shows that matching coefficients of thermal expansion (CTEs) is a critical requirement for ensuring <span class="hlt">interferometer</span> stability. This requirement leads to a novel design using BK7 and LAK7 materials, such that the monolithic <span class="hlt">interferometer</span> is free from thermal distortion. The processes of design, fabrication, and testing of <span class="hlt">interferometers</span> are described in detail. In performance evaluations, the field angle is typically 23.8° and thermal sensitivity is typically -2.6×10(-6)/°C near 550 nm, which corresponds to ?800 m/s/°C in the RV scale. Low-cost <span class="hlt">interferometer</span> products have been commissioned in multiple RV instruments, and they are producing high stability performance over long term operations. PMID:21772398</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SPIE.9461E..13L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SPIE.9461E..13L"><span id="translatedtitle">Low-brightness quantum <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lanzagorta, Marco</p> <p>2015-05-01</p> <p>One of the major scientific thrusts from recent years has been to try to harness quantum phenomena to dramatically increase the performance of a wide variety of classical information processing devices. These advances in quantum information science have had a considerable impact on the development of standoff sensors such as quantum <span class="hlt">radar</span>. In this paper we analyze the theoretical performance of low-brightness quantum <span class="hlt">radar</span> that uses entangled photon states. We use the detection error probability as a measure of sensing performance and the interception error probability as a measure of stealthiness. We compare the performance of quantum <span class="hlt">radar</span> against a coherent light sensor (such as lidar) and classical <span class="hlt">radar</span>. In particular, we restrict our analysis to the performance of low-brightness standoff sensors operating in a noisy environment. We show that, compared to the two classical standoff sensing devices, quantum <span class="hlt">radar</span> is stealthier, more resilient to jamming, and more accurate for the detection of low reflectivity targets.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19840030822&hterms=perpetual&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dperpetual','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19840030822&hterms=perpetual&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dperpetual"><span id="translatedtitle">Shuttle Imaging <span class="hlt">Radar</span> - Geologic applications</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Macdonald, H.; Bridges, L.; Waite, W.; Kaupp, V.</p> <p>1982-01-01</p> <p>The Space Shuttle, on its second flight (November 12, 1981), carried the first science and applications payload which provided an early demonstration of Shuttle's research capabilities. One of the experiments, the Shuttle Imaging <span class="hlt">Radar</span>-A (SIR-A), had as a prime objective to evaluate the capability of spaceborne imaging <span class="hlt">radars</span> as a tool for geologic exploration. The results of the experiment will help determine the value of using the combination of space <span class="hlt">radar</span> and Landsat imagery for improved geologic analysis and mapping. Preliminary analysis of the Shuttle <span class="hlt">radar</span> imagery with Seasat and Landsat imagery from similar areas provides evidence that spaceborne <span class="hlt">radars</span> can significantly complement Landsat interpretation, and vastly improve geologic reconnaissance mapping in those areas of the world that are relatively unmapped because of perpetual cloud cover.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19840045720&hterms=image+registration&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dimage%2Bregistration','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19840045720&hterms=image+registration&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dimage%2Bregistration"><span id="translatedtitle"><span class="hlt">Radar</span> image registration and rectification</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Naraghi, M.; Stromberg, W. D.</p> <p>1983-01-01</p> <p>Two techniques for <span class="hlt">radar</span> image registration and rectification are presented. In the registration method, a general 2-D polynomial transform is defined to accomplish the geometric mapping from one image into the other. The degree and coefficients of the polynomial are obtained using an a priori found tiepoint data set. In the second part of the paper, a rectification procedure is developed that models the distortion present in the <span class="hlt">radar</span> image in terms of the <span class="hlt">radar</span> sensor's platform parameters and the topographic variations of the imaged scene. This model, the ephemeris data and the digital topographic data are then used in rectifying the <span class="hlt">radar</span> image. The two techniques are then used in registering and rectifying two examples of <span class="hlt">radar</span> imagery. Each method is discussed as to its benefits, shortcomings and registration accuracy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011EJASP2011...71C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011EJASP2011...71C"><span id="translatedtitle"><span class="hlt">Radar</span> SLAM using visual features</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Callmer, Jonas; Törnqvist, David; Gustafsson, Fredrik; Svensson, Henrik; Carlbom, Pelle</p> <p>2011-12-01</p> <p>A vessel navigating in a critical environment such as an archipelago requires very accurate movement estimates. Intentional or unintentional jamming makes GPS unreliable as the only source of information and an additional independent supporting navigation system should be used. In this paper, we suggest estimating the vessel movements using a sequence of <span class="hlt">radar</span> images from the preexisting body-fixed <span class="hlt">radar</span>. Island landmarks in the <span class="hlt">radar</span> scans are tracked between multiple scans using visual features. This provides information not only about the position of the vessel but also of its course and velocity. We present here a navigation framework that requires no additional hardware than the already existing naval <span class="hlt">radar</span> sensor. Experiments show that visual <span class="hlt">radar</span> features can be used to accurately estimate the vessel trajectory over an extensive data set.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20150008604&hterms=Habitable+planets&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DHabitable%2Bplanets','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20150008604&hterms=Habitable+planets&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DHabitable%2Bplanets"><span id="translatedtitle">Terrestrial Planet Finder <span class="hlt">Interferometer</span>: 2007-2008 Progress and Plans</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lawson, P. R.; Lay, O. P.; Martin, S. R.; Peters, R. D.; Gappinger, R. O.; Ksendzov, A.; Scharf, D. P.; Booth, A. J.; Beichman, C. A.; Serabyn, E.; Johnston, K. J.; Danchi, W. C.</p> <p>2008-01-01</p> <p>This paper provides an overview of technology development for the Terrestrial Planet Finder <span class="hlt">Interferometer</span> (TPF-I). TPF-I is a mid-infrared space <span class="hlt">interferometer</span> being designed with the capability of detecting Earth-like planets in the habitable zones around nearby stars. The overall technology roadmap is presented and progress with each of the testbeds is summarized. The current <span class="hlt">interferometer</span> architecture, design trades, and the viability of possible reduced-scope mission concepts are also presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110012245','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110012245"><span id="translatedtitle">Gravitational Wave Detection with Single-Laser Atom <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Yu, Nan; Tinto, Massimo</p> <p>2011-01-01</p> <p>A new design for a broadband detector of gravitational radiation relies on two atom <span class="hlt">interferometers</span> separated by a distance L. In this scheme, only one arm and one laser are used for operating the two atom <span class="hlt">interferometers</span>. The innovation here involves the fact that the atoms in the atom <span class="hlt">interferometers</span> are not only considered as perfect test masses, but also as highly stable clocks. Atomic coherence is intrinsically stable, and can be many orders of magnitude more stable than a laser.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SPIE.9677E..0GH','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SPIE.9677E..0GH"><span id="translatedtitle">Modeling Fizeau <span class="hlt">interferometer</span> based on ray tracing with Zemax</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>He, Yiwei; Hou, Xi; Wu, Yongqian; Wu, Fan; Quan, Haiyang; Liu, Fengwei</p> <p>2015-10-01</p> <p>A convenient method to study the influence of error sources in Fizeau is to build a ray-tracing model to simulate the error sources. In this paper an <span class="hlt">interferometer</span> model is presented; an extension program is called to simulate the interference; and a preliminary research of several error sources is conducted. These examples demonstrate error analysis based on <span class="hlt">interferometer</span> models is feasible and provide some guidance for optimizing our <span class="hlt">interferometer</span> design.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_14 --> <div id="page_15" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="281"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20936004','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20936004"><span id="translatedtitle">New integrated-optics <span class="hlt">interferometer</span> in planar technology.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Duport, I S; Benech, P; Rimet, R</p> <p>1994-09-01</p> <p>Glass ion exchange is an attractive method for fabricating integrated optical components. We investigate the feasibility of making a single-mode glass ion-exchanged <span class="hlt">interferometer</span> designed especially to obtain an interference pattern. The design of the <span class="hlt">interferometer</span> is based on the use of tapered waveguides to obtain a collimated beam. This <span class="hlt">interferometer</span> could be used as a chemical or biological sensor. PMID:20936004</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19850020482','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19850020482"><span id="translatedtitle">Special topics in infrared interferometry. [Michelson <span class="hlt">interferometer</span> development</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hanel, R. A.</p> <p>1985-01-01</p> <p>Topics in IR interferometry related to the development of a Michelson <span class="hlt">interferometer</span> are treated. The selection and reading of the signal from the detector to the analog to digital converter is explained. The requirements for the Michelson <span class="hlt">interferometer</span> advance speed are deduced. The effects of intensity modulation on the interferogram are discussed. Wavelength and intensity calibration of the <span class="hlt">interferometer</span> are explained. Noise sources (Nyquist or Johnson noise, phonon noise), definitions of measuring methods of noise, and noise measurements are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20020074734&hterms=community+solar&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dcommunity%2Bsolar','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20020074734&hterms=community+solar&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dcommunity%2Bsolar"><span id="translatedtitle">Mars <span class="hlt">Radar</span> Observations with the Goldstone Solar System <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Haldemann, A. F. C.; Jurgens, R. F.; Larsen, K. W.; Arvidson, R. E.; Slade, M. A.</p> <p>2002-01-01</p> <p>The Goldstone Solar System <span class="hlt">Radar</span> (GSSR) has successfully collected <span class="hlt">radar</span> echo data from Mars over the past 30 years. As such, the GSSR has played a role as a specific mission element within Mars exploration. The older data provided local elevation information for Mars, along with <span class="hlt">radar</span> scattering information with global resolution. Since the upgrade to the 70-m Deep Space Network (DSN) antenna at Goldstone completed in 1986, Mars data has been collected during all but the 1997 Mars opposition. <span class="hlt">Radar</span> data, and non-imaging delay-Doppler data in particular, requires significant data processing to extract elevation, reflectivity and roughness of the reflecting surface. The spatial resolution of these experiments is typically some 20 km in longitude by some 150 km in latitude. The interpretation of these parameters while limited by the complexities of electromagnetic scattering, do provide information directly relevant to geophysical and geomorphic analyses of Mars. The usefulness of <span class="hlt">radar</span> data for Mars exploration has been demonstrated in the past. <span class="hlt">Radar</span> data were critical in assessing the Viking Lander 1 site as well as, more recently, the Pathfinder landing site. In general, <span class="hlt">radar</span> data have not been available to the Mars exploration community at large. A project funded initially by the Mars Exploration Directorate Science Office at the Jet Propulsion Laboratory (JPL), and later funded by NASA's Mars Data Analysis Program has reprocessed to a common format a decade's worth of raw GSSR Mars delay-Doppler data in aid of landing site characterization for the Mars Program. These data will soon be submitted to the Planetary Data System (PDS). The <span class="hlt">radar</span> data used were obtained between 1988 and 1995 by the GSSR, and comprise some 63 delay-Doppler <span class="hlt">radar</span> tracks. Of these, 15 have yet to be recovered from old 9-track tapes, and some of the data may be permanently lost.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www-das.uwyo.edu/~geerts/bart/erad_ihop.pdf','EPRINT'); return false;" href="http://www-das.uwyo.edu/~geerts/bart/erad_ihop.pdf"><span id="translatedtitle">Airborne Doppler <span class="hlt">radar</span> observations of convective plumes and <span class="hlt">radar</span> `fine-lines' ERAD02-A-00007</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Geerts, Bart</p> <p></p> <p>Airborne Doppler <span class="hlt">radar</span> observations of convective plumes and <span class="hlt">radar</span> `fine-lines' ERAD02-A-00007 Bart; email: geerts@uwyo.edu #12;Airborne Doppler <span class="hlt">radar</span> observations of convective plumes and <span class="hlt">radar</span> `fine-lines' Abstract Reflectivities and Doppler velocities from an airborne 95 GHz <span class="hlt">radar</span> are used to describe</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://twister.ou.edu/papers/MayRadarConf2005.pdf','EPRINT'); return false;" href="http://twister.ou.edu/papers/MayRadarConf2005.pdf"><span id="translatedtitle">P15R.1 THE DETECTABILITY OF TORNADIC SIGNATURES WITH DOPPLER <span class="hlt">RADAR</span>: A <span class="hlt">RADAR</span> EMULATOR STUDY</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Xue, Ming</p> <p></p> <p>P15R.1 THE DETECTABILITY OF TORNADIC SIGNATURES WITH DOPPLER <span class="hlt">RADAR</span>: A <span class="hlt">RADAR</span> EMULATOR STUDY Ryan M of WSR-88D (Weather Surveillance <span class="hlt">Radar</span>-1988 Doppler) scanning strategies on the sampling of mesocyclones describes a <span class="hlt">radar</span> emulator designed to simulate the returns from a scanning Doppler <span class="hlt">radar</span> on a pulse</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.uml.edu/docs/177_DeMartinis_AMTA_100GHzCR_tcm18-152587.pdf','EPRINT'); return false;" href="http://www.uml.edu/docs/177_DeMartinis_AMTA_100GHzCR_tcm18-152587.pdf"><span id="translatedtitle">A 100 GHz Polarimetric Compact <span class="hlt">Radar</span> Range for Scale-Model <span class="hlt">Radar</span> Cross Section Measurements</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Massachusetts at Lowell, University of</p> <p></p> <p>A 100 GHz Polarimetric Compact <span class="hlt">Radar</span> Range for Scale-Model <span class="hlt">Radar</span> Cross Section Measurements Guy B for obtaining <span class="hlt">radar</span> cross section, inverse synthetic aperture <span class="hlt">radar</span> imagery and high range resolution profiles-- A fully polarimetric compact <span class="hlt">radar</span> range operating at a center frequency of 100 GHz has been developed</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20100005262','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20100005262"><span id="translatedtitle">Measuring Cyclic Error in Laser Heterodyne <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Ryan, Daniel; Abramovici, Alexander; Zhao, Feng; Dekens, Frank; An, Xin; Azizi, Alireza; Chapsky, Jacob; Halverson, Peter</p> <p>2010-01-01</p> <p>An improved method and apparatus have been devised for measuring cyclic errors in the readouts of laser heterodyne <span class="hlt">interferometers</span> that are configured and operated as displacement gauges. The cyclic errors arise as a consequence of mixing of spurious optical and electrical signals in beam launchers that are subsystems of such <span class="hlt">interferometers</span>. The conventional approach to measurement of cyclic error involves phase measurements and yields values precise to within about 10 pm over air optical paths at laser wavelengths in the visible and near infrared. The present approach, which involves amplitude measurements instead of phase measurements, yields values precise to about .0.1 microns . about 100 times the precision of the conventional approach. In a displacement gauge of the type of interest here, the laser heterodyne <span class="hlt">interferometer</span> is used to measure any change in distance along an optical axis between two corner-cube retroreflectors. One of the corner-cube retroreflectors is mounted on a piezoelectric transducer (see figure), which is used to introduce a low-frequency periodic displacement that can be measured by the gauges. The transducer is excited at a frequency of 9 Hz by a triangular waveform to generate a 9-Hz triangular-wave displacement having an amplitude of 25 microns. The displacement gives rise to both amplitude and phase modulation of the heterodyne signals in the gauges. The modulation includes cyclic error components, and the magnitude of the cyclic-error component of the phase modulation is what one needs to measure in order to determine the magnitude of the cyclic displacement error. The precision attainable in the conventional (phase measurement) approach to measuring cyclic error is limited because the phase measurements are af-</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19790011421','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19790011421"><span id="translatedtitle"><span class="hlt">Radar</span>, Insect Population Ecology, and Pest Management</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Vaughn, C. R. (editor); Wolf, W. (editor); Klassen, W. (editor)</p> <p>1979-01-01</p> <p>Discussions included: (1) the potential role of <span class="hlt">radar</span> in insect ecology studies and pest management; (2) the potential role of <span class="hlt">radar</span> in correlating atmospheric phenomena with insect movement; (3) the present and future <span class="hlt">radar</span> systems; (4) program objectives required to adapt <span class="hlt">radar</span> to insect ecology studies and pest management; and (5) the specific action items to achieve the objectives.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec121-404.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 4 2012-10-01 2012-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping COAST GUARD... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph (b) of this section, all self... <span class="hlt">radar</span> system for surface navigation with a <span class="hlt">radar</span> screen mounted at the primary operating station....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title47-vol5/pdf/CFR-2012-title47-vol5-sec80-273.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title47-vol5/pdf/CFR-2012-title47-vol5-sec80-273.pdf"><span id="translatedtitle">47 CFR 80.273 - <span class="hlt">Radar</span> standards.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 47 Telecommunication 5 2012-10-01 2012-10-01 false <span class="hlt">Radar</span> standards. 80.273 Section 80.273... MARITIME SERVICES Equipment Authorization for Compulsory Ships § 80.273 <span class="hlt">Radar</span> standards. (a) <span class="hlt">Radar</span>... with <span class="hlt">radar</span> must comply with the following standards (all incorporated by reference, see § 80.7):...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec121-404.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 4 2010-10-01 2010-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping COAST GUARD... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph (b) of this section, all self... <span class="hlt">radar</span> system for surface navigation with a <span class="hlt">radar</span> screen mounted at the primary operating station....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title47-vol5/pdf/CFR-2014-title47-vol5-sec80-273.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title47-vol5/pdf/CFR-2014-title47-vol5-sec80-273.pdf"><span id="translatedtitle">47 CFR 80.273 - <span class="hlt">Radar</span> standards.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 47 Telecommunication 5 2014-10-01 2014-10-01 false <span class="hlt">Radar</span> standards. 80.273 Section 80.273... MARITIME SERVICES Equipment Authorization for Compulsory Ships § 80.273 <span class="hlt">Radar</span> standards. (a) <span class="hlt">Radar</span>... with <span class="hlt">radar</span> must comply with the following standards (all incorporated by reference, see § 80.7):...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://eosweb.larc.nasa.gov/project/fire/fire_ci2_etl_radar_table','SCIGOV-ASDC'); return false;" href="https://eosweb.larc.nasa.gov/project/fire/fire_ci2_etl_radar_table"><span id="translatedtitle">FIRE_CI2_ETL_<span class="hlt">RADAR</span></span></a></p> <p><a target="_blank" href="http://eosweb.larc.nasa.gov/">Atmospheric Science Data Center </a></p> <p></p> <p>2015-11-25</p> <p>FIRE_CI2_ETL_<span class="hlt">RADAR</span> Project Title:  FIRE II CIRRUS Discipline:  ... Platform:  Ground Station Instrument:  <span class="hlt">Radar</span> Spatial Coverage:  (37.06, -95.34) Spatial ... Search Guide Documents:  ETL_<span class="hlt">RADAR</span> Guide Readme Files:  Readme ETL_<span class="hlt">RADAR</span> (PS) ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec121-404.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 4 2013-10-01 2013-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping COAST GUARD... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph (b) of this section, all self... <span class="hlt">radar</span> system for surface navigation with a <span class="hlt">radar</span> screen mounted at the primary operating station....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.caps.ou.edu/~jdgao/publication/Bodine_RFC_paper.pdf','EPRINT'); return false;" href="http://www.caps.ou.edu/~jdgao/publication/Bodine_RFC_paper.pdf"><span id="translatedtitle">Understanding <span class="hlt">Radar</span> Refractivity: Sources of Uncertainty</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Gao, Jidong</p> <p></p> <p>Understanding <span class="hlt">Radar</span> Refractivity: Sources of Uncertainty David Bodine1,2 , Dan Michaud1,2 , Robert <span class="hlt">Radar</span> Research Center, University of Oklahoma, Norman, OK, USA 3 NOAA/OAR National Severe Storms validation of WSR-88D <span class="hlt">radar</span> refractiv- ity retrievals, and discusses some challenges to implementing <span class="hlt">radar</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec121-404.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 4 2014-10-01 2014-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping COAST GUARD... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph (b) of this section, all self... <span class="hlt">radar</span> system for surface navigation with a <span class="hlt">radar</span> screen mounted at the primary operating station....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title47-vol5/pdf/CFR-2013-title47-vol5-sec80-273.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title47-vol5/pdf/CFR-2013-title47-vol5-sec80-273.pdf"><span id="translatedtitle">47 CFR 80.273 - <span class="hlt">Radar</span> standards.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 47 Telecommunication 5 2013-10-01 2013-10-01 false <span class="hlt">Radar</span> standards. 80.273 Section 80.273... MARITIME SERVICES Equipment Authorization for Compulsory Ships § 80.273 <span class="hlt">Radar</span> standards. (a) <span class="hlt">Radar</span>... with <span class="hlt">radar</span> must comply with the following standards (all incorporated by reference, see § 80.7):...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec121-404.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 4 2011-10-01 2011-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping COAST GUARD... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph (b) of this section, all self... <span class="hlt">radar</span> system for surface navigation with a <span class="hlt">radar</span> screen mounted at the primary operating station....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20060037304&hterms=piezo+electric&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dpiezo%2Belectric','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20060037304&hterms=piezo+electric&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dpiezo%2Belectric"><span id="translatedtitle">Micro-Precision <span class="hlt">Interferometer</span>: Pointing Control System</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>O'Brien, John</p> <p>1995-01-01</p> <p>This paper describes the development of the wavefront tilt (pointing) control system for the JPL Micro-Precision <span class="hlt">Interferometer</span> (MPI). This control system employs piezo-electric actuators and a digital imaging sensor with feedback compensation to reject errors in instrument pointing. Stringent performance goals require large feedback, however, several characteristics of the plant tend to restrict the available bandwidth. A robust 7th-order wavefront tilt control system was successfully implemented on the MPI instrument, providing sufficient disturbance rejection performance to satisfy the established interference fringe visibility.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011IJMPD..20.2075A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011IJMPD..20.2075A"><span id="translatedtitle">The Virgo <span class="hlt">Interferometer</span> for Gravitational Wave Detection</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Accadia, T.; Acernese, F.; Antonucci, F.; Astone, P.; Ballardin, G.; Barone, F.; Barsuglia, M.; Bauer, Th. S.; Beker, M. G.; Belletoile, A.; Birindelli, S.; Bitossi, M.; Bizouard, M. A.; Blom, M.; Boccara, C.; Bondu, F.; Bonelli, L.; Bonnand, R.; Boschi, V.; Bosi, L.; Bouhou, B.; Braccini, S.; Bradaschia, C.; Brillet, A.; Brisson, V.; Budzy?ski, R.; Bulik, T.; Bulten, H. J.; Buskulic, D.; Buy, C.; Cagnoli, G.; Calloni, E.; Campagna, E.; Canuel, B.; Carbognani, F.; Cavalier, F.; Cavalieri, R.; Cella, G.; Cesarini, E.; Chassande-Mottin, E.; Chincarini, A.; Cleva, F.; Coccia, E.; Colacino, C. N.; Colas, J.; Colla, A.; Colombini, M.; Corsi, A.; Coulon, J.-P.; Cuoco, E.; D'Antonio, S.; Dattilo, V.; Davier, M.; Day, R.; Rosa, R. De; Debreczeni, G.; Del Prete, M.; di Fiore, L.; di Lieto, A.; di Paolo Emilio, M.; di Virgilio, A.; Dietz, A.; Dietz, A.; Drago, M.; Fafone, V.; Ferrante, I.; Fidecaro, F.; Fiori, I.; Flaminio, R.; Fournier, J.-D.; Franc, J.; Frasca, S.; Frasconi, F.; Freise, A.; Galimberti, M.; Gammaitoni, L.; Garufi, F.; Gáspár, M. E.; Gemme, G.; Genin, E.; Gennai, A.; Giazotto, A.; Gouaty, R.; Granata, M.; Greverie, C.; Guidi, G. M.; Hayau, J.-F.; Heitmann, H.; Hello, P.; Hild, S.; Huet, D.; Jaranowski, P.; Kowalska, I.; Królak, A.; Leroy, N.; Letendre, N.; Li, T. G. F.; Lorenzini, M.; Loriette, V.; Losurdo, G.; Majorana, E.; Maksimovic, I.; Man, N.; Mantovani, M.; Marchesoni, F.; Marion, F.; Marque, J.; Martelli, F.; Masserot, A.; Michel, C.; Milano, L.; Minenkov, Y.; Mohan, M.; Moreau, J.; Morgado, N.; Morgia, A.; Mosca, S.; Moscatelli, V.; Mours, B.; Neri, I.; Nocera, F.; Pagliaroli, G.; Palladino, L.; Palomba, C.; Paoletti, F.; Pardi, S.; Parisi, M.; Pasqualetti, A.; Passaquieti, R.; Passuello, D.; Persichetti, G.; Pichot, M.; Piergiovanni, F.; Pietka, M.; Pinard, L.; Poggiani, R.; Prato, M.; Prodi, G. A.; Punturo, M.; Puppo, P.; Rabeling, D. S.; Rácz, I.; Rapagnani, P.; Re, V.; Regimbau, T.; Ricci, F.; Robinet, F.; Rocchi, A.; Rolland, L.; Romano, R.; Rosi?ska, D.; Ruggi, P.; Sassolas, B.; Sentenac, D.; Sperandio, L.; Sturani, R.; Swinkels, B.; Toncelli, A.; Tonelli, M.; Torre, O.; Tournefier, E.; Travasso, F.; Vajente, G.; van den Brand, J. F. J.; van der Putten, S.; Vasuth, M.; Vavoulidis, M.; Vedovato, G.; Verkindt, D.; Vetrano, F.; Viceré, A.; Vinet, J.-Y.; Vocca, H.; Was, M.; Yvert, M.