Absolute Flux Density Calibrations: Receiver Saturation Effects ... positive or negative measurement errors, with polarity depending upon operating ...
NASA Website
Absolutely calibrated ultraviolet stellar spectra from 3100 A to the hydrogen absorption edge at 912
NASA Technical Reports Server (NTRS)
... Accession Number : AD0700159. Title : CALIBRATION OF RADIOMETERS IN ABSOLUTE RADIATION UNITS,. Corporate ...
DTIC Science & Technology
... Accession Number : AD0667289. Title : ABSOLUTE CALIBRATION OF REFERENCE HYDROPHONES IN THE AUDIO FREQUENCY RANGE,. ...
The techniques necessary to perform an absolute calibration of the airborne SAR-580 system are described. The calibration method eliminates the effects of all the system components, including the image processor and the method of power measurement from an image. It involves the use of both an internal ...
NASA Astrophysics Data System (ADS)
The status of pyranometer and pyrheliometer calibration techniques was reviewed. The intercomparison of absolute cavity pyrheliometers is discussed. A round robin experiment performed to isolate various aspects of calibration methods suggests that a much more rigorous approach is required for calibrations of ...
Energy Citations Database
An unbaked calibration system is described that permits absolute calibration with a piston manometer
The effects of variations in ambient air on absolute measurements of roentgens by cavity ionization chambers are examined. (J.R.D.)
Contents: Characterization of Falling Weight Deflectometer Deflection Basin; Calculating Pavement Deflections with Velocity Transducers; Development of an Absolute Calibration System for Nondestructive Testing Devices; Effect of Various Load Distributions...
National Technical Information Service (NTIS)
The U-B, B-V diagram within F0 - G2 spectral classes is calibrated in spectral classes, absolute magnitudes, effective temperatures, and gravities for solar chemical composition stars. The calibration is based on the mean intrinsic color indices and the mean physical parameters for stars of different MK types.
A description is given of the experimental methods used in the calibration procedure, taking into account the source of radiant energy, the monochromator, the absolute standard detector, and the transfer standards. The experimental apparatus is discussed. A graph showing the effect of beam motion on the detected signal is presented and ...
Absolute calibration of the Pierre Auger Observatory fluorescence detectors uses a light source at the telescope aperture. The technique accounts for the combined effects of all detector components in a single measurement. The calibrated 2.5 m diameter light source fills the aperture, providing uniform illumination ...
DOE Information Bridge
Of course, this does not necessarily mean that the absolute calibration of the LECS is perfect but such an excercise will add more data points to the ...
The TM multispectral scanner system was calibrated in an absolute manner before launch. To determine
... Abstract : NEW ELECTRICALLY CALIBRATED ABSOLUTE RADIOMETERS (ESRS) WERE DEVELOPED HAVING FAST RESPONSE AND HIGH ...
... Title : ABSOLUTE CALIBRATION OF AURORAL PHOTOMETERS AND GROUND-BASED MEASUREMENTS IN THE 3200-7500-ANGSTROMS ...
Requirement, Goal. XRT, absolute effective area (2-10 keV in XIS), 5%, 5%. XRT, XRS to XIS area cross-calibration, 1%, 1%. XRT, vignetting, 2% over XIS fov ...
Absolute calibration of the Pierre Auger Observatory fluorescence detectors uses a 375 nm light source at the telescope aperture. This end-to-end technique accounts for the combined effects of all detector components in a single measurement. The relative response has been measured at wavelengths of 320, 337, 355, 380 and 405 nm, ...
... for Absolute Measurements at the ... of a Lyman-alpha photometer on ... MAGNETOSPHERE, ULTRAVIOLET RADIATION), SCIENTIFIC SATELLITES ...
The subject of this work concerns with the measurement of absolute calibration factors for the use of CR-39 as an absolute detector in indoor daughters monitoring. Up to now the usefulness of calibration factors was restricted to environmental conditions ...