</p> <p></p> <p>The Virgo <span class="hlt">interferometer</span> for gravitational wave detection is described. During the commissioning phase that followed the first scientific data taking run an unprecedented sensitivity was obtained in the range 10-60 Hz. Since then an upgrade program has begun, with the aim of increasing the sensitivity, mainly through the introduction of fused silica wires to suspend mirrors and by increasing the Finesse of the Fabry-Perot cavities. Plans until the shutdown for the construction of the Advanced Virgo detector are given as well as the status of the upgrade.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_15 --> <div id="page_16" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="301"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SPIE.9634E..1WD','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SPIE.9634E..1WD"><span id="translatedtitle">In-fiber Michelson <span class="hlt">interferometer</span> inclinometer</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>da Silveira, C. R.; Jorge, P. A. S.; Costa, J. W. A.; Giraldi, M. T. M. R.; Santos, J. L.; Frazão, O.</p> <p>2015-09-01</p> <p>This work describes an in-fiber Michelson <span class="hlt">interferometer</span> inclinometer which is sensitive to curvature applied in the tapered region. The performance of this inclinometer is evaluated by calculating the variation of the fringe visibility near the 1550 nm spectral range as a function of the tilt angle. It is presented the results of four experimental measurements and calculated the average and standard deviation of those measurements. The results indicate a good response of the sensor within the angular range between 3° and 6°. The average of those four measurements is around -0.15/° and the greatest standard deviation is about 5.5%.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20100012802','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20100012802"><span id="translatedtitle">Modified Phasemeter for a Heterodyne Laser <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Loya, Frank M.</p> <p>2010-01-01</p> <p>Modifications have been made in the design of instruments of the type described in "Digital Averaging Phasemeter for Heterodyne Interferometry". A phasemeter of this type measures the difference between the phases of the unknown and reference heterodyne signals in a heterodyne laser <span class="hlt">interferometer</span>. The phasemeter design lacked immunity to drift of the heterodyne frequency, was bandwidth-limited by computer bus architectures then in use, and was resolution-limited by the nature of field-programmable gate arrays (FPGAs) then available. The modifications have overcome these limitations and have afforded additional improvements in accuracy, speed, and modularity. The modifications are summarized.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20040171663','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20040171663"><span id="translatedtitle">Controller of the Laser <span class="hlt">Interferometer</span> Space Antenna</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hyde, T. T.; Maghami, P. G.; Kim, J.</p> <p>2004-01-01</p> <p>The Laser <span class="hlt">Interferometer</span> Space Antenna mission is a planned gravitational wave detector consisting of three spacecraft in heliocentric orbit. Laser interferometry is used to measure distance fluctuations between test masses aboard each spacecraft to the picometer level over a 5 million kilometer separation. The Disturbance Reduction System comprises the pointing and positioning control of the spacecraft, electrostatic suspension control of the test masses, and point-ahead and acquisition control. This paper presents a control architecture and design for the Disturbance Reduction System to meet the stringent pointing and positioning requirements. Simulations are performed to demonstrate the feasibility of the proposed architecture.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013ESASP.722E.340K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013ESASP.722E.340K"><span id="translatedtitle">On The Potential Of Tandem-X To Asses Complex Topography</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kubanek, Julia; Westerhaus, Malte; Heck, Bernhard</p> <p>2013-12-01</p> <p>The <span class="hlt">single-pass</span> bistatic TanDEM-X (TerraSAR-X Add- on for Digital Elevation Measurements) mission consists of two nearly similar <span class="hlt">radar</span> satellites which build a large <span class="hlt">single-pass</span> Synthetic Aperture <span class="hlt">Radar</span> (SAR) <span class="hlt">interferometer</span>. As two images are recorded simultaneously, the coherence is comparably high which enables generating digital surface models (DSMs) of the area of investigation. As the presented study serves as a pilot-study for a project in which we aim to assess large topographic changes due to dome failures at stratovolcanoes, we chose here besides Merapi - as active, dome building volcano - its currently dormant neighbour Merbabu. We analysed six DSMs generated based on the bistatic TanDEM-X data for both test sites to evaluate the applicability of using <span class="hlt">single-pass</span> interferometric SAR(InSAR) for repeated DSM generation in high mountainous terrain.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19970023672','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19970023672"><span id="translatedtitle">The Clementine Bistatic <span class="hlt">Radar</span> Experiment</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Nozette, S.; Lichtenberg, C. L.; Spudis, P.; Bonner, R.; Ort, W.; Malaret, E.; Robinson, M.; Shoemaker, E. M.</p> <p>1996-01-01</p> <p>During the Clementine 1 mission, a bistatic <span class="hlt">radar</span> experiment measured the magnitude and polarization of the <span class="hlt">radar</span> echo versus bistatic angle, beta, for selected lunar areas. Observations of the lunar south pole yield a same-sense polarization enhancement around beta = 0. Analysis shows that the observed enhancement is localized to the permanently shadowed regions of the lunar south pole. <span class="hlt">Radar</span> observations of periodically solar-illuminated lunar surfaces, including the north pole, yielded no such enhancement. A probable explanation for these differences is the presence of low-loss volume scatterers, such as water ice, in the permanently shadowed region at the south pole.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/17818164','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/17818164"><span id="translatedtitle">Ganymede: observations by <span class="hlt">radar</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Goldstein, R M; Morris, G A</p> <p>1975-06-20</p> <p><span class="hlt">Radar</span> cross-section measurements indicate that Ganymede scatters to Earth 12 percent of the power expected from a conducting sphere of the same size and distance. This compares with 8 percent for Mars, 12 percent for Venus, 6 percent for Mercury, and about 8 percent for the asteroid Toro. Furthermore, Ganymede is considerably rougher (to the scale of the wavelength used, 12.6 centimeters) than Mars, Venus, or Mercury. Roughness is made evident in this experiment by the presence of echoes away from the center of the disk. A perfectly smooth target would reflect only a glint from the center, whereas a very rough target would reflect power from over the entire disk. PMID:17818164</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003SPIE.5204..583H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003SPIE.5204..583H"><span id="translatedtitle">Multistatic <span class="hlt">radar</span> resource management</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Horridge, Paul R.; Hernandez, Marcel L.</p> <p>2003-12-01</p> <p>In this paper, we implement a previously developed sensor management framework within the domain of multistatic <span class="hlt">radar</span> resource management. The methodology is based on controlling the Posterior Cram³er-Rao Lower Bound (PCRLB) which provides a bound on the performance of any unbiased target state estimator. In the second part of the paper, the additional complication of the Doppler Blind Zone, inside which the target cannot be detected, is considered. In the case of missed detections, the PCRLB has been shown to be overly optimistic, so we use a performance measure which more accurately accounts for missed detections. However, existing measures fail to accommodate constraints arising from the blind zone, so we modify the measure to incorporate this extra information. The modified measure is shown to give a more accurate estimate of tracking performance, facilitating efficient resource management.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004SPIE.5204..583H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004SPIE.5204..583H"><span id="translatedtitle">Multistatic <span class="hlt">radar</span> resource management</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Horridge, Paul R.; Hernandez, Marcel L.</p> <p>2004-01-01</p> <p>In this paper, we implement a previously developed sensor management framework within the domain of multistatic <span class="hlt">radar</span> resource management. The methodology is based on controlling the Posterior Cra?er-Rao Lower Bound (PCRLB) which provides a bound on the performance of any unbiased target state estimator. In the second part of the paper, the additional complication of the Doppler Blind Zone, inside which the target cannot be detected, is considered. In the case of missed detections, the PCRLB has been shown to be overly optimistic, so we use a performance measure which more accurately accounts for missed detections. However, existing measures fail to accommodate constraints arising from the blind zone, so we modify the measure to incorporate this extra information. The modified measure is shown to give a more accurate estimate of tracking performance, facilitating efficient resource management.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19910017300','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19910017300"><span id="translatedtitle">Historical aspects of <span class="hlt">radar</span> atmospheric dynamics</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Kato, Susumu</p> <p>1989-01-01</p> <p>A review of the history of <span class="hlt">radar</span> techniques which have been applied to atmospheric observation is given. The author starts with ionosphere observation with the ionosonde, symbolizing as it does the earliest history of <span class="hlt">radar</span> observation, and proceeds to later developments in <span class="hlt">radar</span> observation such as the use of partial reflection, meteor, and incoherent scatter <span class="hlt">radars</span>. Mesosphere stratosphere troposphere (MST) <span class="hlt">radars</span> are discussed in terms of lower atmosphere observation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/1174776','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/1174776"><span id="translatedtitle">Dual-domain lateral shearing <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Naulleau, Patrick P.; Goldberg, Kenneth Alan</p> <p>2004-03-16</p> <p>The phase-shifting point diffraction <span class="hlt">interferometer</span> (PS/PDI) was developed to address the problem of at-wavelength metrology of extreme ultraviolet (EUV) optical systems. Although extremely accurate, the fact that the PS/PDI is limited to use with coherent EUV sources, such as undulator radiation, is a drawback for its widespread use. An alternative to the PS/PDI, with relaxed coherence requirements, is lateral shearing interferometry (LSI). The use of a cross-grating, carrier-frequency configuration to characterize a large-field 4.times.-reduction EUV lithography optic is demonstrated. The results obtained are directly compared with PS/PDI measurements. A defocused implementation of the lateral shearing <span class="hlt">interferometer</span> in which an image-plane filter allows both phase-shifting and Fourier wavefront recovery. The two wavefront recovery methods can be combined in a dual-domain technique providing suppression of noise added by self-interference of high-frequency components in the test-optic wavefront.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0711.4194v1','EPRINT'); return false;" href="http://arxiv.org/pdf/0711.4194v1"><span id="translatedtitle">The Palomar Testbed <span class="hlt">Interferometer</span> Calibrator Catalog</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>G. T. van Belle; G. van Belle; M. J. Creech-Eakman; J. Coyne; A. F. Boden; R. L. Akeson; D. R. Ciardi; K. M. Rykoski; R. R. Thompson; B. F. Lane; for The PTI Collaboration</p> <p>2007-11-27</p> <p>The Palomar Testbed <span class="hlt">Interferometer</span> (PTI) archive of observations between 1998 and 2005 is examined for objects appropriate for calibration of optical long-baseline <span class="hlt">interferometer</span> observations - stars that are predictably point-like and single. Approximately 1,400 nights of data on 1,800 objects were examined for this investigation. We compare those observations to an intensively studied object that is a suitable calibrator, HD217014, and statistically compare each candidate calibrator to that object by computing both a Mahalanobis distance and a Principal Component Analysis. Our hypothesis is that the frequency distribution of visibility data associated with calibrator stars differs from non-calibrator stars such as binary stars. Spectroscopic binaries resolved by PTI, objects known to be unsuitable for calibrator use, are similarly tested to establish detection limits of this approach. From this investigation, we find more than 350 observed stars suitable for use as calibrators (with an additional $\\approx 140$ being rejected), corresponding to $\\gtrsim 95%$ sky coverage for PTI. This approach is noteworthy in that it rigorously establishes calibration sources through a traceable, empirical methodology, leveraging the predictions of spectral energy distribution modeling but also verifying it with the rich body of PTI's on-sky observations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20080000849&hterms=Mango&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3DMango','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20080000849&hterms=Mango&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3DMango"><span id="translatedtitle">Retrievals with the Infrared Atmospheric Sounding <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Zhou, Daniel K.; Liu, Xu; Larar, Allen M.; Smith, William L.; Taylor, Jonathan P.; Schlussel, Peter; Strow, L. Larrabee; Calbet, Xavier; Mango, Stephen A.</p> <p>2007-01-01</p> <p>The Infrared Atmospheric Sounding <span class="hlt">Interferometer</span> (IASI) on the MetOp satellite was launched on October 19, 2006. The Joint Airborne IASI Validation Experiment (JAIVEx) was conducted during April 2007 mainly for validation of the IASI on the MetOp satellite. IASI possesses an ultra-spectral resolution of 0.25/cm and a spectral coverage from 645 to 2760/cm. Ultraspectral resolution infrared spectral radiance obtained from near nadir observations provide atmospheric, surface, and cloud property information. An advanced retrieval algorithm with a fast radiative transfer model, including cloud effects, is used for atmospheric profile and cloud parameter retrieval. Preliminary retrievals of atmospheric soundings, surface properties, and cloud optical/microphysical properties with the IASI observations during the JAIVEx are obtained and presented. These retrievals are further inter-compared with those obtained from airborne FTS system, such as the NPOESS Airborne Sounder Testbed <span class="hlt">Interferometer</span> (NAST-I), dedicated dropsondes, radiosondes, and ground based Raman Lidar. The capabilities of satellite ultra-spectral sounder such as the IASI are investigated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19950008392','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19950008392"><span id="translatedtitle">Ultraviolet-Infrared Mapping <span class="hlt">Interferometic</span> Spectrometer</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1994-01-01</p> <p>Prism and grating spectrometers have been the defacto devices for spectral mapping and imaging (hereafter referred to as hyperspectra). We have developed a new, hybrid instrument with many superior capabilities, the Digital Array Scanned <span class="hlt">Interferometer</span>, DASI. The DASI performs the hyperspectral data acquisition in the same way as a grating or prism spectrograph, but retains the substantial advantages of the two-beam (Michelson) <span class="hlt">interferometer</span> with additional capabilities not possessed by either of the other devices. The DASI is capable of hyperspectral studies in virtually any space or surface environment at any wavelength from below 50 nm to beyond 12 microns with available array detectors. By our efforts, we have defined simple, low cost, no-moving parts DASI's capable of carrying out hyperspectral science measurements for solar system exploration missions, e.g. for martian, asteroid, lunar, or cometary surveys. DASI capabilities can be utilized to minimize cost, weight, power, pointing, and other physical requirements while maximizing the science data return for spectral mapping missions. Our success in the development of DASI's has become and continues to be an important influence on the efforts of the best research groups developing remote sensing instruments for space and other applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1995SPIE.2477...31S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1995SPIE.2477...31S"><span id="translatedtitle">15-m laser-stabilized imaging <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stebbins, Robin T.; Bender, Peter L.; Chen, Che Jen; Page, Norman A.; Meier, D.; Dupree, A. K.</p> <p>1995-06-01</p> <p>The LAser-Stabilized Imaging <span class="hlt">Interferometer</span> (LASII) concept is being developed as an astronomical telescope for the next generation of optical resolution beyond Hubble Space Telescope (HST). The essential ingredients are: a rigid and stable structure to minimize mechanical and thermal distortion, active control of the optical geometry by a laser metrology system, a self-deploying structure fitting into a single launch vehicle, and ultraviolet operation. We have modified earlier design concepts to fit the scale of an intermediate sized NASA mission. Our present design calls for 24 0.5 m apertures in a Mills Cross configuration, supported on four trusses. A fifth truss perpendicular to the primary surface would support the secondary mirror and the laser metrology control points. Either separate <span class="hlt">interferometers</span> or two guide telescopes would track guide stars. This instrument would have about 6 times the resolution of HST in the visible and the same collecting area. The resolution would reach 2.5 mas at 150 nm. The primary trusses would fold along the secondary truss for launch, and automatically deploy on orbit. Possible orbits are sun-synchronous at 900 km altitude, high earth orbit or solar orbit. Infrared capability could be included, if desired.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/542034','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/542034"><span id="translatedtitle">Advanced lightning location <span class="hlt">interferometer</span>. Final report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p></p> <p>1995-05-25</p> <p>In January, 1994, New Mexico Institute for Mining and Technology (NM Tech) was commissioned by Los Alamos National Laboratories (LANL) to develop a three-axis interferometric lightning mapping system to be used in determining the source of certain frequency-dispersed pulse pairs which had been detected by spaceborne sensors. The existing NM Tech VHF Lightning <span class="hlt">Interferometer</span> was a two axis system operating at 274 MHz with 6 MHz bandwidth. The third axis was to be added to refine estimates of the elevation angle to distant RF sources in that band. The system was to be initially deployed in support of an Air Force Technical Applications Center (AFTAC) effort planned for the Kennedy Space Center/Cape Canaveral AFS area in June-July of 1994. The project was, however, postponed until September of 1994. The <span class="hlt">interferometer</span> was set up and operated at KSC near the Lightning Detection and Ranging (LDAR) central station. The initial setup was in two-axis configuration, and the third (vertical) axis was added at about mid-project. Though the storms were reduced in frequency and severity over what one would expect in mid-summer, several good data sets were obtained and delivered to AFTAC.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1989nara.conf..141C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1989nara.conf..141C"><span id="translatedtitle">Reducing the interference between sidelobe cancellers and sidelobe blankers in electronic scanning array <span class="hlt">radars</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chin, J. E.; Liebman, P. M.; Fleming, J. E.</p> <p></p> <p>The <span class="hlt">interferometer</span> effects that result from combining SLB (sidelobe blanker) and SLC (sidelobe canceller) auxiliary antennas threaten the compatibility of the two functions within a single <span class="hlt">radar</span> system. An investigation of techniques to reduce or eliminate these effects is presented. Descriptions are presented of the simulation models (which consisted of planar arrays and cylindrical arrays), analytical approach, and results of the study. The results from early tests of two techniques-namely, aperture switching and jammer assignment or beam switching of steerable auxiliaries on a pulse-to-pulse basis during the duration of a pulse burst-unmistakably indicate that the interference effects can be reduced.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014SPIE.9074E..05M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014SPIE.9074E..05M"><span id="translatedtitle">Fly eye <span class="hlt">radar</span> or micro-<span class="hlt">radar</span> sensor technology</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Molchanov, Pavlo; Asmolova, Olga</p> <p>2014-05-01</p> <p>To compensate for its eye's inability to point its eye at a target, the fly's eye consists of multiple angularly spaced sensors giving the fly the wide-area visual coverage it needs to detect and avoid the threats around him. Based on a similar concept a revolutionary new micro-<span class="hlt">radar</span> sensor technology is proposed for detecting and tracking ground and/or airborne low profile low altitude targets in harsh urban environments. Distributed along a border or around a protected object (military facility and buildings, camp, stadium) small size, low power unattended <span class="hlt">radar</span> sensors can be used for target detection and tracking, threat warning, pre-shot sniper protection and provides effective support for homeland security. In addition it can provide 3D recognition and targets classification due to its use of five orders more pulses than any scanning <span class="hlt">radar</span> to each space point, by using few points of view, diversity signals and intelligent processing. The application of an array of directional antennas eliminates the need for a mechanical scanning antenna or phase processor. It radically decreases <span class="hlt">radar</span> size and increases bearing accuracy several folds. The proposed micro-<span class="hlt">radar</span> sensors can be easy connected to one or several operators by point-to-point invisible protected communication. The directional antennas have higher gain, can be multi-frequency and connected to a multi-functional network. Fly eye micro-<span class="hlt">radars</span> are inexpensive, can be expendable and will reduce cost of defense.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.psfc.mit.edu/ldx/pubs/DPP06_AB.pdf','EPRINT'); return false;" href="http://www.psfc.mit.edu/ldx/pubs/DPP06_AB.pdf"><span id="translatedtitle">Microwave <span class="hlt">Interferometer</span> Density Diagnostic for the Levitated Dipole Experiment</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Microwave <span class="hlt">Interferometer</span> Density Diagnostic for the Levitated Dipole Experiment A. Boxer, J. Kesner of the profile in response to RF heating and to gas-fueling have been observed #12;Basic Design · The basic design follows other microwave <span class="hlt">interferometers</span> in the literature, in particular C.W. Domier et. al. Rev</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20120000423','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20120000423"><span id="translatedtitle">Silicon Carbide Mounts for Fabry-Perot <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lindemann, Scott</p> <p>2011-01-01</p> <p>Etalon mounts for tunable Fabry- Perot <span class="hlt">interferometers</span> can now be fabricated from reaction-bonded silicon carbide structural components. These mounts are rigid, lightweight, and thermally stable. The fabrication of these mounts involves the exploitation of post-casting capabilities that (1) enable creation of monolithic structures having reduced (in comparison with prior such structures) degrees of material inhomogeneity and (2) reduce the need for fastening hardware and accommodations. Such silicon carbide mounts could be used to make lightweight Fabry-Perot <span class="hlt">interferometers</span> or could be modified for use as general lightweight optical mounts. Heretofore, tunable Fabry-Perot <span class="hlt">interferometer</span> structures, including mounting hardware, have been made from the low-thermal-expansion material Invar (a nickel/iron alloy) in order to obtain the thermal stability required for spectroscopic applications for which such <span class="hlt">interferometers</span> are typically designed. However, the high mass density of Invar structures is disadvantageous in applications in which there are requirements to minimize mass. Silicon carbide etalon mounts have been incorporated into a tunable Fabry-Perot <span class="hlt">interferometer</span> of a prior design that originally called for Invar structural components. The strength, thermal stability, and survivability of the <span class="hlt">interferometer</span> as thus modified are similar to those of the <span class="hlt">interferometer</span> as originally designed, but the mass of the modified <span class="hlt">interferometer</span> is significantly less than the mass of the original version.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.physics.irfu.se/Publications/Theses/Khotyaintsev:Lic:2005.pdf','EPRINT'); return false;" href="http://www.physics.irfu.se/Publications/Theses/Khotyaintsev:Lic:2005.pdf"><span id="translatedtitle">Theory of Solar <span class="hlt">Radar</span> Experiments</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>wave-kinetic theory, we obtain expressions for the frequency shift, the scattering cross-section experimental results . . . . . . . . . . . . . . . . . . . . . . 20 3.2.1 Effective cross-sectionsTheory of Solar <span class="hlt">Radar</span> Experiments: Combination Scattering by Anisotropic Langmuir Turbulence</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_16 --> <div id="page_17" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="321"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1171723','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1171723"><span id="translatedtitle">Ground Penetrating <span class="hlt">Radar</span>, Barrow, Alaska</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>John Peterson</p> <p>2015-03-06</p> <p>This is 500 MHz Ground Penetrating <span class="hlt">Radar</span> collected along the AB Line in Intensive Site 1 beginning in October 2012 and collected along L2 in Intensive Site 0 beginning in September 2011. Both continue to the present.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFMNS44A..05S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFMNS44A..05S"><span id="translatedtitle">Advanced Borehole <span class="hlt">Radar</span> for Hydrogeology</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sato, M.</p> <p>2014-12-01</p> <p>Ground Penetrating <span class="hlt">Radar</span> is a useful tool for monitoring the hydrogeological environment. We have developed GPR systems which can be applied to these purposes, and we will demonstrate examples borehole <span class="hlt">radar</span> measurements. In order to have longer <span class="hlt">radar</span> detection range, frequency lower than100MHz has been normally adopted in borehole <span class="hlt">radar</span>. Typical subsurface fractures of our interests have a few mm aperture and <span class="hlt">radar</span> resolution is much poorer than a few cm in this frequency range. We are proposing and demonstrating to use <span class="hlt">radar</span> polarimetry to solve this problem. We have demonstrated that a full-polarimetry borehole <span class="hlt">radar</span> can be used for characterization of subsurface fractures. Together with signal processing for antenna characteristic compensation to equalize the signal by a dipole antenna and slot antennas, we could demonstrate that polarimetric borehole <span class="hlt">radar</span> can estimate the surface roughness of subsurface fractures, We believe the surface roughness is closely related to water permeability through the fractures. We then developed a directional borehole <span class="hlt">radar</span>, which uses optical field sensor. A dipole antenna in a borehole has omni-directional radiation pattern, and we cannot get azimuthal information about the scatterers. We use multiple dipole antennas set around the borehole axis, and from the phase differences, we can estimate the 3-diemnational orientation of subsurface structures. We are using optical electric field sensor for receiver of borehole <span class="hlt">radar</span>. This is a passive sensor and connected only with optical fibers and does not require any electric power supply to operate the receiver. It has two major advantages; the first one is that the receiver can be electrically isolated from other parts, and wave coupling to a logging cable is avoided. Then, secondary, it can operate for a long time, because it does not require battery installed inside the system. It makes it possible to set sensors in fixed positions to monitor the change of environmental conditions for a long period. We demonstrated this idea using cross- hole borehole <span class="hlt">radar</span> measurement. We think this method is useful for detecting any changes in hydrogeological situations, which will be useful for subsurface storage such as LNG and nuclear waste.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20060047698&hterms=dines&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Ddines','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20060047698&hterms=dines&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Ddines"><span id="translatedtitle">Solar Confocal <span class="hlt">Interferometers</span> for Sub-Picometer-Resolution Spectral Filters</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gary, G. Allen; Pietraszewski, Chris; West, Edward A.; Dines, Terence C.</p> <p>2006-01-01</p> <p>The confocal Fabry-Perot <span class="hlt">interferometer</span> allows sub-picometer spectral resolution of Fraunhofer line profiles. Such high spectral resolution is needed to keep pace with the higher spatial resolution of the new set of large-aperture solar telescopes. The line-of-sight spatial resolution derived for line profile inversions would then track the improvements of the transverse spatial scale provided by the larger apertures. The confocal <span class="hlt">interferometer</span>'s unique properties allow a simultaneous increase in both etendue and spectral power. Methods: We have constructed and tested two confocal <span class="hlt">interferometers</span>. Conclusions: In this paper we compare the confocal <span class="hlt">interferometer</span> with other spectral imaging filters, provide initial design parameters, show construction details for two designs, and report on the laboratory test results for these <span class="hlt">interferometers</span>, and propose a multiple etalon system for future testing of these units and to obtain sub-picometer spectral resolution information on the photosphere in both the visible and near-infrared.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvA..92b3847M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvA..92b3847M"><span id="translatedtitle">SU(1,1)-type light-atom-correlated <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ma, Hongmei; Li, Dong; Yuan, Chun-Hua; Chen, L. Q.; Ou, Z. Y.; Zhang, Weiping</p> <p>2015-08-01</p> <p>The quantum correlation of light and atomic collective excitation can be used to compose an SU(1,1)-type hybrid light-atom <span class="hlt">interferometer</span>, where one arm in the optical SU(1,1) <span class="hlt">interferometer</span> is replaced by the atomic collective excitation. The phase-sensing probes include not only the photon field but also the atomic collective excitation inside the <span class="hlt">interferometer</span>. For a coherent squeezed state as the phase-sensing field, the phase sensitivity can approach the Heisenberg limit under the optimal conditions. We also study the effects of the loss of light field and the dephasing of atomic excitation on the phase sensitivity. This kind of active SU(1,1) <span class="hlt">interferometer</span> can also be realized in other systems, such as circuit quantum electrodynamics in microwave systems, which provides a different method for basic measurement using the hybrid <span class="hlt">interferometers</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AAS...22714601D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AAS...22714601D"><span id="translatedtitle">Developing an <span class="hlt">Interferometer</span> to Measure the Global 21cm Monopole</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Domagalski, Rachel; Patra, Nipanjana; Day, Cherie; Parsons, Aaron</p> <p>2016-01-01</p> <p>When radio <span class="hlt">interferometers</span> observe over very small fields of view, they cannot measure the monopole mode of the sky. However, when the field of view extends to a large region of the sky, it becomes possible to use an measure the monopole with an <span class="hlt">interferometer</span>. We are currently developing such an <span class="hlt">interferometer</span> at UC Berkeley's Radio Astronomy Lab (RAL) with the goal of measuring the early stages of the Epoch of Reionization by probing the sky for the global 21cm signal between 50 and 100 MHz, and we have deployed a preliminary version of this experiment in Colorado. We present the current status of the <span class="hlt">interferometer</span>, the future development plans, and some measurements taken in July of 2015. These measurements demonstrate performance of the analog signal chain of the <span class="hlt">interferometer</span> as well as the RFI environment of the deployment site in Colorado.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22303823','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22303823"><span id="translatedtitle">Dispersion <span class="hlt">interferometer</span> using modulation amplitudes on LHD (invited)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Akiyama, T. Yasuhara, R.; Kawahata, K.; Okajima, S.; Nakayama, K.</p> <p>2014-11-15</p> <p>Since a dispersion <span class="hlt">interferometer</span> is insensitive to mechanical vibrations, a vibration compensation system is not necessary. The CO{sub 2} laser dispersion <span class="hlt">interferometer</span> with phase modulations on the Large Helical Device utilizes the new phase extraction method which uses modulation amplitudes and can improve a disadvantage of the original dispersion <span class="hlt">interferometer</span>: measurement errors caused by variations of detected intensities. The phase variation within ±2 × 10{sup 17} m{sup ?3} is obtained without vibration compensation system. The measured line averaged electron density with the dispersion <span class="hlt">interferometer</span> shows good agreement with that with the existing far infrared laser <span class="hlt">interferometer</span>. Fringe jump errors in high density ranging up to 1.5 × 10{sup 20} m{sup ?3} can be overcome by a sufficient sampling rate of about 100 kHz.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AIPC.1335.1722C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AIPC.1335.1722C"><span id="translatedtitle">Microwave <span class="hlt">Interferometer</span> for Shock Wave Induced Displacement Measurement</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Choi, J.; Youssef, G.; Breugnot, S.; Gupta, V.; Itoh, T.</p> <p>2011-06-01</p> <p>A K-band microwave <span class="hlt">interferometer</span> for detecting shock wave induced displacement is demonstrated. Target displacement by laser induced shock wave has been widely used for material characterization and adhesive bond testing. In optical <span class="hlt">interferometers</span>, the surface displacement related to the interface stress is measured by counting the number of fringes which requires additional postprocessing steps. The longer wavelength of a microwave <span class="hlt">interferometer</span> allows direct reading of the surface displacement. Detection of the shock wave induced displacement on a plastic target is measured using a microwave <span class="hlt">interferometer</span> then the measured results are compared to the standard optical <span class="hlt">interferometer</span> results. The advantage of using a microwave-based system is discussed and possible application is demonstrated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20140010713','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20140010713"><span id="translatedtitle">The NASA Polarimetric <span class="hlt">Radar</span> (NPOL)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Petersen, Walter A.; Wolff, David B.</p> <p>2013-01-01</p> <p>Characteristics of the NASA NPOL S-band dual-polarimetric <span class="hlt">radar</span> are presented including its operating characteristics, field configuration, scanning capabilities and calibration approaches. Examples of precipitation science data collections conducted using various scan types, and associated products, are presented for different convective system types and previous field campaign deployments. Finally, the NASA NPOL <span class="hlt">radar</span> location is depicted in its home base configuration within the greater Wallops Flight Facility precipitation research array supporting NASA Global Precipitation Measurement Mission ground validation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20070018817','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20070018817"><span id="translatedtitle">Solar Confocal <span class="hlt">interferometers</span> for Sub-Picometer-Resolution Spectral Filters</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gary, G. Allen; Pietraszewski, Chris; West, Edward A.; Dines. Terence C.</p> <p>2007-01-01</p> <p>The confocal Fabry-Perot <span class="hlt">interferometer</span> allows sub-picometer spectral resolution of Fraunhofer line profiles. Such high spectral resolution is needed to keep pace with the higher spatial resolution of the new set of large-aperture solar telescopes. The line-of-sight spatial resolution derived for line profile inversions would then track the improvements of the transverse spatial scale provided by the larger apertures. In particular, profile inversion allows improved velocity and magnetic field gradients to be determined independent of multiple line analysis using different energy levels and ions. The confocal <span class="hlt">interferometer</span>'s unique properties allow a simultaneous increase in both etendue and spectral power. The higher throughput for the <span class="hlt">interferometer</span> provides significant decrease in the aperture, which is important in spaceflight considerations. We have constructed and tested two confocal <span class="hlt">interferometers</span>. A slow-response thermal-controlled <span class="hlt">interferometer</span> provides a stable system for laboratory investigation, while a piezoelectric <span class="hlt">interferometer</span> provides a rapid response for solar observations. In this paper we provide design parameters, show construction details, and report on the laboratory test for these <span class="hlt">interferometers</span>. The field of view versus aperture for confocal <span class="hlt">interferometers</span> is compared with other types of spectral imaging filters. We propose a multiple etalon system for observing with these units using existing planar <span class="hlt">interferometers</span> as pre-filters. The radiometry for these tests established that high spectral resolution profiles can be obtained with imaging confocal <span class="hlt">interferometers</span>. These sub-picometer spectral data of the photosphere in both the visible and near-infrared can provide important height variation information. However, at the diffraction-limited spatial resolution of the telescope, the spectral data is photon starved due to the decreased spectral passband.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1998PhDT........27T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998PhDT........27T"><span id="translatedtitle">Multiparameter <span class="hlt">radar</span> analysis using wavelets</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tawfik, Ben Bella Sayed</p> <p></p> <p>Multiparameter <span class="hlt">radars</span> have been used in the interpretation of many meteorological phenomena. Rainfall estimates can be obtained from multiparameter <span class="hlt">radar</span> measurements. Studying and analyzing spatial variability of different rainfall algorithms, namely R(ZH), the algorithm based on reflectivity, R(ZH, ZDR), the algorithm based on reflectivity and differential reflectivity, R(KDP), the algorithm based on specific differential phase, and R(KDP, Z DR), the algorithm based on specific differential phase and differential reflectivity, are important for <span class="hlt">radar</span> applications. The data used in this research were collected using CSU-CHILL, CP-2, and S-POL <span class="hlt">radars</span>. In this research multiple objectives are addressed using wavelet analysis namely, (1)space time variability of various rainfall algorithms, (2)separation of convective and stratiform storms based on reflectivity measurements, (3)and detection of features such as bright bands. The bright band is a multiscale edge detection problem. In this research, the technique of multiscale edge detection is applied on the <span class="hlt">radar</span> data collected using CP-2 <span class="hlt">radar</span> on August 23, 1991 to detect the melting layer. In the analysis of space/time variability of rainfall algorithms, wavelet variance introduces an idea about the statistics of the <span class="hlt">radar</span> field. In addition, multiresolution analysis of different rainfall estimates based on four algorithms, namely R(ZH), R( ZH, ZDR), R(K DP), and R(KDP, Z DR), are analyzed. The flood data of July 29, 1997 collected by CSU-CHILL <span class="hlt">radar</span> were used for this analysis. Another set of S-POL <span class="hlt">radar</span> data collected on May 2, 1997 at Wichita, Kansas were used as well. At each level of approximation, the detail and the approximation components are analyzed. Based on this analysis, the rainfall algorithms can be judged. From this analysis, an important result was obtained. The Z-R algorithms that are widely used do not show the full spatial variability of rainfall. In addition another intuitively obvious result was observed namely, R( KDP) has reduced the spatial variability due to smoothing of KDP estimates. The convective and stratiform separation was studied using multiresolution analysis. The June 22, 1995 data collected by CSU-CHILL <span class="hlt">radar</span> were used to evaluate the technique. Another set of data collected on August 23, 1991 representing stratiform conditions were also studied.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000SPIE.4006...31K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000SPIE.4006...31K"><span id="translatedtitle">VINCI: the VLT <span class="hlt">Interferometer</span> commissioning instrument</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kervella, Pierre; Coudé du Foresto, Vincent; Glindemann, Andreas; Hofmann, Reiner</p> <p>2000-07-01</p> <p>The Very Large Telescope <span class="hlt">Interferometer</span> (VLTI) is a complex system, made of a large number of separated elements. To prepare an early successful operation, it will require a period of extensive testing and verification to ensure that the many devices involved work properly together, and can produce meaningful data. This paper describes the concept chosen for the VLTI commissioning instrument, LEONARDO da VINCI, and details its functionalities. It is a fiber based two-way beam combiner, associated with an artificial star and an alignment verification unit. The technical commissioning of the VLTI is foreseen as a stepwise process: fringes will first be obtained with the commissioning instrument in an autonomous mode (no other parts of the VLTI involved); then the VLTI telescopes and optical trains will be tested in autocollimation; finally fringes will be observed on the sky.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19780010452','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19780010452"><span id="translatedtitle">Over-under double-pass <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Schindler, R. A. (inventor)</p> <p>1977-01-01</p> <p>An over-under double pass <span class="hlt">interferometer</span> in which the beamsplitter area and thickness can be reduced to conform only with optical flatness considerations was achieved by offsetting the optical center line of one cat's-eye retroreflector relative to the optical center line of the other in order that one split beam be folded into a plane distinct from the other folded split beam. The beamsplitter is made transparent in one area for a first folded beam to be passed to a mirror for doubling back and is made totally reflective in another area for the second folded beam to be reflected to a mirror for doubling back. The two beams thus doubled back are combined in the central, beamsplitting area of the beamsplitting and passed to a detector. This makes the beamsplitter insensitive to minimum thickness requirements and selection of material.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/0910.2943v1','EPRINT'); return false;" href="http://arxiv.org/pdf/0910.2943v1"><span id="translatedtitle">Coherent Thermoelectric Effects in Mesoscopic Andreev <span class="hlt">Interferometers</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Ph. Jacquod; R. S. Whitney</p> <p>2009-10-15</p> <p>We investigate thermoelectric transport through Andreev <span class="hlt">interferometers</span>. We show that the ratio of the thermal and the charge conductance exhibits large oscillations with the phase difference $\\phi$ between the two superconducting contacts, and that the Wiedemann-Franz law holds only when $\\phi=\\pi$. A large average thermopower furthermore emerges whenever there is an asymmetry in the dwell times to reach the superconducting contacts. When this is the case, the thermopower is odd in $\\phi$. In contrast, when the average times to reach either superconducting contact are the same, the average thermopower is zero, however mesoscopic effects (analogous to universal conductance fluctuations) lead to a sample-dependent thermopower which is systematically even in $\\phi$.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19870041421&hterms=gay&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dgay','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19870041421&hterms=gay&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dgay"><span id="translatedtitle">An 'X-banded' Tidbinbilla <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Batty, Michael J.; Gardyne, R. G.; Gay, G. J.; Jauncy, David L.; Gulkis, S.; Kirk, A.</p> <p>1986-01-01</p> <p>The recent upgrading of the Tidbinbilla two-element <span class="hlt">interferometer</span> to simultaneous S-band (2.3 GHz) and X-band (8.4 GHz) operation has provided a powerful new astronomical facility for weak radio source measurement in the Southern Hemisphere. The new X-band system has a minimum fringe spacing of 38 arcsec, and about the same positional measurement capability (approximately 2 arcsec) and sensitivity (1 s rms noise of 10 mJy) as the previous S-band system. However, the far lower confusion limit will allow detection and accurate positional measurements for sources as weak as a few millijanskys. This capability will be invaluable for observations of radio stars, X-ray sources and other weak, compact radio sources.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1985RScI...56..925S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1985RScI...56..925S"><span id="translatedtitle">TFTR Michelson <span class="hlt">interferometer</span> electron cyclotron emission diagnostic</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stauffer, F. J.; Boyd, D. A.; Cutler, R. C.; McCarthy, M. P.</p> <p>1985-05-01</p> <p>In July 1984, a Fourier transform spectrometer employing a fast-scanning Michelson <span class="hlt">interferometer</span> began operating on TFTR. This diagnostic system can measure the electron cyclotron emission spectrum 72 times per s with a time resolution of 11 ms and a spectral resolution of 3.6 GHz. The initial operating spectral range is 75-540 GHz, which is adequate for measuring the first three cyclotron harmonics at present TFTR magnetic field levels. The range can be extended easily to 75-1080 GHz in order to accommodate increases in toroidal magnetic field or to study superthermal ECE. The measured spectra are absolutely calibrated using a liquid nitrogen cooled blackbody reference source. The second harmonic feature of each spectrum is used to calculate the absolute electron temperature profile.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/19421271','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/19421271"><span id="translatedtitle">Exoplanet detection using a nulling <span class="hlt">interferometer</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cagigal, M; Canales, V</p> <p>2001-07-01</p> <p>The detection of extra solar planets is a topic of growing interest, which stretches current technology and knowledge to their limits. Indirect measurement confirms the existence of a considerable number. However, direct imaging is the only way to obtain information about the nature of these planets and to detect Earth-like planets, which could support life. The main problem for direct imaging is that planets are associated with a much brighter source of light. Here, we propose the use of the nulling <span class="hlt">interferometer</span> along with a photon counting technique called Dark Speckle. Using a simple model the behavior of the technique is predicted. The signal-to-noise ratio estimated confirms that it is a promising way to detect faint objects. PMID:19421271</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/20489966','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/20489966"><span id="translatedtitle">Optimization of a triple etalon <span class="hlt">interferometer</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Skinner, W R; Hays, P B; Abreu, V J</p> <p>1987-07-15</p> <p>The High Resolution Doppler Imager (HRDI) is a triple etalon Fabry-Perot <span class="hlt">interferometer</span> designed to measure Doppler shifts of rotational lines in the O(2) atmospheric system from the Upper Atmosphere Research Satellite. These shifts are used to determine wind vectors in the stratosphere and mesosphere. This paper presents the techniques used to determine the gap thicknesses and reflectivities of the three etalons of the HRDI instrument. The spacings are found to be 1.000, 0.186, and 0.025 cm. These spacings are independent of the reflectivity of the etalons. The reflectivities of the three etalons should be nearly equal to minimize the errors in the wind measurement caused by mistuning of the etalons. The choice of the reflectivity does not strongly influence the statistical error in the wind error when the values are less than ~0.90. PMID:20489966</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012SPIE.8445E..0DH','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012SPIE.8445E..0DH"><span id="translatedtitle">The Very Large Telescope <span class="hlt">Interferometer</span> v2012+</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haguenauer, Pierre; Abuter, Roberto; Andolfato, Luigi; Alonso, Jaime; Blanchard, Guillaume; Berger, Jean-Philippe; Bourget, Pierre; Brillant, Stephane; Derie, Frédéric; Delplancke, Françoise; Di Lieto, Nicola; Dupuy, Christophe; Gilli, Bruno; Gitton, Philippe; Gonzalez, Juan Carlos; Guisard, Stéphane; Guniat, Serge; Hudepohl, Gerhard; Kaufer, Andreas; Lévêque, Samuel; Ménardi, Serge; Mérand, Antoine; Morel, Sebastien; Percheron, Isabelle; Phan Duc, Than; Poupar, Sebastien; Ramirez, Andres; Reineiro, Claudio; Rengaswamy, Sridharan; Rivinius, Thomas; Schöller, Markus; Schmid, Christian; Segovia, Alex; Schuhler, Nicolas; Valdes, Guillermo; de Wit, Willem Jan; Wittkowski, Markus</p> <p>2012-07-01</p> <p>The ESO Very Large Telescope <span class="hlt">Interferometer</span> (VLTI) offers access to the four 8-m Unit Telescopes (UT) and the four 1.8-m Auxiliary Telescopes (AT) of the Paranal Observatory located in the Atacama Desert in northern Chile. The two VLTI instruments, MIDI and AMBER deliver regular scientific results. In parallel to the operation, the instruments developments are pursued, and new modes are studied and commissioned to offer a wider range of scientific possibilities to the community and increase sensitivity. New configurations of the ATs have been offered and are frequently discussed with the science users of the VLTI and implemented to optimize the scientific return. The PRIMA instrument, bringing astrometry capability to the VLTI and phase referencing to the instruments is being commissioned. The visitor instrument PIONIER is now fully operational and bringing imaging capability to the VLTI. The current status of the VLTI is described with successes and scientific results, and prospects on future evolution are presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008SPIE.7013E..0CH','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008SPIE.7013E..0CH"><span id="translatedtitle">The Very Large Telescope <span class="hlt">Interferometer</span>: an update</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haguenauer, Pierre; Abuter, Roberto; Alonso, Jaime; Argomedo, Javier; Bauvir, Bertrand; Blanchard, Guillaume; Bonnet, Henri; Brillant, Stéphane; Cantzler, Michael; Derie, Frédéric; Delplancke, Françoise; Di Lieto, Nicola; Dupuy, Christophe; Durand, Yves; Gitton, Philippe; Gilli, Bruno; Glindemann, Andreas; Guniat, Serge; Guisard, Stéphane; Haddad, Nicolas; Hudepohl, Gerhard; Hummel, Christian; Jesuran, Nathaniel; Kaufer, Andreas; Koehler, Bertrand; Le Bouquin, Jean-Baptiste; Lévêque, Samuel; Lidman, Christopher; Mardones, Pedro; Ménardi, Serge; Morel, Sébastien; Percheron, Isabelle; Petr-Gotzens, Monika; Phan Duc, Than; Puech, Florence; Ramirez, Andres; Rantakyrö, Fredrik; Richichi, Andrea; Rivinius, Thomas; Sahlmann, Johannes; Sandrock, Stefan; Schöller, Markus; Schuhler, Nicolas; Somboli, Fabio; Stefl, Stanislav; Tapia, Mario; Van Belle, Gerard; Wallander, Anders; Wehner, Stefan; Wittkowski, Markus</p> <p>2008-07-01</p> <p>The ESO Very Large Telescope <span class="hlt">Interferometer</span> (VLTI) offers access to the four 8 m Unit Telescopes (UT) and the four 1.8 m Auxiliary Telescopes (AT) of the Paranal Observatory located in the Atacama Desert in northern Chile. The fourth AT has been delivered to operation in December 2006, increasing the flexibility and simultaneous baselines access of the VLTI. Regular science operations are now carried on with the two VLTI instruments, AMBER and MIDI. The FINITO fringe tracker is now used for both visitor and service observations with ATs and will be offered on UTs in October 2008, bringing thus the fringe tracking facility to VLTI instruments. In parallel to science observations, technical periods are also dedicated to the characterization of the VLTI environment, upgrades of the existing systems, and development of new facilities. We will describe the current status of the VLTI and prospects on future evolution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010SPIE.7734E..04H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010SPIE.7734E..04H"><span id="translatedtitle">The very large telescope <span class="hlt">Interferometer</span>: 2010 edition</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Haguenauer, Pierre; Alonso, Jaime; Bourget, Pierre; Brillant, Stephane; Gitton, Philippe; Guisard, Stephane; Poupar, Sébastien; Schuhler, Nicolas; Abuter, Roberto; Andolfato, Luigi; Blanchard, Guillaume; Berger, Jean-Philippe; Cortes, Angela; Dérie, Frédéric; Delplancke, Françoise; Di Lieto, Nicola; Dupuy, Christophe; Gilli, Bruno; Glindemann, Andreas; Guniat, Serge; Huedepohl, Gerhard; Kaufer, Andreas; Le Bouquin, Jean-Baptiste; Lév"que, Samuel; Ménardi, Serge; Mérand, Antoine; Morel, Sebastien; Percheron, Isabelle; Phan Duc, Than; Pino, Andres; Ramirez, Andres; Rengaswamy, Sridharan; Richichi, Andrea; Rivinius, Thomas; Sahlmann, Johannes; Schoeller, Markus; Schmid, Christian; Stefl, Stan; Valdes, Guillermo; van Belle, Gerard; Wehner, Stefan; Wittkowski, Markus</p> <p>2010-07-01</p> <p>The ESO Very Large Telescope <span class="hlt">Interferometer</span> (VLTI) offers access to the four 8-m Unit Telescopes (UT) and the four 1.8-m Auxiliary Telescopes (AT) of the Paranal Observatory located in the Atacama Desert in northern Chile. The two VLTI instruments, MIDI and AMBER deliver regular scientific results. In parallel to the operation, the instruments developments are pursued, and new modes are studied and commissioned to offer a wider range of scientific possibilities to the community. New configurations of the ATs array are discussed with the science users of the VLTI and implemented to optimize the scientific return. The monitoring and improvement of the different systems of the VLTI is a continuous work. The PRIMA instrument, bringing astrometry capability to the VLTI and phase referencing to the instruments has been successfully installed and the commissioning is ongoing. The possibility for visiting instruments has been opened to the VLTI facility.