A number of high-priority programs will benefit from a near-infrared absolute calibration at the 1% level. This requirement has been emphasized by the Dark Energy Task Force and in Astro2010 with regard to reducing systematic errors in dark energy studies. It also will improve our understanding of stellar effective temperatures (and ...
We review the current status of the flux calibration of the Cosmic Origins Spectrograph (COS). The absolute flux calibration is ultimately tied to model atmosphere calculations for well studied DA white dwarf standards, but in practice a number of other effects have to be taken into account to properly ...
Confidence-accuracy (CA) calibration was examined for absolute and relative face recognition judgments as well as for recognition judgments from groups of stimuli presented simultaneously or sequentially (i.e., simultaneous or sequential mini-lineups). When the effect of difficulty was controlled, absolute and ...
ERIC Educational Resources Information Center
PubMed
The Gaia spectro-photometric data consist of white-light G magnitudes from unfiltered fluxes measured in the astrometric field CCDs, and low resolution prism spectra measured in the blue (BP) and red (RP) CCDs. The integrated flux of these BP and RP spectra will yield GBP and GRP magnitudes as two broad passbands. The internal flux calibration will correct for all possible ...
The paper describes the development of an absolute calibration standard for irradiance measurements.
Light source having absolute spectral energy distribution for standardizing star tracker calibration
in the absolute energy scale. Another possible systematic error, a non-Gaussian tail to the energy resolution fluctuation and a large error in the energy calibration, will be tested by future measurements with Super, we simulate the effect of an absolute energy calibration error on the shape ...
E-print Network
The DIII-D Thomson system measures electron density and temperature with eight pulsed ND:YAG lasers along three paths through the plasma vessel. The components of the Thomson system are absolutely calibrated so the measurements can be combined into a single profile from a normalized plasma radius ({rho}) of about 0.1 to the edge of the plasma. A ...
G.1 Files for Calibrating Absolute Photon Flux ... Table G.1 contains the names of these calibration files with a short comment of their contents. ...
Absolute GNSS Antenna Calibration with a Robot: Repeatability of Phase Variations,. Calibration of GLONASS and. Determination of Carrier-to-Noise Pattern ...
A method for absolute calibration of proportional counters for pulsed fast neutrons is presented. The method is based on the use of an isotopic standard source and development of a model for counting detected events from area of a signal compounded by single piled up neutron pulses. Effects of detection counting statistics and ...
Prompted by the need for various studies ranging from quantum information to foundations of quantum mechanics, we systematically study the possibility of the absolute calibration of analog photodetectors based on the properties of parametric amplifiers. Our results show that such a method can be effectively developed with interesting ...
We report on new charge calibrations and linearity tests with high-dynamic range for eight different scintillating screens typically used for the detection of relativistic electrons from laser-plasma based acceleration schemes. The absolute charge calibration was done with picosecond electron bunches at the ELBE linear accelerator in ...
This paper reviews the problem of absolute photometric calibration in the extreme uv range with particular reference to a solar satellite instrument. EUV transfer standards, the use of predispersing spectrometers, and polarization effects at near normal incidence are discussed. Changes in preflight calibration ...
A convenient laboratory calibration method is outlined. Uncertainties introduced by instrumental and atmospheric effects are discussed. The conclusion is that laboratory calibration is to be preferred. The variable atmospheric extinction can introduce great errors in ground-based measurements, and therefore necessitates separate ...
In the 1960s and 1970s optical region spectrophotometry achieved the status of a major tool in stellar research. New instrumentation, rotating grating scanners using photomultiplier tubes as detectors, and improved absolute calibrations of Vega made this possible. After this period the use of this technique declined to its near demise at present. The use ...
In the 1960's and 1970's optical region spectrophotometry achieved the status of a major tool in stellar research. New instrumentation, rotating grating scanners using photomultiplier tubes as detectors, and improved absolute calibrations of Vega made this possible. After this period the use of this technique declined to its near demise at present. The ...
... Title : REMOTE AEROSOL SENSING WITH AN ABSOLUTE CALIBRATED DOUBLE FREQUENCY LIDAR, IN: AGARD-CP-183, PAPER 4. ...