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_17 --> <div id="page_18" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="341"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=PIA01785&hterms=Barrier+islands&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3D%2528Barrier%2Bislands%2529','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=PIA01785&hterms=Barrier+islands&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D70%26Ntt%3D%2528Barrier%2Bislands%2529"><span id="translatedtitle">Space <span class="hlt">Radar</span> Image of Long Island Optical/<span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1994-01-01</p> <p>This pair of images of the Long Island, New York region is a comparison of an optical photograph (top) and a <span class="hlt">radar</span> image (bottom), both taken in darkness in April 1994. The photograph at the top was taken by the Endeavour astronauts at about 3 a.m. Eastern time on April 20, 1994. The image at the bottom was acquired at about the same time four days earlier on April 16,1994 by the Spaceborne Imaging <span class="hlt">Radar</span>-C/X-Band Synthetic Aperture <span class="hlt">Radar</span> (SIR-C/X-SAR) system aboard the space shuttle Endeavour. Both images show an area approximately 100 kilometers by 40 kilometers (62 miles by 25 miles) that is centered at 40.7 degrees North latitude and 73.5 degrees West longitude. North is toward the upper right. The optical image is dominated by city lights, which are particularly bright in the densely developed urban areas of New York City located on the left half of the photo. The brightest white zones appear on the island of Manhattan in the left center, and Central Park can be seen as a darker area in the middle of Manhattan. To the northeast (right) of the city, suburban Long Island appears as a less densely illuminated area, with the brightest zones occurring along major transportation and development corridors. Since <span class="hlt">radar</span> is an active sensing system that provides its own illumination, the <span class="hlt">radar</span> image shows a great amount of surface detail, despite the night-time acquisition. The colors in the <span class="hlt">radar</span> image were obtained using the following <span class="hlt">radar</span> channels: red represents the L-band (horizontally transmitted and received); green represents the L-band (horizontally transmitted and vertically received); blue represents the C-band (horizontally transmitted and vertically received). In this image, the water surface - the Atlantic Ocean along the bottom edge and Long Island Sound shown at the top edge - appears red because small waves at the surface strongly reflect the horizontally transmitted and received L-band <span class="hlt">radar</span> signal. Networks of highways and railroad lines are clearly visible in the <span class="hlt">radar</span> image; many of them can also be seen as bright lines i the optical image. The runways of John F. Kennedy International Airport appear as a dark rectangle in Jamaica Bay on the left side of the image. Developed areas appear generally as bright green and orange, while agricultural, protected and undeveloped areas appear darker blue or purple. This contrast can be seen on the barrier islands along the south coast of Long Island, which are heavily developed in the Rockaway and Long Beach areas south and east of Jamaica Bay, but further to the east, the islands are protected and undeveloped.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/6706797','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/6706797"><span id="translatedtitle">VISAR (Velocity <span class="hlt">Interferometer</span> System for Any Reflector): Line-imaging <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hemsing, W.F.; Mathews, A.R.; Warnes, R.H.; Whittemore, G.R.</p> <p>1990-01-01</p> <p>This paper describes a Velocity <span class="hlt">Interferometer</span> System for Any Reflector (VISAR) technique that extends velocity measurements from single points to a line. Single-frequency argon laser light was focused through a cylindrical lens to illuminate a line on a surface. The initially stationary, flat surface was accelerated unevenly during the experiment. Motion produced a Doppler-shift of light reflected from the surface that was proportional to the velocity at each point. The Doppler-shifted image of the illuminated line was focused from the surface through a push-pull VISAR <span class="hlt">interferometer</span> where the light was split into four quadrature-coded images. When the surface accelerated, the Doppler-shift caused the interference for each point on each line image to oscillate sinusoidally. Coherent fiber optic bundles transmitted images from the <span class="hlt">interferometer</span> to an electronic streak camera for sweeping in time and recording on film. Data reduction combined the images to yield a continuous velocity and displacement history for all points on the surface that reflected sufficient light. The technique was demonstrated in an experiment where most of the surface was rapidly driven to a saddle shape by an exploding foil. Computer graphics were used to display the measured velocity history and to aid visualization of the surface motion. 6 refs., 8 figs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007SPIE.6744E..1JB','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007SPIE.6744E..1JB"><span id="translatedtitle">The aerospace imaging <span class="hlt">interferometer</span> ALISEO: further improvements of calibration methods and assessment of <span class="hlt">interferometer</span> response</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Barducci, A.; Castagnoli, F.; Guzzi, D.; Marcoionni, P.; Pippi, I.</p> <p>2007-10-01</p> <p>ALISEO (Aerospace Leap-frog Imaging Stationary <span class="hlt">Interferometer</span> for Earth Observation) belongs to the stationary <span class="hlt">interferometers</span> representing a promising architecture for future Earth Observation (EO) sensors due to their simple optical layout. ALISEO has been selected by the Italian Space Agency as the principal payload for a new optical mission based on a micro-satellite (MIOsat). Payloads planned for MIOsat are an extensible telescope, a high-resolution panchromatic camera, a Mach-Zehnder MEMS <span class="hlt">interferometer</span>, and ALISEO. MIOsat is expected to provide a platform with pointing capability for those advanced sensors. ALISEO operates in the common-path Sagnac configuration, and it does not employ any moving part to generate phase delay between the two rays. The sensor acquires the target images modulated by a pattern of autocorrelation functions: a fringe pattern that is fixed with respect to the instrument's field of view. The complete interferogram of each target location is retrieved introducing relative source-observer motion, which allows any image pixels to be observed under different phase delays. Recent laboratory measurements performed with ALISEO are described and discussed in this paper. In order to calibrate the optical path difference (OPD) of raw interferograms, a set of measurements have been carried out using a double planar diffuser system and several coloured He-Ne lasers. Standard reflectance tiles together doped with Holmium and Rare Earths have been used for validating the wavelength calibration of the instrument and proving the reliability of the reflectance retrieving procedure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002atpp.conf..605G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002atpp.conf..605G"><span id="translatedtitle">Gravitational Waves <span class="hlt">Interferometers</span> and the Virgo Project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gaddi, A.</p> <p>2002-11-01</p> <p>Radio, optical and X-rays telescopes are improving our knowledge of deep space. All these telescopes detect electromagnetic radiation at various frequencies. But a different kind of radiation is generated in the deeper space; it is the gravitational one. Gravitational waves change the space-time metric. As a consequence, GW telescopes should detect an extremely small strain (h < 10-21) of the geometry of a reference frame; if the frame has a reference dimension (L) of some kilometers, the deformation amplitude (?L = h × L) is limited to 10-16 meters. Laser <span class="hlt">interferometers</span> are the most suitable devices to make precise measurements of distances. Their resolution is limited by the laser wavelength (? = 10-6 meters) and by the light wave-shift detection capability (? ?= 1 ppb). These theoretical limits are strongly degraded by different noise sources, which reduce the actual resolution by several orders of magnitude. Applied physicists and engineers are working together to overcome the technical problems that still keep the distance between theoretical and actual detectors' performances. Three large GW telescopes, based on the laser interferometric technology, are under commissioning in the USA (2) and Europe (1). They will become operatives in the next years, with sensitivity of the order of h = 10-21, in the range between 10 Hz and a few kHz. Among the others, two characteristics are peculiar of the VIRGO <span class="hlt">interferometer</span>: the high performance of the mirrors' seismic isolation system and the huge ultra high vacuum volume, that will result in the biggest UHV apparatus ever built all over Europe.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20040016378&hterms=black+triangle&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dblack%2Btriangle','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20040016378&hterms=black+triangle&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dblack%2Btriangle"><span id="translatedtitle">Control of the Laser <span class="hlt">Interferometer</span> Space Antenna</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Maghami, Peiman; Hyde, T. Tupper</p> <p>2003-01-01</p> <p>The detection of gravity waves will open a new window of observation on the universe. Unlike typical observatories, which detect electromagnetic waves traveling through space-time, the Laser <span class="hlt">Interferometer</span> Space Antenna (LISA) will detect ripples in space-time itself. Science targets include galactic binaries, merging supermassive black holes, intermediate-mass/seed black holes, and cosmological backgrounds. Gravity waves are detected by measuring the strain in space, i.e. the change in distance between a set of masses (test masses or proof masses) separated by a great distance. Ground based detection of gravity waves by Laser <span class="hlt">Interferometer</span> Gravitational Wave Observatory (LIGO) and other observatories are possible with laser interferometry; hut the relatively short arm length (4 km) and seismic noise limit the measurement band to above 10 Hz on Earth. LISA also uses laser interferometric measurement of the change in distance between test masses, but does it in space. Each LISA spacecraft embodies two test masses. Space allows very long arm lengths (5 million km for LISA) and a very quiet acceleration environment (3.5x10(exp -15) meters per second squared/Hertz (sup 0.5) for LISA), which allows for the detection of gravity wave strains to a best sensitivity of 3x10(exp -24) strain/Hertz (sup 0.5) over the measurement band of 10(exp -4) to 10(exp -1) Hertz for a one-year observation. The LISA mission consists of three spacecraft in heliocentric orbit. The orbits are chosen so that the three spacecraft form a roughly equilateral triangle with its center located at a radius of 1 AU and 20 degrees behind the Earth, as shown. Requirements are placed on the rotational and translational dynamics of each spacecraft to ensure that the proper sensitivity for science measurements can be achieved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20130009019','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20130009019"><span id="translatedtitle"><span class="hlt">Interferometers</span> Sharpen Measurements for Better Telescopes</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>2013-01-01</p> <p>Over the last decade, there have been a number of innovations that have made possible the largest and most powerful telescope of its time: the James Webb Space Telescope (JWST). Scheduled to launch in 2018, JWST will provide insight into what the oldest, most distant galaxies look like. When engineers build a first-of-its-kind instrument like the JWST, they often must make new tools to construct the new technology. Throughout the decades of planning, development, and construction of the JWST, NASA has worked with numerous partners to spur innovations that have enabled the telescope s creation. Though the JWST s launch date is still several years away, a number of these innovations are spinning off to provide benefits here on Earth. One of these spinoffs has emerged from the extensive testing the JWST must undergo to ensure it will function in the extreme environment of space. In order to test the JWST instruments in conditions that closely resemble those in space, NASA uses a cryogenic vacuum chamber. By dropping the temperatures down to -400 F and employing powerful pumps to remove air from the chamber, engineers can test whether the JWST instruments will function once the spacecraft leaves Earth. Traditionally, a phase-shifting <span class="hlt">interferometer</span> is used to measure optics like the JWST s mirrors to verify their precise shape, down to tens of nanometers, during manufacturing. However, the large size of the mirrors, coupled with vibration induced by the cryo-pumps, prohibits the use of traditional phase-shifting <span class="hlt">interferometers</span> to measure the mirrors within the chamber environment. Because the JWST will be located in deep space, far from any possible manned service mission, it was essential to find a robust solution to guarantee the performance of the mirrors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19870014009','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19870014009"><span id="translatedtitle">High resolution <span class="hlt">radar</span> map of the Moon</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Thompson, T. W.</p> <p>1987-01-01</p> <p>Previous <span class="hlt">radar</span> mappings of the Moon at 70 cm wavelength in the late 1960's by Thompson have been replaced with a new set of observations using the 430 MHz <span class="hlt">radar</span> at the Arecibo Observatory, Puerto Rico. <span class="hlt">Radar</span> resolution was reduced to 2 to 5 km <span class="hlt">radar</span> cell size and a beam-sweep, limb-to-limb calibration was conducted. Advances in computer technology provided the principle means of improving lunar <span class="hlt">radar</span> mapping at this wavelength. Observation techniques and data processing are described and scattering differences found in the orthographic projection of the <span class="hlt">radar</span> data are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://weather.ou.edu/~guzhang/page/2003Vivek_RS8050.pdf','EPRINT'); return false;" href="http://weather.ou.edu/~guzhang/page/2003Vivek_RS8050.pdf"><span id="translatedtitle"><span class="hlt">Radar</span> reflectivity calibration using differential propagation phase measurement</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Zhang, Guifu</p> <p></p> <p><span class="hlt">Radar</span> reflectivity calibration using differential propagation phase measurement J. Vivekanandan,1 June 2002; accepted 12 June 2002; published 12 March 2003. [1] A method for calibrating <span class="hlt">radar</span> reflectivity using polarization <span class="hlt">radar</span> measurements in rain is described. Accurate calibration of <span class="hlt">radar</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007MAP....96..229B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007MAP....96..229B"><span id="translatedtitle">Forecasting weather <span class="hlt">radar</span> propagation conditions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bech, J.; Codina, B.; Lorente, J.</p> <p>2007-06-01</p> <p>The increasing use of weather <span class="hlt">radar</span> quantitative precipitation estimates, particularly in automatic applications such as operational hydrometeorological modelling or assimilation in numerical weather prediction (NWP) models, has promoted the development of quality control procedures on <span class="hlt">radar</span> data. Anomalous propagation (AP) of the <span class="hlt">radar</span> beam due to deviation from the standard refractivity vertical profile, is one of the factors that may affect seriously the quality of <span class="hlt">radar</span> observations because of the increase in quantity and intensity of non-precipitating clutter echoes and consequent contamination of the estimated rainfall field. Another undesired effect of AP is the change in the expected <span class="hlt">radar</span> echo height, which may be relevant when correcting for beam blockage in <span class="hlt">radar</span> rainfall estimation in complex terrain. The aim of this paper is to study the use of NWP mesoscale forecasts to predict and monitor AP events. A nested 15-km grid resolution version of the MASS model has been used to retrieve refractivity profiles in the coastal area of Barcelona, near a weather <span class="hlt">radar</span> and a radiosonde station. Using the refractivity profiles two different magnitudes were computed: the vertical refractivity profile of the lowest 1000 m layer and a ducting index which describes the existence and intensity of the most super-refractive layer contained in the lowest 3-km layer. A comparison between model forecasts and radiosonde diagnostics during a six-month period showed that the model tended to underestimate the degree of super-refraction, with a bias of 4 km-1 and RMSE of 11 km-1 in the 1-km vertical refractivity gradient. Further analysis of the data showed that a combination of previous observations and forecasts allowed to produce modified forecasts improving the original direct model output, decreasing substantially the bias, reducing the RMSE by 20% and improving the skill by 40%, beating also radiosonde observations persistence.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014SPIE.9248E..0IM','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014SPIE.9248E..0IM"><span id="translatedtitle">All-digital <span class="hlt">radar</span> architecture</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Molchanov, Pavlo A.</p> <p>2014-10-01</p> <p>All digital <span class="hlt">radar</span> architecture requires exclude mechanical scan system. The phase antenna array is necessarily large because the array elements must be co-located with very precise dimensions and will need high accuracy phase processing system for aggregate and distribute T/R modules data to/from antenna elements. Even phase array cannot provide wide field of view. New nature inspired all digital <span class="hlt">radar</span> architecture proposed. The fly's eye consists of multiple angularly spaced sensors giving the fly simultaneously thee wide-area visual coverage it needs to detect and avoid the threats around him. Fly eye <span class="hlt">radar</span> antenna array consist multiple directional antennas loose distributed along perimeter of ground vehicle or aircraft and coupled with receiving/transmitting front end modules connected by digital interface to central processor. Non-steering antenna array allows creating all-digital <span class="hlt">radar</span> with extreme flexible architecture. Fly eye <span class="hlt">radar</span> architecture provides wide possibility of digital modulation and different waveform generation. Simultaneous correlation and integration of thousands signals per second from each point of surveillance area allows not only detecting of low level signals ((low profile targets), but help to recognize and classify signals (targets) by using diversity signals, polarization modulation and intelligent processing. Proposed all digital <span class="hlt">radar</span> architecture with distributed directional antenna array can provide a 3D space vector to the jammer by verification direction of arrival for signals sources and as result jam/spoof protection not only for <span class="hlt">radar</span> systems, but for communication systems and any navigation constellation system, for both encrypted or unencrypted signals, for not limited number or close positioned jammers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AAS...22134202K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AAS...22134202K"><span id="translatedtitle">Michelson-type Radio <span class="hlt">Interferometer</span> for University Education</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Koda, Jin; Barrett, J. W.; Hasegawa, T.; Hayashi, M.; Shafto, G.; Slechta, J.</p> <p>2013-01-01</p> <p>Despite the increasing importance of interferometry in astronomy, the lack of educational <span class="hlt">interferometers</span> is an obstacle to training the futue generation of astronomers. Students need hands-on experiments to fully understand the basic concepts of interferometry. Professional <span class="hlt">interferometers</span> are often too complicated for education, and it is difficult to guarantee access for classes in a university course. We have built a simple and affordable radio <span class="hlt">interferometer</span> for education and used it for an undergraduate and graduate laboratory project. This <span class="hlt">interferometer</span>'s design is based on the Michelson & Peace's stellar optical <span class="hlt">interferometer</span>, but operates at a radio wavelength using a commercial broadcast satellite dish and receiver. Two side mirrors are surfaced with kitchen aluminum foil and slide on a ladder, providing baseline coverage. This <span class="hlt">interferometer</span> can resolve and measure the diameter of the Sun, a nice daytime experiment which can be carried out even under a marginal weather (i.e., partial cloud coverage). Commercial broadcast satellites provide convenient point sources. By comparing the Sun and satellites, students can learn how an <span class="hlt">interferometer</span> works and resolves structures in the sky.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/21612456','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/21612456"><span id="translatedtitle">EIT Based Gas Detector Design by Using Michelson <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Abbasian, K.; Rostami, A.; Abdollahi, M. H.</p> <p>2011-12-26</p> <p>Electromagnetically induced transparency (EIT) is one of the interesting phenomena of light-matter interaction which modifies matter properties for propagation of light. In other words, we can change the absorption and refractive index (RI) in neighborhood of the resonant frequency using EIT. In this paper, we have doped 3-level quantum dots in one of the Michelson <span class="hlt">Interferometer</span>'s mirror and used EIT to change its RI. So, a controllable phase difference between lights in two arms of <span class="hlt">interferometer</span> is created. Long response time is the main drawback of Michelson <span class="hlt">interferometer</span> based sensor, which is resolved by this technique.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvL.115h3002E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvL.115h3002E"><span id="translatedtitle">High-Resolution Atom <span class="hlt">Interferometers</span> with Suppressed Diffraction Phases</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Estey, Brian; Yu, Chenghui; Müller, Holger; Kuan, Pei-Chen; Lan, Shau-Yu</p> <p>2015-08-01</p> <p>We experimentally and theoretically study the diffraction phase of large-momentum transfer beam splitters in atom <span class="hlt">interferometers</span> based on Bragg diffraction. We null the diffraction phase and increase the sensitivity of the <span class="hlt">interferometer</span> by combining Bragg diffraction with Bloch oscillations. We demonstrate agreement between experiment and theory, and a 1500-fold reduction of the diffraction phase, limited by measurement noise. In addition to reduced systematic effects, our <span class="hlt">interferometer</span> has high contrast with up to 4.4 ×106 radians of phase difference, and a resolution in the fine structure constant of ? ? /? =0.25 ppb in 25 h of integration time.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20080004623','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20080004623"><span id="translatedtitle">Method of calibrating an <span class="hlt">interferometer</span> and reducing its systematic noise</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hammer, Philip D. (Inventor)</p> <p>1997-01-01</p> <p>Methods of operation and data analysis for an <span class="hlt">interferometer</span> so as to eliminate the errors contributed by non-responsive or unstable pixels, interpixel gain variations that drift over time, and spurious noise that would otherwise degrade the operation of the <span class="hlt">interferometer</span> are disclosed. The methods provide for either online or post-processing calibration. The methods apply prescribed reversible transformations that exploit the physical properties of interferograms obtained from said <span class="hlt">interferometer</span> to derive a calibration reference signal for subsequent treatment of said interferograms for interpixel gain variations. A self-consistent approach for treating bad pixels is incorporated into the methods.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/21033856','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/21033856"><span id="translatedtitle">Development of CO2 laser dispersion <span class="hlt">interferometer</span> with photoelastic modulator.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Akiyama, T; Kawahata, K; Okajima, S; Nakayama, K</p> <p>2010-10-01</p> <p>A dispersion <span class="hlt">interferometer</span> is one of the promising methods of the electron density measurement on large and high density fusion devices. This paper describes development of a CO(2) laser dispersion <span class="hlt">interferometer</span> with a photoelastic modulator for phase modulation. In order to make the dispersion <span class="hlt">interferometer</span> free from variations of the detected intensity, a new phase extraction method is introduced: The phase shift is evaluated from a ratio of amplitudes of the fundamental and the second harmonics of the phase modulation frequency in the detected interference signal. The proof-of-principle experiments demonstrate the feasibility of this method. PMID:21033856</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/873765','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/873765"><span id="translatedtitle">Fourier-transform and global contrast <span class="hlt">interferometer</span> alignment methods</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Goldberg, Kenneth A. (Berkeley, CA)</p> <p>2001-01-01</p> <p>Interferometric methods are presented to facilitate alignment of image-plane components within an <span class="hlt">interferometer</span> and for the magnified viewing of <span class="hlt">interferometer</span> masks in situ. Fourier-transforms are performed on intensity patterns that are detected with the <span class="hlt">interferometer</span> and are used to calculate pseudo-images of the electric field in the image plane of the test optic where the critical alignment of various components is being performed. Fine alignment is aided by the introduction and optimization of a global contrast parameter that is easily calculated from the Fourier-transform.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19830005708','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19830005708"><span id="translatedtitle">Large-aperture <span class="hlt">interferometer</span> using local reference beam</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Howes, W. L.</p> <p>1982-01-01</p> <p>A large-aperture <span class="hlt">interferometer</span> was devised by adding a local-reference-beam-generating optical system to a schlieren system. Two versions of the <span class="hlt">interferometer</span> are demonstrated, one employing 12.7 cm (5 in.) diameter schlieren optics, the other employing 30.48 cm (12 in.) diameter parabolic mirrors in an off-axis system. In the latter configuration a cylindrical lens is introduced near the light source to correct for astigmatism. A zone plate is a satisfactory decollimating element in the reference-beam arm of the <span class="hlt">interferometer</span>. Attempts to increase the flux and uniformity of irradiance in the reference beam by using a diffuser are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://users.ece.gatech.edu/~lanterma/papers/LisaEhrman_Spie2003.pdf','EPRINT'); return false;" href="http://users.ece.gatech.edu/~lanterma/papers/LisaEhrman_Spie2003.pdf"><span id="translatedtitle">Automated Target Recognition Using Passive <span class="hlt">Radar</span> and Coordinated Flight Models</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Lanterman, Aaron</p> <p></p> <p>approach to ATR compares the <span class="hlt">Radar</span> Cross Section (RCS) of targets detected by a passive <span class="hlt">radar</span> system, Passive <span class="hlt">Radar</span>, Coordinated Flight Model, <span class="hlt">Radar</span> Cross Section 1. INTRODUCTION Passive <span class="hlt">radar</span> systems which if the <span class="hlt">Radar</span> Cross Section (RCS) of the targets vary "slowly" with small changes in these components</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://cds.cern.ch/record/451662/files/0008026.pdf','EPRINT'); return false;" href="http://cds.cern.ch/record/451662/files/0008026.pdf"><span id="translatedtitle">Conversion of conventional gravitational-wave <span class="hlt">interferometers</span> into QND <span class="hlt">interferometers</span> by modifying their input and/or output optics</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Kimble, H J; Matsko, A B; Thorne, K S; Vyatchanin, S P; Levin, Yuri; Matsko, Andrey B.; Thorne, Kip S.; Vyatchanin, Sergey P.</p> <p>2002-01-01</p> <p>The LIGO-II gravitational-wave <span class="hlt">interferometers</span> (ca. 2006--2008) are designed to have sensitivities at about the standard quantum limit (SQL) near 100 Hz. This paper describes and analyzes possible designs for subsequent, LIGO-III <span class="hlt">interferometers</span> that can beat the SQL. These designs are identical to a conventional broad-band <span class="hlt">interferometer</span> (without signal recycling), except for new input and/or output optics. Three designs are analyzed: (i) a "squeezed-input <span class="hlt">interferometer</span>" (conceived by Unruh based on earlier work of Caves) in which squeezed vacuum with frequency-dependent (FD) squeeze angle is injected into the <span class="hlt">interferometer</span>'s dark port; (ii) a "variational-output" <span class="hlt">interferometer</span> (conceived in a different form by Vyatchanin, Matsko and Zubova), in which homodyne detection with FD homodyne phase is performed on the output light; and (iii) a "squeezed-variational <span class="hlt">interferometer</span>" with squeezed input and FD-homodyne output. It is shown that the FD squeezed-input light can be produced by sending ordinary squeeze...