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) plans to observe climate change
... STABILITY AND ERROR ANALYSIS ... 4. TITLE AND SUBTITLE Stability and Error Analysis for Absolutely Calibrated Geodetic GPS Receivers 5a. ...
... Title : Absolutely Calibrated Vacuum Ultraviolet Spectra in the 150 nm to 250 nm Range from Plasmas Generated by the NIKE KrF Laser. ...
An absolute calibration technique for a spontaneously fissioning nuclide (which involves no arbitrary parameters) allows unique determination of the detector efficiency for that nuclide, hence of the fission source strength.
Page 1. AFRL-VS-HA-TR-2004-1109 Absolute Infrared Calibration of Standard Stars by the Midcourse Space Experiment SD Price C. Paxson ...
... Accession Number : ADA074711. Title : Absolute Calibration of a Uranium - 238 Fast-Neutron Detector. Descriptive Note : Technical note,. ...
... Accession Number : ADA483536. Title : Absolute Calibration of Time Receivers with DLR's GPS/Galileo HW Simulator. Descriptive ...
Methods have been demonstrated in operating nuclear plants for the in situ calibration of resistance thermometers with agreement between measured noise temperatures and dc calibration temperatures well within these required by the plant. A comparison of the results of Johnson noise power testing results and uncertainties, the requirements for accuracy, and ...
A low-pressure hydrogen discharge lamp was calibrated for radiant intensity in the vacuum ultraviolet spectral region on an absolute basis and was employed as a laboratory standard source in spectrograph calibrations. This calibration was accomplished thr...
In order to reference the speed and direction of ocean currents, currentmeters are fitted with a magnetic compass. The manufacturers of currentmeters provide users so-called autocalibration procedures and software to allow for the verification of the good working order and rectification of the bias of compass magnetic field sensors. Nevertheless, these tests do not make it possible to correct all ...
IRAS Explanatory Supplement VI. Flux Reconstruction and Calibration C. Absolute Calibration C.1 General Philosophy ...
the verification of the antenna beam alignment of all frequencies and polarizations,. the determination of the absolute calibration factor from the image ...
This activity uses the CHRONOS website to determine the absolute age of a portion of the geological time scale through the construction and use of a calibration curve
NSDL National Science Digital Library
Sensor calibrations using NBS standard of spectral irradiance, as used for Mariner IV CANOPUS sensor
The Very Small Array (VSA) is a synthesis telescope designed to image faint structures in the cosmic microwave background on degree and sub-degree angular scales. We have tested the operation of the VSA with a variety of blank-field and calibrator observations and cross-checked its calibration scale against independent measurements. We find that systematic ...
The prelaunch calibration of AXAF encompasses many aspects of the telescope. In principle, all that is needed is the complete point response function. This is, however, a function of energy, off-axis angle of the source, and operating mode of the facility. No single measurement would yield the entire result. Also, any calibration made prior to launch will ...
We describe, illustrate, and quantify the performance achieved by the combination of CGS3 and UKIRT, with emphasis on the role already played by CGS3 in the field of spectrally continuous, absolute, infrared radiance calibration. The focus of the paper is on the reliability and reproducibility of the spectral shapes obtained by CGS3. We offer an ...
As a step toward absolute calibration of optical tweezers, a first-principles theory of trapping forces with no adjustable parameters, corrected for spherical aberration, is experimentally tested. Employing two very different setups, we find generally very good agreement for the transverse trap stiffness as a function of microsphere radius for a broad ...
Jul 21, 2011 ... MISR has challenging radiometric specifications of 3% absolute, and 1% band and camera-relative calibration. The radiometric calibration is ...
... SUBJECT TERMS Moon, surface 16. ... Calibration against the Moon I: A disk-resolved lunar model for absolute reflectance calibration ...
... Accession Number : ADA537860. Title : Calibration Against the Moon. I: A Disk-Resolved Lunar Model for Absolute Reflectance Calibration. ...