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=PIA01348&hterms=congo+basin&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dcongo%2Bbasin','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=PIA01348&hterms=congo+basin&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dcongo%2Bbasin"><span id="translatedtitle"><span class="hlt">Radar</span> Mosaic of Africa</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1999-01-01</p> <p>This is an image of equatorial Africa, centered on the equator at longitude 15degrees east. This image is a mosaic of almost 4,000 separate images obtained in 1996 by the L-band imaging <span class="hlt">radar</span> onboard the Japanese Earth Resources Satellite. Using <span class="hlt">radar</span> to penetrate the persistent clouds prevalent in tropical forests, the Japanese Earth Resources Satellite was able for the first time to image at high resolution this continental scale region during single flooding seasons. The area shown covers about 7.4 million square kilometers (2.8 million square miles) of land surface, spans more than 5,000 kilometers(3,100 miles) east and west and some 2,000 kilometers (1,240 miles) north and south. North is up in this image. At the full resolution of the mosaic (100 meters or 330 feet), this image is more than 500 megabytes in size, and was processed from imagery totaling more than 60 gigabytes.<p/>Central Africa was imaged twice in 1996, once between January and March, which is the major low-flood season in the Congo Basin, and once between October and November, which is the major high-flood season in the Congo Basin. The red color corresponds to the data from the low-flood season, the green to the high-flood season, and the blue to the 'texture' of the low-flood data. The forests appear green as a result, the flooded and palm forests, as well as urban areas, appear yellow, the ocean and lakes appear black, and savanna areas appear blue, black or green, depending on the savanna type, surface topography and other factors. The areas of the image that are black and white were mapped only between January and March 1996. In these areas, the black areas are savanna or open water, the gray are forests, and the white areas are flooded forests or urban areas. The Congo River dominates the middle of the image, where the nearby forests that are periodically flooded by the Congo and its tributaries stand out as yellow. The Nile River flows north from Lake Victoria in the middle right of the color portion of the mosaic.<p/>This image is one of the products resulting from the Global Rain Forest Mapping project, a joint project between the National Space Development Agency of Japan, the Space Applications Institute of the Joint Research Centre of the European Commission, NASA's Jet Propulsion Laboratory and an international team of scientists. The goal of the Global Rain Forest Mapping mission is to map with the Japanese Earth Resources Satellite the world's tropical rain forests. The Japanese satellite was launched in 1992 by the National Space Development Agency of Japan and the Japanese Ministry of International Trade and Industry, with support from the Remote Sensing Technology Center of Japan.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_18 --> <div id="page_19" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="361"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005PhDT.......112Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005PhDT.......112Y"><span id="translatedtitle">Bistatic synthetic aperture <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yates, Gillian</p> <p></p> <p>Synthetic aperture <span class="hlt">radar</span> (SAR) allows all-weather, day and night, surface surveillance and has the ability to detect, classify and geolocate objects at long stand-off ranges. Bistatic SAR, where the transmitter and the receiver are on separate platforms, is seen as a potential means of countering the vulnerability of conventional monostatic SAR to electronic countermeasures, particularly directional jamming, and avoiding physical attack of the imaging platform. As the receiving platform can be totally passive, it does not advertise its position by RF emissions. The transmitter is not susceptible to jamming and can, for example, operate at long stand-off ranges to reduce its vulnerability to physical attack. This thesis examines some of the complications involved in producing high-resolution bistatic SAR imagery. The effect of bistatic operation on resolution is examined from a theoretical viewpoint and analytical expressions for resolution are developed. These expressions are verified by simulation work using a simple 'point by point' processor. This work is extended to look at using modern practical processing engines for bistatic geometries. Adaptations of the polar format algorithm and range migration algorithm are considered. The principal achievement of this work is a fully airborne demonstration of bistatic SAR. The route taken in reaching this is given, along with some results. The bistatic SAR imagery is analysed and compared to the monostatic imagery collected at the same time. Demonstrating high-resolution bistatic SAR imagery using two airborne platforms represents what I believe to be a European first and is likely to be the first time that this has been achieved outside the US (the UK has very little insight into US work on this topic). Bistatic target characteristics are examined through the use of simulations. This also compares bistatic imagery with monostatic and gives further insight into the utility of bistatic SAR.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.cawcr.gov.au/staff/aprotat/2011_JAMC_Protat_Williams_FallSpeed.pdf','EPRINT'); return false;" href="http://www.cawcr.gov.au/staff/aprotat/2011_JAMC_Protat_Williams_FallSpeed.pdf"><span id="translatedtitle">The Accuracy of <span class="hlt">Radar</span> Estimates of Ice Terminal Fall Speed from Vertically Pointing Doppler <span class="hlt">Radar</span> Measurements</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Protat, Alain</p> <p></p> <p>vertically pointing cloud <span class="hlt">radar</span>. For the observed vertical air motions, it is found that the mean vertical as a reference. It is found that the variability of the terminal fall speed­<span class="hlt">radar</span> reflectivity relationship (VtThe Accuracy of <span class="hlt">Radar</span> Estimates of Ice Terminal Fall Speed from Vertically Pointing Doppler <span class="hlt">Radar</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://sirius.bu.edu/aeronomy/2006JA012051_larsen.pdf','EPRINT'); return false;" href="http://sirius.bu.edu/aeronomy/2006JA012051_larsen.pdf"><span id="translatedtitle">Imaging coherent scatter <span class="hlt">radar</span>, incoherent scatter <span class="hlt">radar</span>, and optical observations of quasiperiodic structures associated with sporadic</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Mendillo, Michael</p> <p></p> <p>Imaging coherent scatter <span class="hlt">radar</span>, incoherent scatter <span class="hlt">radar</span>, and optical observations of quasiperiodic; published 20 June 2007. [1] During June and July 2002, a 30-MHz imaging coherent scatter <span class="hlt">radar</span> was installed scatter <span class="hlt">radar</span>. In six of those events, simultaneous measurements were made with the Arecibo 430-MHz</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ecd.bnl.gov/pubs/BNL-91137-2010-CP.pdf','EPRINT'); return false;" href="http://www.ecd.bnl.gov/pubs/BNL-91137-2010-CP.pdf"><span id="translatedtitle">VALIDATION OF A <span class="hlt">RADAR</span> DOPPLER SPECTRA SIMULATOR USING MEASUREMENTS FROM THE ARM CLOUD <span class="hlt">RADARS</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>VALIDATION OF A <span class="hlt">RADAR</span> DOPPLER SPECTRA SIMULATOR USING MEASUREMENTS FROM THE ARM CLOUD <span class="hlt">RADARS</span> to compare models with observations contains advantages and challenges. <span class="hlt">Radar</span> Doppler spectra simulators model output with the Doppler spectra recorded from the vertically pointing cloud <span class="hlt">radars</span> at the ARM</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.rci.rutgers.edu/~wub1/pubs/taes15_MIMOradar.pdf','EPRINT'); return false;" href="http://www.rci.rutgers.edu/~wub1/pubs/taes15_MIMOradar.pdf"><span id="translatedtitle">IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 1 MIMO-MC <span class="hlt">Radar</span>: A MIMO <span class="hlt">Radar</span> Approach</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Bajwa, Waheed U.</p> <p></p> <p>IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 1 MIMO-MC <span class="hlt">Radar</span>: A MIMO <span class="hlt">Radar</span> Approach Based. Petropulu, Fellow, IEEE Abstract--In a typical MIMO <span class="hlt">radar</span> scenario, transmit nodes transmit orthogonal, leads to target detection and parameter estimation. In MIMO <span class="hlt">radars</span> with compressive sensing (MIMO- CS</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec15-815.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... onboard <span class="hlt">radar</span>-equipped vessels of 300 GRT or over must hold an endorsement as <span class="hlt">radar</span> observer. (c) Each... service as master or mate onboard an uninspected towing vessel of 8 meters (26 feet) or more in...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/22163464','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/22163464"><span id="translatedtitle">Extended target recognition in cognitive <span class="hlt">radar</span> networks.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wei, Yimin; Meng, Huadong; Liu, Yimin; Wang, Xiqin</p> <p>2010-01-01</p> <p>We address the problem of adaptive waveform design for extended target recognition in cognitive <span class="hlt">radar</span> networks. A closed-loop active target recognition <span class="hlt">radar</span> system is extended to the case of a centralized cognitive <span class="hlt">radar</span> network, in which a generalized likelihood ratio (GLR) based sequential hypothesis testing (SHT) framework is employed. Using Doppler velocities measured by multiple <span class="hlt">radars</span>, the target aspect angle for each <span class="hlt">radar</span> is calculated. The joint probability of each target hypothesis is then updated using observations from different <span class="hlt">radar</span> line of sights (LOS). Based on these probabilities, a minimum correlation algorithm is proposed to adaptively design the transmit waveform for each <span class="hlt">radar</span> in an amplitude fluctuation situation. Simulation results demonstrate performance improvements due to the cognitive <span class="hlt">radar</span> network and adaptive waveform design. Our minimum correlation algorithm outperforms the eigen-waveform solution and other non-cognitive waveform design approaches. PMID:22163464</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/doepatents/biblio/907977','DOE-PATENT-XML'); return false;" href="http://www.osti.gov/doepatents/biblio/907977"><span id="translatedtitle">Obstacle penetrating dynamic <span class="hlt">radar</span> imaging system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Romero, Carlos E. (Livermore, CA); Zumstein, James E. (Livermore, CA); Chang, John T. (Danville, CA); Leach, Jr.. Richard R. (Castro Valley, CA)</p> <p>2006-12-12</p> <p>An obstacle penetrating dynamic <span class="hlt">radar</span> imaging system for the detection, tracking, and imaging of an individual, animal, or object comprising a multiplicity of low power ultra wideband <span class="hlt">radar</span> units that produce a set of return <span class="hlt">radar</span> signals from the individual, animal, or object, and a processing system for said set of return <span class="hlt">radar</span> signals for detection, tracking, and imaging of the individual, animal, or object. The system provides a <span class="hlt">radar</span> video system for detecting and tracking an individual, animal, or object by producing a set of return <span class="hlt">radar</span> signals from the individual, animal, or object with a multiplicity of low power ultra wideband <span class="hlt">radar</span> units, and processing said set of return <span class="hlt">radar</span> signals for detecting and tracking of the individual, animal, or object.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.era.lib.ed.ac.uk/handle/1842/1370','EPRINT'); return false;" href="http://www.era.lib.ed.ac.uk/handle/1842/1370"><span id="translatedtitle">Signal processing for airborne bistatic <span class="hlt">radar</span> </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Ong, Kian P</p> <p></p> <p>The major problem encountered by an airborne bistatic <span class="hlt">radar</span> is the suppression of bistatic clutter. Unlike clutter echoes for a sidelooking airborne monostatic <span class="hlt">radar</span>, bistatic clutter echoes are range dependent. Using ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://dspace.mit.edu/handle/1721.1/71175','EPRINT'); return false;" href="http://dspace.mit.edu/handle/1721.1/71175"><span id="translatedtitle">MIMO <span class="hlt">Radar</span> Waveform Constraints for GMTI</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Forsythe, Keith W.</p> <p></p> <p>Ground moving-target indication (GMTI) provides both an opportunity and challenge for coherent multiple-input multiple-output (MIMO) <span class="hlt">radar</span>. MIMO techniques can improve a <span class="hlt">radar</span>'s angle estimation and the minimum detectable ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://dspace.mit.edu/handle/1721.1/67462','EPRINT'); return false;" href="http://dspace.mit.edu/handle/1721.1/67462"><span id="translatedtitle">A Through-Dielectric <span class="hlt">Radar</span> Imaging System</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Charvat, Gregory L.</p> <p></p> <p>Through-lossy-slab <span class="hlt">radar</span> imaging will be shown at stand-off ranges using a low-power, ultrawideband (UWB), frequency modulated continuous wave (FMCW) <span class="hlt">radar</span> system. FMCW is desirable for through-slab applications because ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.H33D1387W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.H33D1387W"><span id="translatedtitle">SMAP <span class="hlt">RADAR</span> Processing and Calibration</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>West, R. D.; Jaruwatanadilok, S.; Kwoun, O.; Chaubell, M. J.</p> <p>2013-12-01</p> <p>The Soil Moisture Active Passive (SMAP) mission uses L-band <span class="hlt">radar</span> and radiometer measurements to estimate soil moisture with 4% volumetric accuracy at a resolution of 10 km, and freeze-thaw state at a resolution of 1-3 km. Model sensitivities translate the soil moisture accuracy to a <span class="hlt">radar</span> backscatter accuracy of 1 dB at 3 km resolution and a brightness temperature accuracy of 1.3 K at 40 km resolution. This presentation will describe the level 1 <span class="hlt">radar</span> processing and calibration challenges and the choices made so far for the algorithms and software implementation. To obtain the desired high spatial resolution the level 1 <span class="hlt">radar</span> ground processor employs synthetic aperture <span class="hlt">radar</span> (SAR) imaging techniques. Part of the challenge of the SMAP data processing comes from doing SAR imaging on a conically scanned system with rapidly varying squint angles. The <span class="hlt">radar</span> echo energy will be divided into range/Doppler bins using time domain processing algorithms that can easily follow the varying squint angle. For SMAP, projected range resolution is about 250 meters, while azimuth resolution varies from 400 meters to 1.2 km. Radiometric calibration of the SMAP <span class="hlt">radar</span> means measuring, characterizing, and where necessary correcting the gain and noise contributions from every part of the system from the antenna radiation pattern all the way to the ground processing algorithms. The SMAP antenna pattern will be computed using an accurate antenna model, and then validated post-launch using homogeneous external targets such as the Amazon rain forest to look for uncorrected gain variation. Noise subtraction is applied after image processing using measurements from a noise only channel. Variations of the internal electronics are tracked by a loopback measurement which will capture most of the time and temperature variations of the transmit power and receiver gain. Long-term variations of system performance due to component aging will be tracked and corrected using stable external reference targets. Candidate targets include the Amazon rain forest and a model-corrected global ocean measurement. Radio frequency interference (RFI) signals are expected in the L-band frequency window used by the SMAP <span class="hlt">radar</span> because many other users also operate in this band. Based on results of prior studies at JPL, SMAP L1 <span class="hlt">radar</span> processing will use a "Slow-time thresholding" or STT algorithm to handle RFI contamination. The STT technique looks at the slow-time series associated with a given range sample, sets an appropriate threshold, and identifies any samples that rise above this threshold as RFI events. The RFI events are removed and the data are azimuth compressed without those samples. Faraday rotation affects L-band signals by rotating the polarization vector during propagation through the ionosphere. This mixes HH, VV, HV, and VH results with each other introducing another source of error. The SMAP <span class="hlt">radar</span> is not fully polarimetric so the <span class="hlt">radar</span> data do not provide a correction by themselves. Instead a correction must be derived from other sources. L1 <span class="hlt">radar</span> processing will use estimates of Faraday rotation derived from externally supplied GPS-based measurements of the ionosphere total electron content (TEC). This work is supported by the SMAP project at the Jet Propulsion Laboratory, California Institute of Technology.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20020022889&hterms=snow+radar+reflectivity&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dsnow%2Bradar%2Breflectivity','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20020022889&hterms=snow+radar+reflectivity&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dsnow%2Bradar%2Breflectivity"><span id="translatedtitle">Airborne Differential Doppler Weather <span class="hlt">Radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Meneghini, R.; Bidwell, S.; Liao, L.; Rincon, R.; Heymsfield, G.; Hildebrand, Peter H. (Technical Monitor)</p> <p>2001-01-01</p> <p>The Precipitation <span class="hlt">Radar</span> aboard the Tropical Rain Measuring Mission (TRMM) Satellite has shown the potential for spaceborne sensing of snow and rain by means of an incoherent pulsed <span class="hlt">radar</span> operating at 13.8 GHz. The primary advantage of <span class="hlt">radar</span> relative to passive instruments arises from the fact that the <span class="hlt">radar</span> can image the 3-dimensional structure of storms. As a consequence, the <span class="hlt">radar</span> data can be used to determine the vertical rain structure, rain type (convective/stratiform) effective storm height, and location of the melting layer. The <span class="hlt">radar</span>, moreover, can be used to detect snow and improve the estimation of rain rate over land. To move toward spaceborne weather <span class="hlt">radars</span> that can be deployed routinely as part of an instrument set consisting of passive and active sensors will require the development of less expensive, lighter-weight <span class="hlt">radars</span> that consume less power. At the same time, the addition of a second frequency and an upgrade to Doppler capability are features that are needed to retrieve information on the characteristics of the drop size distribution, vertical air motion and storm dynamics. One approach to the problem is to use a single broad-band transmitter-receiver and antenna where two narrow-band frequencies are spaced apart by 5% to 10% of the center frequency. Use of Ka-band frequencies (26.5 GHz - 40 GHz) affords two advantages: adequate spatial resolution can be attained with a relatively small antenna and the differential reflectivity and mean Doppler signals are directly related to the median mass diameter of the snow and raindrop size distributions. The differential mean Doppler signal has the additional property that this quantity depends only on that part of the radial speed of the hydrometeors that is drop-size dependent. In principle, the mean and differential mean Doppler from a near-nadir viewing <span class="hlt">radar</span> can be used to retrieve vertical air motion as well as the total mean radial velocity. In the paper, we present theoretical calculations for the differential reflectivity and Doppler as functions of the center frequency, frequency difference, and median mass diameter. For a fixed pair of frequencies, the detectability of the differential signals can be expressed as the number of independent samples required to detect rain or snow with a particular median mass diameter. Because sampling numbers on the order of 1000 are needed to detect the differential signal over a range of size distributions, the instrument must be confined to a near-nadir, narrow swath. <span class="hlt">Radar</span> measurements from a zenith directed <span class="hlt">radar</span> operated at 9.1 GHz and 10 GHz are used to investigate the qualitative characteristics of the differential signals. Disdrometer and rain gauge data taken at the surface, just below the <span class="hlt">radar</span>, are used to test whether the differential signals can be used to estimate characteristics of the raindrop size distribution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1043296','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1043296"><span id="translatedtitle">Scanning ARM Cloud <span class="hlt">Radar</span> Handbook</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Widener, K; Bharadwaj, N; Johnson, K</p> <p>2012-06-18</p> <p>The scanning ARM cloud <span class="hlt">radar</span> (SACR) is a polarimetric Doppler <span class="hlt">radar</span> consisting of three different <span class="hlt">radar</span> designs based on operating frequency. These are designated as follows: (1) X-band SACR (X-SACR); (2) Ka-band SACR (Ka-SACR); and (3) W-band SACR (W-SACR). There are two SACRs on a single pedestal at each site where SACRs are deployed. The selection of the operating frequencies at each deployed site is predominantly determined by atmospheric attenuation at the site. Because RF attenuation increases with atmospheric water vapor content, ARM's Tropical Western Pacific (TWP) sites use the X-/Ka-band frequency pair. The Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites field the Ka-/W-band frequency pair. One ARM Mobile Facility (AMF1) has a Ka/W-SACR and the other (AMF2) has a X/Ka-SACR.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1011708','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1011708"><span id="translatedtitle">GMTI <span class="hlt">radar</span> minimum detectable velocity.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Richards, John Alfred</p> <p>2011-04-01</p> <p>Minimum detectable velocity (MDV) is a fundamental consideration for the design, implementation, and exploitation of ground moving-target indication (GMTI) <span class="hlt">radar</span> imaging modes. All single-phase-center air-to-ground <span class="hlt">radars</span> are characterized by an MDV, or a minimum radial velocity below which motion of a discrete nonstationary target is indistinguishable from the relative motion between the platform and the ground. Targets with radial velocities less than MDV are typically overwhelmed by endoclutter ground returns, and are thus not generally detectable. Targets with radial velocities greater than MDV typically produce distinct returns falling outside of the endoclutter ground returns, and are thus generally discernible using straightforward detection algorithms. This document provides a straightforward derivation of MDV for an air-to-ground single-phase-center GMTI <span class="hlt">radar</span> operating in an arbitrary geometry.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19920020146&hterms=sanchez&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dsanchez','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19920020146&hterms=sanchez&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dsanchez"><span id="translatedtitle">Goldstone solar system <span class="hlt">radar</span> signal processing</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Jurgens, R.; Satorius, E.; Sanchez, O.</p> <p>1992-01-01</p> <p>A performance analysis of the planetary <span class="hlt">radar</span> data acquisition system is presented. These results extend previous computer simulation analysis and are facilitated by the development of a simple analytical model that predicts <span class="hlt">radar</span> system performance over a wide range of operational parameters. The results of this study are useful to both the <span class="hlt">radar</span> system designer and the science investigator in establishing operational <span class="hlt">radar</span> data acquisition parameters which result in the best systems performance for a given set of input conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930016941&hterms=sanchez&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dsanchez','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930016941&hterms=sanchez&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dsanchez"><span id="translatedtitle">Goldstone solar system <span class="hlt">radar</span> signal processing</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Jurgens, R. F.; Satorius, E.; Sanchez, O.</p> <p>1992-01-01</p> <p>A performance analysis of the planetary <span class="hlt">radar</span> data acquisition system is presented. These results extend previous computer simulation analysis and are facilitated by the development of a simple analytical model that predicts <span class="hlt">radar</span> system performance over a wide range of operational parameters. The results of this study are useful to both the <span class="hlt">radar</span> systems designer and the science investigator in establishing operational <span class="hlt">radar</span> data acquisition parameters which result in the best systems performance for a given set of input conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/1210.1427.pdf','EPRINT'); return false;" href="http://arxiv.org/pdf/1210.1427.pdf"><span id="translatedtitle"><span class="hlt">Radar</span> reflection off extensive air showers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Stasielak, J; Bertaina, M; Blümer, J; Chiavassa, A; Engel, R; Haungs, A; Huege, T; Kampert, K -H; Klages, H; Kleifges, M; Krömer, O; Ludwig, M; Mathys, S; Neunteufel, P; Pekala, J; Rautenberg, J; Riegel, M; Roth, M; Salamida, F; Schieler, H; Šmída, R; Unger, M; Weber, M; Werner, F; Wilczy?ski, H; Wochele, J</p> <p>2012-01-01</p> <p>We investigate the possibility of detecting extensive air showers by the <span class="hlt">radar</span> technique. Considering a bistatic <span class="hlt">radar</span> system and different shower geometries, we simulate reflection of radio waves off the static plasma produced by the shower in the air. Using the Thomson cross-section for radio wave reflection, we obtain the time evolution of the signal received by the antennas. The frequency upshift of the <span class="hlt">radar</span> echo and the power received are studied to verify the feasibility of the <span class="hlt">radar</span> detection technique.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19800002036','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19800002036"><span id="translatedtitle">Shuttle orbiter <span class="hlt">radar</span> cross-sectional analysis</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Cooper, D. W.; James, R.</p> <p>1979-01-01</p> <p>Theoretical and model simulation studies on signal to noise levels and shuttle <span class="hlt">radar</span> cross section are described. Pre-mission system calibrations, system configuration, and postmission system calibration of the tracking <span class="hlt">radars</span> are described. Conversion of target range, azimuth, and elevation into <span class="hlt">radar</span> centered east north vertical position coordinates are evaluated. The location of the impinging rf energy with respect to the target vehicles body axis triad is calculated. Cross section correlation between the two <span class="hlt">radars</span> is presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1204106','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1204106"><span id="translatedtitle"><span class="hlt">Radar</span> operation in a hostile electromagnetic environment</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Doerry, Armin Walter</p> <p>2014-03-01</p> <p><span class="hlt">Radar</span> ISR does not always involve cooperative or even friendly targets. An adversary has numerous techniques available to him to counter the effectiveness of a <span class="hlt">radar</span> ISR sensor. These generally fall under the banner of jamming, spoofing, or otherwise interfering with the EM signals required by the <span class="hlt">radar</span> sensor. Consequently mitigation techniques are prudent to retain efficacy of the <span class="hlt">radar</span> sensor. We discuss in general terms a number of mitigation techniques.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_19 --> <div id="page_20" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="381"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2001eso..pres....6.','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2001eso..pres....6."><span id="translatedtitle">"First Light" for the VLT <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p></p> <p>2001-03-01</p> <p>Excellent Fringes From Bright Stars Prove VLTI Concept Summary Following the "First Light" for the fourth of the 8.2-m telescopes of the VLT Observatory on Paranal in September 2000, ESO scientists and engineers have just successfully accomplished the next major step of this large project. On March 17, 2001, "First Fringes" were obtained with the VLT <span class="hlt">Interferometer</span> (VLTI) - this important event corresponds to the "First Light" for an astronomical telescope. At the VLTI, it occurred when the infrared light from the bright star Sirius was captured by two small telescopes and the two beams were successfully combined in the subterranean Interferometric Laboratory to form the typical pattern of dark and bright lines known as " interferometric fringes ". This proves the success of the robust VLTI concept, in particular of the "Delay Line". On the next night, the VLTI was used to perform a scientific measurement of the angular diameter of another comparatively bright star, Alpha Hydrae ( Alphard ); it was found to be 0.00929±0.00017 arcsec . This corresponds to the angular distance between the two headlights of a car as seen from a distance of approx. 35,000 kilometres. The excellent result was obtained during a series of observations, each lasting 2 minutes, and fully confirming the impressive predicted abilities of the VLTI . This first observation with the VLTI is a monumental technological achievement, especially in terms of accuracy and stability . It crucially depends on the proper combination and functioning of a large number of individual opto-mechnical and electronic elements. This includes the test telescopes that capture the starlight, continuous and extremely precise adjustment of the various mirrors that deflect the light beams as well as the automatic positioning and motion of the Delay Line carriages and, not least, the optimal tuning of the VLT <span class="hlt">INterferometer</span> Commissionning Instrument (VINCI). These initial observations prove the overall concept for the VLTI . It was first envisaged in the early 1980's and has been continuously updated, as new technologies and materials became available during the intervening period. The present series of functional tests will go on for some time and involve many different configurations of the small telescopes and the instrument. It is then expected that the first combination of light beams from two of the VLT 8.2-m telescopes will take place in late 2001 . According to current plans, regular science observations will start from 2002, when the European and international astronomical community will have access to the full interferometric facility and the specially developed VLTI instrumentation now under construction. A wide range of scientific investigations will then become possible, from the search for planets around nearby stars, to the study of energetic processes at the cores of distant galaxies. With its superior angular resolution (image sharpness), the VLT is now beginning to open a new era in observational optical and infrared astronomy. The ambition of ESO is to make this type of observations available to all astronomers, not just the interferometry specialists. Video Clip 03/01 : Various video scenes related to the VLTI and the "First Fringes". PR Photo 10a/01 : "First Fringes" from the VLTI on the computer screen. PR Photo 10b/01 : Celebrating the VLTI "First Fringes" . PR Photo 10c/01 : Overview of the VLT <span class="hlt">Interferometer</span> . PR Photo 10d/01 : Interferometric observations: Fringes from two stars of different angular size . PR Photo 10e/01 : Interferometric observations: Change of fringes with increasing baseline . PR Photo 10f/01 : Aerial view of the installations for the VLTI on the Paranal platform. PR Photo 10g/01 : Stations for the VLTI Auxiliary Telescopes. PR Photo 10h/01 : A test siderostat in place for observations. PR Photo 10i/01 : A test siderostat ( close-up ). PR Photo 10j/01 : One of the Delay Line carriages in the Interferometric Tunnel. PR Photo 10k/01 : The VINCI instrume</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/23939094','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/23939094"><span id="translatedtitle">Orthogonal polarization Mirau <span class="hlt">interferometer</span> using reflective-type waveplate.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tapilouw, Abraham Mario; Chen, Liang-Chia; Jen, Yi-Jun; Lin, Shyh-Tsong; Yeh, Sheng-Lih</p> <p>2013-07-15</p> <p>This work proposes an orthogonal polarization Mirau interferometry using a reflective-type waveplate to generate different polarization orientations for broadband white light interferometry. The reflective-type half-waveplate is employed as the reference arm of the Mirau <span class="hlt">interferometer</span> to convert polarization and it generates a reference light with an orientation orthogonal to the object light. An advantage of the proposed <span class="hlt">interferometer</span> is its ability to control the ratio of light intensity between the object and reference arms to maximize the interferometric fringe contrast. Better, more accurate calibration of standard step height has been achieved by the developed <span class="hlt">interferometer</span>, which also can measure solder bumps that traditional Mirau <span class="hlt">interferometers</span> usually cannot measure. PMID:23939094</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=cavities&pg=4&id=EJ128376','ERIC'); return false;" href="http://eric.ed.gov/?q=cavities&pg=4&id=EJ128376"><span id="translatedtitle">Coupled-Cavity <span class="hlt">Interferometer</span> for the Optics Laboratory</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Peterson, R. W.</p> <p>1975-01-01</p> <p>Describes the construction of a flexible coupled-cavity <span class="hlt">interferometer</span> for student use. A helium-neon laser and phonograph turntable are the main components. Lists activities which may be performed with the apparatus. (Author/CP)</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://dspace.mit.edu/handle/1721.1/28741','EPRINT'); return false;" href="http://dspace.mit.edu/handle/1721.1/28741"><span id="translatedtitle">On the design of lithographic <span class="hlt">interferometers</span> and their application</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Walsh, Michael E. (Michael Edward), 1975-</p> <p>2004-01-01</p> <p>Interference lithography is presented as an ideal technique for fabricating large-area periodic structures with sub-100nm dimensions. A variety of <span class="hlt">interferometer</span> designs are discussed and implemented, each of which emphasizes ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/1503.01062.pdf','EPRINT'); return false;" href="http://arxiv.org/pdf/1503.01062.pdf"><span id="translatedtitle">Broadband detuned Sagnac <span class="hlt">interferometer</span> for future generation gravitational wave astronomy</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Voronchev, N V; Danilishin, S L</p> <p>2015-01-01</p> <p>Broadband suppression of quantum noise below the Standard Quantum Limit (SQL) becomes a top-priority problem for the future generation of large-scale terrestrial detectors of gravitational waves, as the <span class="hlt">interferometers</span> of the Advanced LIGO project, predesigned to be quantum-noise-limited in the almost entire detection band, are phased in. To this end, among various proposed methods of quantum noise suppression or signal amplification, the most elaborate approach implies a so-called *xylophone* configuration of two Michelson <span class="hlt">interferometers</span>, each optimised for its own frequency band, with a combined broadband sensitivity well below the SQL. Albeit ingenious, it is a rather costly solution. We demonstrate that changing the optical scheme to a Sagnac <span class="hlt">interferometer</span> with weak detuned signal recycling and frequency dependent input squeezing can do almost as good a job, as the xylophone for significantly lower spend. We also show that the Sagnac <span class="hlt">interferometer</span> is more robust to optical loss in filter cavity, used f...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://oaktrust.library.tamu.edu//handle/1969.1/149355','EPRINT'); return false;" href="http://oaktrust.library.tamu.edu//handle/1969.1/149355"><span id="translatedtitle">Feasibility of a Small Scale Intensity Correlation <span class="hlt">Interferometer</span> </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Kelderman, Gregory Peter</p> <p>2013-04-29</p> <p>Demand for high-resolution imaging capabilities for both space-based and ground-based imaging systems has created significant interest in improving the design of multi-aperture interferometry imaging systems. <span class="hlt">Interferometers</span> are a desirable...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.uml.edu/docs/Wolfe,%20Modul%20Submill%20laser_tcm18-42133.pdf','EPRINT'); return false;" href="http://www.uml.edu/docs/Wolfe,%20Modul%20Submill%20laser_tcm18-42133.pdf"><span id="translatedtitle">Modulated submillimeter laser <span class="hlt">interferometer</span> system for plasma density measurements</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Massachusetts at Lowell, University of</p> <p></p> <p>Modulated submillimeter laser <span class="hlt">interferometer</span> system for plasma density measurements S. M. Wolfe, K for measurement of electron densities in the 1014- cm- 3 S ne on opti- cally pumped submillimeter lasers, suitable for per- forming density measurements on the very</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110013600','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110013600"><span id="translatedtitle">Automatic Alignment of Displacement-Measuring <span class="hlt">Interferometer</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Halverson, Peter; Regehr, Martin; Spero, Robert; Alvarez-Salazar, Oscar; Loya, Frank; Logan, Jennifer</p> <p>2006-01-01</p> <p>A control system strives to maintain the correct alignment of a laser beam in an <span class="hlt">interferometer</span> dedicated to measuring the displacement or distance between two fiducial corner-cube reflectors. The correct alignment of the laser beam is parallel to the line between the corner points of the corner-cube reflectors: Any deviation from parallelism changes the length of the optical path between the reflectors, thereby introducing a displacement or distance measurement error. On the basis of the geometrical optics of corner-cube reflectors, the length of the optical path can be shown to be L = L(sub 0)cos theta, where L(sub 0) is the distance between the corner points and theta is the misalignment angle. Therefore, the measurement error is given by DeltaL = L(sub 0)(cos theta - 1). In the usual case in which the misalignment is small, this error can be approximated as DeltaL approximately equal to -L(sub 0)theta sup 2/2. The control system (see figure) is implemented partly in hardware and partly in software. The control system includes three piezoelectric actuators for rapid, fine adjustment of the direction of the laser beam. The voltages applied to the piezoelectric actuators include components designed to scan the beam in a circular pattern so that the beam traces out a narrow cone (60 microradians wide in the initial application) about the direction in which it is nominally aimed. This scan is performed at a frequency (2.5 Hz in the initial application) well below the resonance frequency of any vibration of the <span class="hlt">interferometer</span>. The laser beam makes a round trip to both corner-cube reflectors and then interferes with the launched beam. The interference is detected on a photodiode. The length of the optical path is measured by a heterodyne technique: A 100- kHz frequency shift between the launched beam and a reference beam imposes, on the detected signal, an interferometric phase shift proportional to the length of the optical path. A phase meter comprising analog filters and specialized digital circuitry converts the phase shift to an indication of displacement, generating a digital signal proportional to the path length.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.atmos.colostate.edu/gradprog/syllabi/AT741%20Syllabus_sp13.pdf','EPRINT'); return false;" href="http://www.atmos.colostate.edu/gradprog/syllabi/AT741%20Syllabus_sp13.pdf"><span id="translatedtitle">Course Syllabus Course name: <span class="hlt">Radar</span> Meteorology</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Collett Jr., Jeffrey L.</p> <p></p> <p>Course Syllabus Course name: <span class="hlt">Radar</span> Meteorology Course number: AT741 Instructor: Prof. Steven a foundational understanding of <span class="hlt">radar</span> meteorology. Topics presented include microwave scattering theory, Doppler is to provide the student with a working knowledge of <span class="hlt">radar</span> meteorology including applications to remote sensing</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www-pw.physics.uiowa.edu/~dag/publications/2005_RadarSoundingsOfTheIonosphereOfMars_SCIENCE.pdf','EPRINT'); return false;" href="http://www-pw.physics.uiowa.edu/~dag/publications/2005_RadarSoundingsOfTheIonosphereOfMars_SCIENCE.pdf"><span id="translatedtitle"><span class="hlt">Radar</span> Soundings of the Ionosphere of Mars</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Gurnett, Donald A.</p> <p></p> <p><span class="hlt">Radar</span> Soundings of the Ionosphere of Mars D. A. Gurnett,1 * D. L. Kirchner,1 R. L. Huff,1 D. D4 We report the first <span class="hlt">radar</span> soundings of the ionosphere of Mars with the MARSIS (Mars Advanced <span class="hlt">Radar</span> for Subsurface and Ionosphere Sounding) instrument on board the orbiting Mars Express spacecraft. Several types</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec184-404.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping... Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec121-404.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec121-404.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec108-717.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping...Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1...coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec184-404.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping... Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec169-726.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169...Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec130-310.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping... Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec169-726.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169...Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec167-40-40.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40...Equipment Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels...coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec15-815.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815...REQUIREMENTS Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in...vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold an endorsement...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_20 --> <div id="page_21" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="401"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec130-310.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping... Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec121-404.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec11-480.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480...Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains...that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec121-404.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec184-404.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping... Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec130-310.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping... Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec167-40-40.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40...Equipment Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels...coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec167-40-40.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40...Equipment Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels...coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec11-480.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480...Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains...that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec184-404.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping... Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec11-480.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480...Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains...that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec184-404.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping... Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec130-310.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping... Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec11-480.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480...Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains...that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec130-310.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping... Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec169-726.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169...Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec108-717.pdf','CFR2013'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>...2013-10-01 2013-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping...Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1...coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec15-815.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815...REQUIREMENTS Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in...inspected vessels of 300 GRT or over which are <span class="hlt">radar</span> equipped, must hold an endorsement...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec15-815.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815...REQUIREMENTS Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in...vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold an endorsement...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec15-815.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815...REQUIREMENTS Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in...vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold an endorsement...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_21 --> <div id="page_22" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="421"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec169-726.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169...Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec11-480.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480...Deck Officer Endorsements § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains...that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (b) If an applicant...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec169-726.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169...Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec167-40-40.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40...Equipment Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels...coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec121-404.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec121-404.pdf"><span id="translatedtitle">46 CFR 121.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radars</span>. 121.404 Section 121.404 Shipping... Navigation Equipment § 121.404 <span class="hlt">Radars</span>. (a) Except as allowed by paragraph...Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface navigation with...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec108-717.pdf','CFR2014'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>...2014-10-01 2014-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping...Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1...coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec167-40-40.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40...Equipment Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels...coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec108-717.pdf','CFR'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>...2010-10-01 2010-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping...Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1...coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec108-717.pdf','CFR2012'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>...2012-10-01 2012-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping...Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1...coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec15-815.pdf','CFR2011'); return false;" href="http://www.gpo.gov:80/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>...2011-10-01 2011-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815...REQUIREMENTS Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in...vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold an endorsement...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19720017419&hterms=Animal+migration&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3D%2528Animal%2Bmigration%2529','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19720017419&hterms=Animal+migration&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3D%2528Animal%2Bmigration%2529"><span id="translatedtitle">Tracking <span class="hlt">radar</span> studies of bird migration</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Williams, T. C.; Williams, J. M.; Teal, J. M.; Kanwisher, J. W.</p> <p>1972-01-01</p> <p>The application of tracking <span class="hlt">radar</span> for determining the flight paths of migratory birds is discussed. The effects produced by various meteorological parameters are described. Samples of <span class="hlt">radar</span> scope presentations obtained during tracking studies are presented. The characteristics of the <span class="hlt">radars</span> and their limitations are examined.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4644244','PMC'); return false;" href="http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4644244"><span id="translatedtitle">Comparison of <span class="hlt">radar</span> data versus rainfall data</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Espinosa, B.; Hromadka, T.V.; Perez, R.</p> <p>2015-01-01</p> <p>Doppler <span class="hlt">radar</span> data are increasingly used in rainfall-runoff synthesis studies, perhaps due to <span class="hlt">radar</span> data availability, among other factors. However, the veracity of the <span class="hlt">radar</span> data are often a topic of concern. In this paper, three Doppler <span class="hlt">radar</span> outcomes developed by the United States National Weather Service at three <span class="hlt">radar</span> sites are examined and compared to actual rain gage data for two separate severe storm events in order to assess accuracy in the published <span class="hlt">radar</span> estimates of rainfall. Because the subject storms were very intense rainfall events lasting approximately one hour in duration, direct comparisons between the three <span class="hlt">radar</span> gages themselves can be made, as well as a comparison to rain gage data at a rain gage location subjected to the same storm cells. It is shown that topographic interference with the <span class="hlt">radar</span> outcomes can be a significant factor leading to differences between <span class="hlt">radar</span> and rain gage readings, and that care is needed in calibrating <span class="hlt">radar</span> outcomes using available rain gage data in order to interpolate rainfall estimates between rain gages using the spatial variation observed in the <span class="hlt">radar</span> readings. The paper establishes and describes•the need for “ground-truthing” of <span class="hlt">radar</span> data, and•possible errors due to topographic interference. PMID:26649276</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec167-40-40.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 7 2012-10-01 2012-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40 Shipping COAST GUARD... Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels of 1,600 gross tons and over in ocean or coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation. Facilities for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ese.wustl.edu/~nehorai/MURI/publications/Book_Moran_07.pdf','EPRINT'); return false;" href="http://www.ese.wustl.edu/~nehorai/MURI/publications/Book_Moran_07.pdf"><span id="translatedtitle">APPLICATION OF SENSOR SCHEDULING CONCEPTS TO <span class="hlt">RADAR</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Nehorai, Arye</p> <p></p> <p>Chapter 10 APPLICATION OF SENSOR SCHEDULING CONCEPTS TO <span class="hlt">RADAR</span> William Moran University of Melbourne time illustrating the ideas on sensor schedul- ing in a specific context: that of a <span class="hlt">radar</span> system. A typical pulse <span class="hlt">radar</span> system operates by illuminating a scene with a short pulse of electromagnetic energy</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec130-310.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 4 2014-10-01 2014-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping COAST GUARD... EQUIPMENT AND SYSTEMS Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the pilothouse....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec167-40-40.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 7 2014-10-01 2014-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40 Shipping COAST GUARD... Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels of 1,600 gross tons and over in ocean or coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation. Facilities for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec167-40-40.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 7 2010-10-01 2010-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40 Shipping COAST GUARD... Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels of 1,600 gross tons and over in ocean or coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation. Facilities for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec108-717.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 4 2013-10-01 2013-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping COAST GUARD... Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1,600 gross tons and over in ocean or coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and (b) Facilities on...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec11-480.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 1 2013-10-01 2013-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480 Shipping COAST... ENDORSEMENTS Professional Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains the requirements that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter specifies...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec184-404.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 7 2012-10-01 2012-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping COAST GUARD... MISCELLANEOUS SYSTEMS AND EQUIPMENT Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with a Federal Communications Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_22 --> <div id="page_23" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="441"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec11-480.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 1 2011-10-01 2011-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480 Shipping COAST... ENDORSEMENTS Professional Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains the requirements that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter specifies...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec108-717.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 4 2011-10-01 2011-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping COAST GUARD... Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1,600 gross tons and over in ocean or coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and (b) Facilities on...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec169-726.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 7 2010-10-01 2010-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169.726 Shipping COAST... Control, Miscellaneous Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design while underway. Markings...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec11-480.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 1 2012-10-01 2012-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480 Shipping COAST... ENDORSEMENTS Professional Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains the requirements that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter specifies...