Physics-based exploitation of image data from Earth observing sensors requires knowledge of the accuracy, stability and repeatability of a sensor's radiometric response within its in-flight environment. Vicarious radiometric calibration techniques, using terrestrial targets, provide an effective approach to obtaining this knowledge by measuring system ...
Research aimed at improving the inflight absolute radiometric calibration of advanced land observing
ultraviolet spectrophotometers to an altitude of about 2 10 ..... the absolute calibration of the spectrophotometer. The interpretation in ...
In thermoelastic stress analysis (TSA) the temperature change induced in a solid material as a result of the thermoelastic effect is measured with an infrared detector. Common infrared detectors used in TSA have a nonlinear signal to temperature relation. If a measurement is calibrated with a calibration constant determined previously ...
Atmospheric long-wave radiation is one of the most promising parameters for observations of climate change that are greenhouse effect related. Long-wave irradiance is usually measured with pyrgeometers that consist of a flat thermopile and a hemispherical dome acting as a filter and protecting the absorbing receiver surface. Pyrgeometers are blackbody ...
Multispectral area CCD camera based on liquid crystal tunable filter (LCTF) is a new spectral imaging system, which could record image of one wavelength on the area CCD by utilizing electrically controlled birefringence of liquid-crystal and interference principle of polarized light. Because of the special working principle of LCTF and frame transfer area CCD, the existing radiometric ...
The selection of fossil data to use as calibration age priors in molecular divergence time estimates inherently links neontological methods with paleontological theory. However, few neontological studies have taken into account the possibility of a taphonomic bias in the fossil record when developing approaches to fossil calibration selection. The ...
A description is given work performed on a program to develop an electrically calibrated detector (also called absolute radiometer, absolute detector, and electrically calibrated radiometer) that could be used to realize, maintain, and transfer a scale of...
Extensive atmospheric showers observed in coincidence by an underwater neutrino telescope and a HELYCON (HEllenic LYceum Cosmic Observatories Network) floating scintillation array, offer an efficient calibration tool for the angular offset and the absolute position of a deep sea neutrino Cherenkov telescope. We report results of our studies concerning ...
NIST pressure calibration services with nitrogen are now based on two transfer standard piston gages for which the effective areas have been determined by calibration with the manometer developed at NIST for gas thermometry. Root-sum-squared three sigma u...
The consensus regarding the absolute calibrations of the spectra of alpha Lyr and subdwarfs provoked a revision of the calibration of the Geneva photometric system passbands. The alterations made to the earlier version by Rufener and Maeder (1971) are sma...
Close-geometry efficiency calibration has been performed for a 25.4 mm�25.4 mm cylindrical LaBr3(Ce) detector using calibrated point sources of 137Cs and 60Co placed on the top of the detector surface. The absolute total detection efficiency and the absolute photo-peak efficiency, obtained with 60Co, are ...
The Beam Characterization System (BCS) used at the Central Receiver Test Facility digitizes the output signal from a standard 525-line video camera to obtain raw data for measurements of solar heliostat images. A rapid data rate and relative availability of off-the-shelf equipment favor the use of a video camera system, but the problem of an accurate absolute radiometric ...
An absolute spectroradiometric scale has been developed based on an electrically calibrated absolute detector and silicon detector-interference filter combination. Using the recently adopted definition of the photometric base unit, the candela, the absolute spectroradiometric scale was used to realize a photometric ...
... Title : EFFECT OF THE FORM OF GRINDING AND THE ABSOLUTE DIMENSIONS OF PARTS ON THE CORROSION-FATIGUE STRENGTH OF ...
A thermal imager with a microbolometer focal plane array (FPA) detector which does not require cooling is a relatively new type of instrument. With increasing use of thermal imagers for absolute temperature measurements, there is also an increasing need for their calibration. Five thermal imagers from three manufacturers were evaluated to identify ...
A PBS/NOVA lesson (with optional accompanying video) for which students will build and calibrate a thermometer, demonstrate the concept of temperature, measure temperature, and learn the history of the invention of the thermometer and the idea of absolute zero.