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.physics.irfu.se/Publications/Presentations/Thide:ISRS:2005.pdf','EPRINT'); return false;" href="http://www.physics.irfu.se/Publications/Presentations/Thide:ISRS:2005.pdf"><span id="translatedtitle">EISCAT <span class="hlt">Radar</span> School, Kiruna, 2005 Outrigger in</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>EISCAT <span class="hlt">Radar</span> School, Kiruna, 2005 LOFAR Outrigger in Scandinavia Physics in Space Programme LOFAR Centre, Växjö University #12;Bo Thidé EISCAT <span class="hlt">Radar</span> School, Kiruna,, 20052 LOFAR Low Frequency Array (10 radio system for space radio #12;Bo Thidé EISCAT <span class="hlt">Radar</span> School, Kiruna,, 20053 Hydrogen radiates at 1420</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec169-726.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 7 2014-10-01 2014-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169.726 Shipping COAST... Control, Miscellaneous Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design while underway. Markings...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec169-726.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 7 2011-10-01 2011-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169.726 Shipping COAST... Control, Miscellaneous Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design while underway. Markings...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec15-815.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol1/pdf/CFR-2012-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 1 2012-10-01 2012-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815 Shipping COAST... Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in the required complement of deck officers, including the master, on inspected vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec108-717.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 4 2010-10-01 2010-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping COAST GUARD... Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1,600 gross tons and over in ocean or coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and (b) Facilities on...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec108-717.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol4/pdf/CFR-2014-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 4 2014-10-01 2014-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping COAST GUARD... Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1,600 gross tons and over in ocean or coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and (b) Facilities on...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec184-404.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 7 2011-10-01 2011-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping COAST GUARD... MISCELLANEOUS SYSTEMS AND EQUIPMENT Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with a Federal Communications Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://eric.ed.gov/?q=radar&id=EJ975249','ERIC'); return false;" href="http://eric.ed.gov/?q=radar&id=EJ975249"><span id="translatedtitle">Efficient Ways to Learn Weather <span class="hlt">Radar</span> Polarimetry</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Cao, Qing; Yeary, M. B.; Zhang, Guifu</p> <p>2012-01-01</p> <p>The U.S. weather <span class="hlt">radar</span> network is currently being upgraded with dual-polarization capability. Weather <span class="hlt">radar</span> polarimetry is an interdisciplinary area of engineering and meteorology. This paper presents efficient ways to learn weather <span class="hlt">radar</span> polarimetry through several basic and practical topics. These topics include: 1) hydrometeor scattering model…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.math.colostate.edu/~cheney/papers/WangCheneyBordenTAESGUTreprint.pdf','EPRINT'); return false;" href="http://www.math.colostate.edu/~cheney/papers/WangCheneyBordenTAESGUTreprint.pdf"><span id="translatedtitle">Multistatic <span class="hlt">Radar</span> Imaging of Moving Targets</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Cheney, Margaret</p> <p></p> <p>Multistatic <span class="hlt">Radar</span> Imaging of Moving Targets LING WANG, Member, IEEE MARGARET CHENEY, Member, IEEE that in special cases, the theory reduces to: 1) range-Doppler imaging, 2) inverse synthetic aperture <span class="hlt">radar</span> (ISAR), 3) synthetic aperture <span class="hlt">radar</span> (SAR), 4) Doppler SAR, and 5) tomography of moving targets. Manuscript</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec184-404.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol7/pdf/CFR-2010-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 7 2010-10-01 2010-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping COAST GUARD... MISCELLANEOUS SYSTEMS AND EQUIPMENT Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with a Federal Communications Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec15-815.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol1/pdf/CFR-2011-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 1 2011-10-01 2011-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815 Shipping COAST... Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in the required complement of deck officers, including the master, on inspected vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.rsmas.miami.edu/assets/pdfs/upper-ocean-dynamics/Shay_1997_Oceanography.pdf','EPRINT'); return false;" href="http://www.rsmas.miami.edu/assets/pdfs/upper-ocean-dynamics/Shay_1997_Oceanography.pdf"><span id="translatedtitle">WAVE-DRIVEN SURFACE FROM HF <span class="hlt">RADAR</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Miami, University of</p> <p></p> <p>FEATURE INTERNAL CURRENTS WAVE-DRIVEN SURFACE FROM HF <span class="hlt">RADAR</span> By Lynn K. Shay Observations from-fre- quency (HF) <span class="hlt">radar</span> have revealed that not only are the low-frequency and tidal currents resolved of the horizontal flow structure from HF <span class="hlt">radar</span> pro- vides the spatial context for moored and ship- based</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec167-40-40.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 7 2013-10-01 2013-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40 Shipping COAST GUARD... Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels of 1,600 gross tons and over in ocean or coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation. Facilities for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec11-480.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol1/pdf/CFR-2014-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 1 2014-10-01 2014-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480 Shipping COAST... ENDORSEMENTS Professional Requirements for National Deck Officer Endorsements § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains the requirements that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (b) If...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec184-404.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol7/pdf/CFR-2014-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 7 2014-10-01 2014-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping COAST GUARD... MISCELLANEOUS SYSTEMS AND EQUIPMENT Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with a Federal Communications Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec130-310.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol4/pdf/CFR-2011-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 4 2011-10-01 2011-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping COAST GUARD... EQUIPMENT AND SYSTEMS Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the pilothouse....</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_23 --> <div id="page_24" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="461"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec130-310.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol4/pdf/CFR-2010-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 4 2010-10-01 2010-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping COAST GUARD... EQUIPMENT AND SYSTEMS Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the pilothouse....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec108-717.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec108-717.pdf"><span id="translatedtitle">46 CFR 108.717 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 4 2012-10-01 2012-10-01 false <span class="hlt">Radar</span>. 108.717 Section 108.717 Shipping COAST GUARD... Miscellaneous Equipment § 108.717 <span class="hlt">Radar</span>. Each self-propelled unit of 1,600 gross tons and over in ocean or coastwise service must have— (a) A marine <span class="hlt">radar</span> system for surface navigation; and (b) Facilities on...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec169-726.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol7/pdf/CFR-2012-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 7 2012-10-01 2012-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169.726 Shipping COAST... Control, Miscellaneous Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design while underway. Markings...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec15-815.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol1/pdf/CFR-2013-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 1 2013-10-01 2013-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815 Shipping COAST... Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in the required complement of deck officers, including the master, on inspected vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec184-404.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec184-404.pdf"><span id="translatedtitle">46 CFR 184.404 - <span class="hlt">Radars</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 7 2013-10-01 2013-10-01 false <span class="hlt">Radars</span>. 184.404 Section 184.404 Shipping COAST GUARD... MISCELLANEOUS SYSTEMS AND EQUIPMENT Navigation Equipment § 184.404 <span class="hlt">Radars</span>. (a) A vessel must be fitted with a Federal Communications Commission (FCC) type accepted general marine <span class="hlt">radar</span> system for surface...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec130-310.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol4/pdf/CFR-2012-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 4 2012-10-01 2012-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping COAST GUARD... EQUIPMENT AND SYSTEMS Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the pilothouse....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec130-310.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol4/pdf/CFR-2013-title46-vol4-sec130-310.pdf"><span id="translatedtitle">46 CFR 130.310 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 4 2013-10-01 2013-10-01 false <span class="hlt">Radar</span>. 130.310 Section 130.310 Shipping COAST GUARD... EQUIPMENT AND SYSTEMS Navigational Equipment § 130.310 <span class="hlt">Radar</span>. Each vessel of 100 or more gross tons must be fitted with a general marine <span class="hlt">radar</span> in the pilothouse....</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec11-480.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec11-480.pdf"><span id="translatedtitle">46 CFR 11.480 - <span class="hlt">Radar</span> observer.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 1 2010-10-01 2010-10-01 false <span class="hlt">Radar</span> observer. 11.480 Section 11.480 Shipping COAST... ENDORSEMENTS Professional Requirements for Deck Officers § 11.480 <span class="hlt">Radar</span> observer. (a) This section contains the requirements that an applicant must meet to qualify as a <span class="hlt">radar</span> observer. (Part 15 of this chapter specifies...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec167-40-40.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol7/pdf/CFR-2011-title46-vol7-sec167-40-40.pdf"><span id="translatedtitle">46 CFR 167.40-40 - <span class="hlt">Radar</span>.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 7 2011-10-01 2011-10-01 false <span class="hlt">Radar</span>. 167.40-40 Section 167.40-40 Shipping COAST GUARD... Requirements § 167.40-40 <span class="hlt">Radar</span>. All mechanically propelled vessels of 1,600 gross tons and over in ocean or coastwise service must be fitted with a marine <span class="hlt">radar</span> system for surface navigation. Facilities for...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec169-726.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol7/pdf/CFR-2013-title46-vol7-sec169-726.pdf"><span id="translatedtitle">46 CFR 169.726 - <span class="hlt">Radar</span> reflector.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 7 2013-10-01 2013-10-01 false <span class="hlt">Radar</span> reflector. 169.726 Section 169.726 Shipping COAST... Control, Miscellaneous Systems, and Equipment § 169.726 <span class="hlt">Radar</span> reflector. Each nonmetallic vessel less than 90 feet in length must exhibit a <span class="hlt">radar</span> reflector of suitable size and design while underway. Markings...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec15-815.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol1/pdf/CFR-2010-title46-vol1-sec15-815.pdf"><span id="translatedtitle">46 CFR 15.815 - <span class="hlt">Radar</span> observers.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 1 2010-10-01 2010-10-01 false <span class="hlt">Radar</span> observers. 15.815 Section 15.815 Shipping COAST... Computations § 15.815 <span class="hlt">Radar</span> observers. (a) Each person in the required complement of deck officers, including the master, on inspected vessels of 300 gross tons or over which are <span class="hlt">radar</span> equipped, shall hold...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPhCS.588a2046S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPhCS.588a2046S"><span id="translatedtitle">Microwave Doppler <span class="hlt">radar</span> in unobtrusive health monitoring</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Silva Girão, P.; Postolache, O.; Postolache, G.; Ramos, P. M.; Dias Pereira, J. M.</p> <p>2015-02-01</p> <p>This article frames the use of microwave Doppler <span class="hlt">radar</span> in the context of ubiquitous, non-obstructive health monitoring. The use of a 24GHz CW (continuous wave) Doppler <span class="hlt">radar</span> based on a commercial off-the-shelf transceiver for remote sensing of heart rate and respiration rate based on the acquisition and processing of the signals delivered by the <span class="hlt">radar</span> is briefly presented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19740038739&hterms=geomorphology&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dgeomorphology','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19740038739&hterms=geomorphology&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dgeomorphology"><span id="translatedtitle"><span class="hlt">Radar</span> geomorphology of coastal and wetland environments</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Lewis, A. J.; Macdonald, H. C.</p> <p>1973-01-01</p> <p>Details regarding the collection of <span class="hlt">radar</span> imagery over the past ten years are considered together with the geomorphic, geologic, and hydrologic data which have been extracted from <span class="hlt">radar</span> imagery. Recent investigations were conducted of the Louisiana swamp marsh and the Oregon coast. It was found that <span class="hlt">radar</span> imagery is a useful tool to the scientist involved in wetland research.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvA..92e3619M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvA..92e3619M"><span id="translatedtitle">Large-momentum-transfer Bragg <span class="hlt">interferometer</span> with strontium atoms</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mazzoni, T.; Zhang, X.; Del Aguila, R.; Salvi, L.; Poli, N.; Tino, G. M.</p> <p>2015-11-01</p> <p>We report on an atom <span class="hlt">interferometer</span> based on Bragg diffraction in a fountain of alkaline-earth-metal atoms, namely 88Sr. We demonstrate large momentum transfer to the atoms up to eight photon recoils and the use of the <span class="hlt">interferometer</span> as a gravimeter with a sensitivity ? g /g =4 ×10-8 . Thanks to the special characteristics of strontium atoms for precision measurements, this result introduces alternate possibilities for experiments in fundamental and applied physics.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20050147481&hterms=lisa&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dlisa','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20050147481&hterms=lisa&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D90%26Ntt%3Dlisa"><span id="translatedtitle">Polarization Considerations for the Laser <span class="hlt">Interferometer</span> Space Antenna (LISA)</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Waluschka, Eugene; Pedersen, Trace R.; McNamara, Paul</p> <p>2005-01-01</p> <p>A polarization ray trace model of the Laser <span class="hlt">Interferometer</span> Space Antenna's (LISA) optical path is being created. The model will be able to assess the effects of various polarizing elements and the optical coatings on the required picometer level interferometry. All of the computational steps are described in detail. This should eliminate any ambiguities associated with polarization ray trace modeling of <span class="hlt">interferometers</span> and provide a basis for determining its limitations and serve as a clearly defined starting point for future improvements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/1510.07939.pdf','EPRINT'); return false;" href="http://arxiv.org/pdf/1510.07939.pdf"><span id="translatedtitle">Large-momentum-transfer Bragg <span class="hlt">interferometer</span> with strontium atoms</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Mazzoni, T; Del Aguila, R; Salvi, L; Poli, N; Tino, G M</p> <p>2015-01-01</p> <p>We report on the first atom <span class="hlt">interferometer</span> based on Bragg diffraction in a fountain of alkaline-earth atoms, namely $^{88}$Sr. We demonstrate large momentum transfer to the atoms up to eight photon recoils and the use of the <span class="hlt">interferometer</span> as a gravimeter with a sensitivity $\\delta g/g=4\\times 10^{-8}$. Thanks to the special characteristics of strontium atoms for precision measurements, this result opens a new way for experiments in fundamental and applied physics.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://arxiv.org/pdf/1410.2267v2','EPRINT'); return false;" href="http://arxiv.org/pdf/1410.2267v2"><span id="translatedtitle">Observation of a classical cheshire cat in an optical <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>David P. Atherton; Gambhir Ranjit; Andrew A. Geraci; Jonathan D. Weinstein</p> <p>2015-03-03</p> <p>A recent neutron interferometry experiment claims to demonstrate a paradoxical phenomena dubbed the "quantum Cheshire Cat" \\cite{Denkmayr2014}. We have reproduced and extended these results with an equivalent optical <span class="hlt">interferometer</span>. The results suggest that the photon travels through one arm of the <span class="hlt">interferometer</span>, while its polarization travels through the other. However, we show that these experimental results belong to the domain where quantum and classical wave theories coincide; there is nothing uniquely quantum about the illusion of this cheshire cat.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=PIA01302&hterms=lost+city&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dlost%2Bcity','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=PIA01302&hterms=lost+city&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Dlost%2Bcity"><span id="translatedtitle">Space <span class="hlt">radar</span> image of Ubar optical/<span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1995-01-01</p> <p>This pair of images from space shows a portion of the southern Empty Quarter of the Arabian Peninsula in the country of Oman. On the left is a <span class="hlt">radar</span> image of the region around the site of the fabled Lost City of Ubar, discovered in 1992 with the aid of remote sensing data. On the right is an enhanced optical image taken by the shuttle astronauts. Ubar existed from about 2800 BC to about 300 AD. and was a remote desert outpost where caravans were assembled for the transport of frankincense across the desert. The actual site of the fortress of the Lost City of Ubar, currently under excavation, is too small to show in either image. However, tracks leading to the site, and surrounding tracks, show as prominent, but diffuse, reddish streaks in the <span class="hlt">radar</span> image. Although used in modern times, field investigations show many of these tracks were in use in ancient times as well. Mapping of these tracks on regional remote sensing images provided by the Landsat satellite was a key to recognizing the site as Ubar. The prominent magenta colored area is a region of large sand dunes. The green areas are limestone rocks, which form a rocky desert floor. A major wadi, or dry stream bed, runs across the scene and appears as a white line. The <span class="hlt">radar</span> images, and ongoing field investigations, will help shed light on an early civilization about which little in known. The <span class="hlt">radar</span> image was taken by the Spaceborne Imaging <span class="hlt">Radar</span> C/X-Band Synthetic Aperture <span class="hlt">Radar</span> (SIR-C/X-SAR) and is centered at 18 degrees North latitude and 53 degrees East longitude. The image covers an area about 50 kilometers by 100 kilometers (31 miles by 62 miles). The colors in the image are assigned to different frequencies and polarizations of the <span class="hlt">radar</span> as follows: red is L-band, horizontally transmitted, horizontally received; blue is C-band horizontally transmitted, horizontally received; green is L-band horizontally transmitted, vertically received. SIR-C/X-SAR, a joint mission of the German, Italian and the United States space agencies, is part of NASA's Mission to Planet Earth.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ncbi.nlm.nih.gov/pubmed/25173242','PUBMED'); return false;" href="http://www.ncbi.nlm.nih.gov/pubmed/25173242"><span id="translatedtitle">Highly stable polarization independent Mach-Zehnder <span class="hlt">interferometer</span>.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mi?uda, Michal; Doláková, Ester; Straka, Ivo; Miková, Martina; Dušek, Miloslav; Fiurášek, Jaromír; Ježek, Miroslav</p> <p>2014-08-01</p> <p>We experimentally demonstrate optical Mach-Zehnder <span class="hlt">interferometer</span> utilizing displaced Sagnac configuration to enhance its phase stability. The <span class="hlt">interferometer</span> with footprint of 27×40 cm offers individually accessible paths and shows phase deviation less than 0.4° during a 250 s long measurement. The phase drift, evaluated by means of Allan deviation, stays below 3° or 7 nm for 1.5 h without any active stabilization. The polarization insensitive design is verified by measuring interference visibility as a function of input polarization. For both <span class="hlt">interferometer</span>'s output ports and all tested polarization states the visibility stays above 93%. The discrepancy in visibility for horizontal and vertical polarization about 3.5% is caused mainly by undesired polarization dependence of splitting ratio of the beam splitter used. The presented <span class="hlt">interferometer</span> device is suitable for quantum-information and other sensitive applications where active stabilization is complicated and common-mode <span class="hlt">interferometer</span> is not an option as both the <span class="hlt">interferometer</span> arms have to be accessible individually. PMID:25173242</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/biblio/22314649','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/biblio/22314649"><span id="translatedtitle">Highly stable polarization independent Mach-Zehnder <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mi?uda, Michal Doláková, Ester; Straka, Ivo; Miková, Martina; Dušek, Miloslav; Fiurášek, Jaromír; Ježek, Miroslav</p> <p>2014-08-15</p> <p>We experimentally demonstrate optical Mach-Zehnder <span class="hlt">interferometer</span> utilizing displaced Sagnac configuration to enhance its phase stability. The <span class="hlt">interferometer</span> with footprint of 27×40 cm offers individually accessible paths and shows phase deviation less than 0.4° during a 250 s long measurement. The phase drift, evaluated by means of Allan deviation, stays below 3° or 7 nm for 1.5 h without any active stabilization. The polarization insensitive design is verified by measuring interference visibility as a function of input polarization. For both <span class="hlt">interferometer</span>'s output ports and all tested polarization states the visibility stays above 93%. The discrepancy in visibility for horizontal and vertical polarization about 3.5% is caused mainly by undesired polarization dependence of splitting ratio of the beam splitter used. The presented <span class="hlt">interferometer</span> device is suitable for quantum-information and other sensitive applications where active stabilization is complicated and common-mode <span class="hlt">interferometer</span> is not an option as both the <span class="hlt">interferometer</span> arms have to be accessible individually.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_24 --> <div id="page_25" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="481"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015ApPhL.107l1106W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015ApPhL.107l1106W"><span id="translatedtitle">Experimental implementation of phase locking in a nonlinear <span class="hlt">interferometer</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Hailong; Marino, A. M.; Jing, Jietai</p> <p>2015-09-01</p> <p>Based upon two cascade four-wave mixing processes in two identical hot rubidium vapor cells, a nonlinear <span class="hlt">interferometer</span> has been experimentally realized [Jing et al., Appl. Phys. Lett. 99, 011110 (2011); Hudelist et al., Nat. Commun. 5, 3049 (2014)]. It has a higher degree of phase sensitivity than a traditional linear <span class="hlt">interferometer</span> and has many potential applications in quantum metrology. Phase locking of the nonlinear <span class="hlt">interferometer</span> is needed before it can find its way into applications. In this letter, we investigate the experimental implementation of phase locking of the relative phase between the three beams at different frequencies involved in such a nonlinear <span class="hlt">interferometer</span>. We have utilized two different methods, namely, beat note locking and coherent modulation locking. We find that coherent modulation locking can achieve much better phase stability than beat note locking in our system. Our results pave the way for real applications of a nonlinear <span class="hlt">interferometer</span> in precision measurement and quantum manipulation, for example, phase control in phase-sensitive N-wave mixing process, N-port nonlinear <span class="hlt">interferometer</span> and quantum-enhanced real-time phase tracking.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19920003627','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19920003627"><span id="translatedtitle"><span class="hlt">Radar</span> interferometric studies of comets</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Snyder, Lewis E.; Palmer, Patrick; Depater, Imke</p> <p>1991-01-01</p> <p>Our objectives are to use radio interferometry to study composition, velocity distribution, maser excitation, and plasma interactions of cometary gas. Two new cometary chemistry programs were started with radio <span class="hlt">interferometers</span>: (1) the VLA used to search for HC3N emission from Comet Brorsen-Metcalf at 3.3 cm wavelength; and (2) the BIMA millimeter array used to observe Comet Austin in HCN.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1020273','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1020273"><span id="translatedtitle">Atmospheric Emitted Radiance <span class="hlt">Interferometer</span> (AERI) Handbook</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Demirgian, J; Dedecker, R</p> <p>2005-01-01</p> <p>The atmospheric emitted radiance <span class="hlt">interferometer</span> (AERI) measures the absolute infrared (IR) spectral radiance (watts per square meter per steradian per wavenumber) of the sky directly above the instrument. The spectral measurement range of the instrument is 3300 to 520 wavenumbers (cm-1) or 3-19.2 microns for the normal-range instruments and 3300 to 400 cm-1 or 3-25 microns, for the extended-range polar instruments. Spectral resolution is 1.0 cm-1. Instrument field-of-view is 1.3 degrees. A calibrated sky radiance spectrum is produced every 8 minutes in normal mode and every minute in rapid sampling mode. The actual sample scan time is 20-30 sec in rapid sampling mode with periodic gaps when the instrument is looking at the blackbodies. Rapid sampling will become available in all AERIs. Rapid sampling time will eventually be reduced to data every 20 seconds. The AERI data can be used for 1) evaluating line-by-line radiative transport codes, 2) detecting/quantifying cloud effects on ground-based measurements of infrared spectral radiance (and hence is valuable for cloud property retrievals), and 3) calculating vertical atmospheric profiles of temperature and water vapor and the detection of trace gases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1992ESASP.354..247L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1992ESASP.354..247L"><span id="translatedtitle"><span class="hlt">Interferometer</span> concepts for astrometry in space</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Labeyrie, Antoine</p> <p>1992-12-01</p> <p>The concepts of several <span class="hlt">interferometers</span>, which can be built inside a tubular truss and be used according to the principle of the Hipparcos satellite, are described. Measuring the apparent angular spacing of star pairs, as required for wide angle astrometry, has been achieved by either pointing the stars sequentially or observing pairs of them simultaneously. The first method requires accurate divided circles on the instrument's mount, a stable pier carrying the instrument, and a good knowledge of the pier's diurnal rotation. The second method requires an internal prism or roof mirror system with fixed and known angle. An advantage in this case is that the instrument's pointing direction does not have to be accurately known. There is no need for a stable pier with known diurnal rotation. The Hipparcos satellite gave a successful illustration of the second method. The principle of the Hipparcos satellite, namely the measurement of angular distances between pairs of stars seen in different directions, has proved suitable for determining stellar positions with excellent accuracies. The extension of this principle to deployable space frames carrying optical elements which can observe simultaneously in a number of directions is also considered.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20050243457','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20050243457"><span id="translatedtitle">A Quasioptical Vector <span class="hlt">Interferometer</span> for Polarization Control</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Chuss, David T.; Wollack, Edward J.; Moseley, Harvey S.; Novak, Giles</p> <p>2005-01-01</p> <p>We present a mathematical description of a Quasioptical Vector <span class="hlt">Interferometer</span> (QVI), a device that maps an input polarization state to an output polarization state by introducing a phase delay between two linear orthogonal components of the input polarization. The advantages of such a device over a spinning wave-plate modulator for measuring astronomical polarization in the far-infrared through millimeter are: 1. The use of small, linear motions eliminates the need for cryogenic rotational bearings, 2. The phase flexibility allows measurement of Stokes V as well as Q and U, and 3. The QVI allows for both multi-wavelength and broadband modulation. We suggest two implementations of this device as an astronomical polarization modulator. The first involves two such modulators placed in series. By adjusting the two phase delays, it is possible to use such a modulator to measure Stokes Q, U, and V for passbands that are not too large. Conversely, a single QVI may be used to measure Q and V independent of frequency. In this implementation, Stokes U must be measured by rotating the instrument. We conclude this paper by presenting initial laboratory results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2000eso..pres...14.','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2000eso..pres...14."><span id="translatedtitle">With the VLT <span class="hlt">Interferometer</span> towards Sharper Vision</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p></p> <p>2000-05-01</p> <p>The Nova-ESO VLTI Expertise Centre Opens in Leiden (The Netherlands) European science and technology will gain further strength when the new, front-line Nova-ESO VLTI Expertise Centre (NEVEC) opens in Leiden (The Netherlands) this week. It is a joint venture of the Netherlands Research School for Astronomy (NOVA) (itself a collaboration between the Universities of Amsterdam, Groningen, Leiden, and Utrecht) and the European Southern Observatory (ESO). It is concerned with the Very Large Telescope <span class="hlt">Interferometer</span> (VLTI). The Inauguration of the new Centre will take place on Friday, May 26, 2000, at the Gorlaeus Laboratory (Lecture Hall no. 1), Einsteinweg 55 2333 CC Leiden; the programme is available on the web. Media representatives who would like to participate in this event and who want further details should contact the Nova Information Centre (e-mail: jacques@astro.uva.nl; Tel: +31-20-5257480 or +31-6-246 525 46). The inaugural ceremony is preceded by a scientific workshop on ground and space-based optical interferometry. NEVEC: A Technology Centre of Excellence As a joint project of NOVA and ESO, NEVEC will develop in the coming years the expertise to exploit the unique interferometric possibilities of the Very Large Telescope (VLT) - now being built on Paranal mountain in Chile. Its primary goals are the * development of instrument modeling, data reduction and calibration techniques for the VLTI; * accumulation of expertise relevant for second-generation VLTI instruments; and * education in the use of the VLTI and related matters. NEVEC will develop optical equipment, simulations and software to enable interferometry with VLT [1]. The new Center provides a strong impulse to Dutch participation in the VLTI. With direct involvement in this R&D work, the scientists at NOVA will be in the front row to do observations with this unique research facility, bound to produce top-level research and many exciting new discoveries. The ESO VLTI at Paranal ESO PR Photo 14a/00 ESO PR Photo 14a/00 [Preview - JPEG: 359 x 400 pix - 120k] [Normal - JPEG: 717 x 800 pix - 416k] [High-Res - JPEG: 2689 x 3000 pix - 6.7M] Caption : A view of the Paranal platform with the four 8.2-m VLT Unit Telescopes (UTs) and the foundations for the 1.8-m VLT Auxiliary Telescopes (ATs) that together will be used as the VLT <span class="hlt">Interferometer</span> (VLTI). The three ATs will move on rails (yet to be installed) between the thirty observing stations above the holes that provide access to the underlying tunnel system. The light beams from the individual telescopes will be guided towards the centrally located, partly underground Interferometry Laboratory in which the VLTI instruments will be set up. This photo was obtained in December 1999 at which time some construction materials were still present on the platform; they were electronically removed in this reproduction. The ESO VLT facility at Paranal (Chile) consists of four Unit Telescopes with 8.2-m mirrors and several 1.8-m auxiliary telescopes that move on rails, cf. PR Photo 14a/00 . While each of the large telescopes can be used individually for astronomical observations, a prime feature of the VLT is the possibility to combine all of these telescopes into the Very Large Telescope <span class="hlt">Interferometer</span> (VLTI) . In the interferometric mode, the light beams from the VLT telescopes are brought together at a common focal point in the Interferometry Laboratory that is placed at the centre of the observing platform on top of Paranal. In principle, this can be done in such a way that the resulting (reconstructed) image appears to come from a virtual telescope with a diameter that is equal to the largest distance between two of the individual telescopes, i.e., up to about 200 metres. The theoretically achievable image sharpness of an astronomical telescope is proportional to its diameter (or, for an <span class="hlt">interferometer</span>, the largest distance between two of its component telescopes). The interferometric observing technique will thus allow the VLTI to produce images as sharp as 0.001 arcsec (at wavelength 1 µm) - this corresponds t</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/15006737','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/15006737"><span id="translatedtitle">SATURATION OF A HIGH GRAIN <span class="hlt">SINGLE-PASS</span> FEL.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>KRINSKY, S.</p> <p>2004-01-07</p> <p>We study a perturbation expansion for the solution of the nonlinear one-dimensional FEL equations. We show that in the case of a monochromatic wave, the radiated intensity satisfies a scaling relation that implies, for large distance z traveled along the undulator, a change in initial value of the radiation field corresponds to a translation in z (lethargy). Analytic continuation using Pade approximates yields accurate results for the radiation field early in saturation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ifi.uzh.ch/vmml/publications/older-puclications/SinglePassMultiViewVolumeRendering.pdf','EPRINT'); return false;" href="http://www.ifi.uzh.ch/vmml/publications/older-puclications/SinglePassMultiViewVolumeRendering.pdf"><span id="translatedtitle"><span class="hlt">SINGLE-PASS</span> MULTI-VIEW VOLUME RENDERING Thomas Hbner</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Pajarola, Renato B.</p> <p></p> <p>in a single rendering pass, including sub-pixel wavelength selective views for high-quality auto development of graphics hardware and in particular the integration of highly programmable GPUs made in the field. In multi-view display systems, the rendering time is the limiting factor, as, compared to single</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.osti.gov/scitech/servlets/purl/1024628','SCIGOV-STC'); return false;" href="http://www.osti.gov/scitech/servlets/purl/1024628"><span id="translatedtitle">A Study of <span class="hlt">Single</span> <span class="hlt">Pass</span> Ion Effects at the ALS</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Byrd, J.M.; Thomson, J.; Chao, A.W.; Heifets, S.; Minty, M.G.; Seeman, J.T.; Stupakov, G.V.; Zimmermann, F.; Raubenheimer, T.O.; /CERN</p> <p>2011-09-13</p> <p>We report the results of experiments on a 'fast beam-ion instability' at the Advanced Light Source (ALS). This ion instability, which can arise even when the ions are not trapped over multiple beam passages, will likely be important for many future accelerators. In our experiments, we filled the ALS storage ring with helium gas, raising the pressure approximately two orders of magnitude above the nominal pressure. With gaps in the bunch train large enough to avoid conventional (multi-turn) ion trapping, we observed a factor of 2-3 increase in the vertical beam size along with coherent beam oscillations which increased along the bunch train. Ion trapping has long been recognized as a potential limitation in electron storage rings. The ions, generated by beam-gas collisions, become trapped in the negative potential of the beam and accumulate over multiple beam passages. The trapped ions are then observed to cause a number of deleterious effects such as an increasing beam phase space, a broadening and shifting of the beam transverse oscillation frequencies (tunes), collective beam instabilities, and beam lifetime reductions. All of these effects are of concern for the next generation of accelerators, such as the B-factories or damping rings for future linear colliders, which will store high beam currents with closely spaced bunches and ultra-low beam emittances. One of the standard solutions used to prevent ion trapping is to include a gap in the bunch train which is long compared to the bunch spacing. In this case, the ions are first strongly-focused by the passing electron bunches and then over-focused in the gap. With a sufficiently large gap, the ions can be driven to large amplitudes where they form a diffuse halo and do not affect the beam. In this paper, we describe experiments that study a new regime of transient ion instabilities predicted to arise in future electron storage rings, and linacs with bunch trains. These future rings and linacs, which will be operated with higher beam currents, small transverse beam emittances, and long bunch trains, will use ion clearing gaps to prevent conventional ion trapping. But, while the ion clearing gap may suppress the conventional ion instabilities, it will not suppress a transient beam-ion instability where ions generated and trapped during the passage of a single train lead to a fast instability. While both conventional and transient ion instabilities have the same origin, namely ions produced by the beam, they have different manifestations and, more importantly, the new transient instability can arise even after the conventional ion instability is cured. This new instability is called the 'Fast Beam-Ion Instability' (FBII). In many future rings, the FBII is predicted to have very fast growth rates, much faster than the damping rates of existing and proposed transverse feedback systems, and thus is a potential limitation. To study the FBII, we performed experiments at the ALS, a 1.5 GeV electron storage ring. At the nominal ALS pressure of about 0.24 nTorr, the FBII is not evident. To study the instability, we intentionally added helium gas to the storage-ring vacuum system until the residual gas pressure was increased about 80 nTorr. This brought the predicted growth rate of the instability at least an order of magnitude above the growth rate of conventional multibunch instabilities driven by the RF cavities and above the damping rate of the transverse feedback system (TFB) in the ALS and, thereby, established conditions very similar to those in a future storage ring. We then filled the ring with a relatively short train of bunches, suppressing conventional ion instabilities. In the following, we will first briefly describe This paper describes the experiment and results in more detail.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19900017242','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19900017242"><span id="translatedtitle"><span class="hlt">Single-pass</span> memory system evaluation for multiprogramming workloads</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Conte, Thomas M.; Hwu, Wen-Mei W.</p> <p>1990-01-01</p> <p>Modern memory systems are composed of levels of cache memories, a virtual memory system, and a backing store. Varying more than a few design parameters and measuring the performance of such systems has traditionally be constrained by the high cost of simulation. Models of cache performance recently introduced reduce the cost simulation but at the expense of accuracy of performance prediction. Stack-based methods predict performance accurately using one pass over the trace for all cache sizes, but these techniques have been limited to fully-associative organizations. This paper presents a stack-based method of evaluating the performance of cache memories using a recurrence/conflict model for the miss ratio. Unlike previous work, the performance of realistic cache designs, such as direct-mapped caches, are predicted by the method. The method also includes a new approach to the problem of the effects of multiprogramming. This new technique separates the characteristics of the individual program from that of the workload. The recurrence/conflict method is shown to be practical, general, and powerful by comparing its performance to that of a popular traditional cache simulator. The authors expect that the availability of such a tool will have a large impact on future architectural studies of memory systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014DPS....4621425F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014DPS....4621425F"><span id="translatedtitle">Planetary <span class="hlt">Radar</span> with the Green Bank Telescope</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ford, Alyson; Ford, John M.; Watts, Galen</p> <p>2014-11-01</p> <p>The large aperture and sensitive receivers of the National Radio Astronomy Observatory's Robert C. Byrd Green Bank Telescope (GBT) make it an attractive receiving station for bistatic <span class="hlt">radar</span> experiments. Consequently, it has been used as a receive station for <span class="hlt">radar</span> observations since its commissioning in 2001. The GBT is equipped with receivers for all common planetary <span class="hlt">radar</span> transmitters at P, S, and X band, as well as for future <span class="hlt">radars</span> at up to 86 GHz. We describe the technical capabilities of the GBT and its instrumentation in terms of its tracking and RF performance, the available <span class="hlt">radar</span> backends, and select science results obtained through the use of the GBT.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19920024979','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19920024979"><span id="translatedtitle">Research relative to weather <span class="hlt">radar</span> measurement techniques</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Smith, Paul L.</p> <p>1992-01-01</p> <p>Research relative to weather <span class="hlt">radar</span> measurement techniques, which involves some investigations related to measurement techniques applicable to meteorological <span class="hlt">radar</span> systems in Thailand, is reported. A major part of the activity was devoted to instruction and discussion with Thai <span class="hlt">radar</span> engineers, technicians, and meteorologists concerning the basic principles of <span class="hlt">radar</span> meteorology and applications to specific problems, including measurement of rainfall and detection of wind shear/microburst hazards. Weather <span class="hlt">radar</span> calibration techniques were also considered during this project. Most of the activity took place during two visits to Thailand, in December 1990 and February 1992.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19830021218','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19830021218"><span id="translatedtitle">Stereo side-looking <span class="hlt">radar</span> experiments</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Leberl, F.; Raggam, J.; Kobrick, M.</p> <p>1980-01-01</p> <p>The application of side-looking <span class="hlt">radar</span> images in geoscience fields can be enhanced when using overlapping image strips that are viewed in stereo. A question concerns the quality of stereo <span class="hlt">radar</span>. This quality is described evaluating stereo viewability and using the concept of vertical exaggeration with sets of actual <span class="hlt">radar</span> images. A conclusion is that currently available stereo <span class="hlt">radar</span> data are not optimized, that therefore a better quality can be achieved if data acquisition is appropriately arranged, and that the actual limitations of stereo <span class="hlt">radar</span> are still unexplored.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19930064036&hterms=grass&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dgrass','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19930064036&hterms=grass&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dgrass"><span id="translatedtitle">L-band <span class="hlt">radar</span> scattering from grass</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Chauhan, N.; O'Neill, P.; Le Vine, D.; Lang, R.; Khadr, N.</p> <p>1992-01-01</p> <p>A <span class="hlt">radar</span> system based on a network analyzer has been developed to study the backscatter from vegetation. The <span class="hlt">radar</span> is operated at L-band. <span class="hlt">Radar</span> measurements of a grass field were made in 1991. The <span class="hlt">radar</span> returns from the grass were measured at three incidence angles. Ground truth and canopy parameters such as blade and stem dimensions, moisture content of the grass and the soil, and blade and stem density, were measured. These parameters are used in a distorted Born approximation model to compute the backscatter coefficients from the grass layer. The model results are compared with the <span class="hlt">radar</span> data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19790043164&hterms=sars&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dsars','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19790043164&hterms=sars&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dsars"><span id="translatedtitle">Future of synthetic aperture <span class="hlt">radar</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Barath, F. T.</p> <p>1978-01-01</p> <p>The present status of the applications of Synthetic Aperture <span class="hlt">Radars</span> (SARs) is reviewed, and the technology state-of-the art as represented by the Seasat-A and SIR-A SARs examined. The potential of SAR applications, and the near- and longer-term technology trends are assessed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=19830000276&hterms=gpr&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dgpr','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=19830000276&hterms=gpr&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Dgpr"><span id="translatedtitle"><span class="hlt">Radar</span> Cuts Subsoil Survey Costs</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Johnson, R.; Glaccum, R.</p> <p>1984-01-01</p> <p>Soil features located with minimum time and labor. Ground-penetrating <span class="hlt">radar</span> (GPR) system supplements manual and mechanical methods in performing subsurface soil survey. Mobile system obtains graphic profile of soil discontinuities and interfaces as function of depth. One or two test borings necessary to substantiate soil profile. GPR proves useful as reconnaissance tool.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://pubs.er.usgs.gov/publication/70012280','USGSPUBS'); return false;" href="http://pubs.er.usgs.gov/publication/70012280"><span id="translatedtitle">Pioneer Venus <span class="hlt">radar</span> mapper experiment</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Pettengill, G.H.; Ford, P.G.; Brown, W.E.; Kaula, W.M.; Keller, C.H.; Masursky, H.; McGill, G.E.</p> <p>1979-01-01</p> <p>Altimetry and <span class="hlt">radar</span> scattering data for Venus, obtained from 10 of the first 13 orbits of the Pioneer Venus orbiter, have disclosed what appears to be a rift valley having vertical relief of up to 7 kilometers, as well as a neighboring, gently rolling plain. Planetary oblateness appears unlikely to exceed 112500 and may be substantially smaller. Copyright ?? 1979 AAAS.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=20150007761&hterms=radar&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dradar','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=20150007761&hterms=radar&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dradar"><span id="translatedtitle">SMAP <span class="hlt">Radar</span> Processing and Calibration</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>West, R.; Jaruwatanadilok, S.; Kwoun, O.; Chaubell, M.</p> <p>2013-01-01</p> <p>The Soil Moisture Active Passive (SMAP) mission is part of the NASA space-based Earth observation program, and consists of an L-band <span class="hlt">radar</span> and radiometer scheduled for launch into sun synchronous orbit in late 2014. A joint effort of the Jet Propulsion Laboratory (JPL) and the Goddard Space Flight Center (GSFC), the SMAP mission draws heavily on the design and risk reduction heritage of the Hydrosphere State (Hydros) mission [1], [2]. The SMAP science and applications objectives are to: 1) understand processes that link the terrestrial water, energy and carbon cycles, 2) estimate global water and energy fluxes at the land surface, 3) quantify net carbon flux in boreal landscapes, 4) enhance weather and climate forecast skill, and 5) develop improved flood prediction and drought monitoring capability. To meet these science objectives, SMAP ground processing will combine the attributes of the <span class="hlt">radar</span> and radiometer observations (in terms of their spatial resolution and sensitivity to soil moisture, surface roughness, and vegetation) to estimate soil moisture with 4% volumetric accuracy at a resolution of 10 km, and freeze-thaw state at a resolution of 1-3 km. Model sensitivities translate the soil moisture accuracy to a <span class="hlt">radar</span> backscatter accuracy of 1 dB (1 sigma) at 3 km resolution and a brightness temperature accuracy of 1.3 K at 40 km resolution. This paper will describe the level 1 <span class="hlt">radar</span> processing and calibration challenges and the choices made so far for the algorithms and software implementation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://ntrs.nasa.gov/search.jsp?R=PIA00499&hterms=charles+darwin&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dcharles%2Bdarwin','NASA-TRS'); return false;" href="http://ntrs.nasa.gov/search.jsp?R=PIA00499&hterms=charles+darwin&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dcharles%2Bdarwin"><span id="translatedtitle"><span class="hlt">Radar</span> Image of Galapagos Island</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1994-01-01</p> <p><p/>This is an image showing part of Isla Isabella in the western Galapagos Islands. It was taken by the L-band <span class="hlt">radar</span> in HH polarization from the Spaceborne Imaging <span class="hlt">Radar</span> C/X-Band Synthetic Aperture <span class="hlt">Radar</span> on the 40th orbit of the space shuttle Endeavour. The image is centered at about 0.5 degree south latitude and 91 degrees west longitude and covers an area of 75 by 60 kilometers (47 by 37 miles). The <span class="hlt">radar</span> incidence angle at the center of the image is about 20 degrees.<p/>The western Galapagos Islands, which lie about 1,200 kilometers (750 miles) west of Ecuador in the eastern Pacific, have six active volcanoes similar to the volcanoes found in Hawaii. Since the time of Charles Darwin's visit to the area in 1835, there have been over 60 recorded eruptions of these volcanoes. This SIR-C/X-SAR image of Alcedo and Sierra Negra volcanoes shows the rougher lava flows as bright features, while ash deposits and smooth pahoehoe lava flows appear dark. A small portion of Isla Fernandina is visible in the extreme upper left corner of the image.<p/>The Galapagos Islands are one of the SIR-C/X-SAR supersites and data of this area will be taken several times during the flight to allow scientists to conduct topographic change studies and to search for different lava flow types, ash deposits and fault lines.<p/>Spaceborne Imaging <span class="hlt">Radar</span>-C and X-Synthetic Aperture <span class="hlt">Radar</span> (SIR-C/X-SAR) is part of NASA's Mission to Planet Earth. The <span class="hlt">radars</span> illuminate Earth with microwaves allowing detailed observations at any time, regardless of weather or sunlight conditions. SIR-C/X-SAR uses three microwave wavelengths: L-band (24 cm), C-band (6 cm) and X-band (3 cm). The multi-frequency data will be used by the international scientific community to better understand the global environment and how it is changing. The SIR-C/X-SAR data, complemented by aircraft and ground studies, will give scientists clearer insights into those environmental changes which are caused by nature and those changes which are induced by human activity. SIR-C was developed by NASA's Jet Propulsion Laboratory. X-SAR was developed by the Dornier and Alenia Spazio companies for the German space agency, Deutsche Agentur fuer Raumfahrtangelegenheiten (DARA), and the Italian space agency, Agenzia Spaziale Italiana (ASI).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013EGUGA..1512450C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013EGUGA..1512450C"><span id="translatedtitle">Monitoring by holographic <span class="hlt">radar</span> systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Catapano, Ilaria; Crocco, Lorenzo; Affinito, Antonio; Gennarelli, Gianluca; Soldovieri, Francesco</p> <p>2013-04-01</p> <p>Nowadays, <span class="hlt">radar</span> technology represents a significant opportunity to collect useful information for the monitoring and conservation of critical infrastructures. <span class="hlt">Radar</span> systems exploit the non-invasive interaction between the matter and the electromagnetic waves at microwave frequencies. Such an interaction allows obtaining images of the region under test from which one can infer the presence of potential anomalies such as deformations, cracks, water infiltrations, etc. This information turns out to be of primary importance in practical scenarios where the probed structure is in a poor state of preservation and renovation works must be planned. In this framework, the aim of this contribution is to describe the potentialities of the holographic <span class="hlt">radar</span> Rascan 4/4000, a holographic <span class="hlt">radar</span> developed by Remote Sensing Laboratory of Bauman Moscow State Technical University, as a non-destructive diagnostic tool capable to provide, in real-time, high resolution subsurface images of the sounded structure [1]. This <span class="hlt">radar</span> provides holograms of hidden anomalies from the amplitude of the interference signal arising between the backscattered signal and a reference signal. The performance of the holographic <span class="hlt">radar</span> is appraised by means of several experiments. Preliminary tests concerning the imaging below the floor and inside wood structures are carried out in controlled conditions at the Electromagnetic Diagnostic Laboratory of IREA-CNR. After, with reference to bridge monitoring for security aim, the results of a measurement campaign performed on the Musmeci bridge are presented [2]. Acknowledgments This research has been performed in the framework of the "Active and Passive Microwaves for Security and Subsurface imaging (AMISS)" EU 7th Framework Marie Curie Actions IRSES project (PIRSES-GA-2010-269157). REFERENCES [1] S. Ivashov, V. Razevig, I. Vasilyev, A. Zhuravlev, T. Bechtel, L. Capineri, The holographic principle in subsurface <span class="hlt">radar</span> technology, International Symposium to Commemorate the 60th Anniversary of the Invention of Holography, Springfield, Massachusetts USA, October 27-29, pp. 183-197, 2008. [2] I. Catapano, L. Crocco, A. F. Morabito, F. Soldovieri, "Tomographic imaging of holographic GPR data for non-invasive structural assessment: the Musmeci bridge investigation", Nondestructive testing and evaluation, vol. 27, pp. 229-237, 2012.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_25 --> <center> <div class="footer-extlink text-muted"><small>Some links on this page may take you to non-federal websites. 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