The proposed effort extends the micro-lidar technology to compact tunable transmitters suitable for measurements of H2O vapor by Differential Absorption ...
NASA Website
We describe a first generation mid-infrared transmitter with pulse to pulse frequency agility and both wide and narrow band capability. This transmitter was used to make multicomponent Differential Absorption LIDAR (DIAL) measurements in the field.
DOE Information Bridge
... Title : A Sodium Lidar Transmitter for Wind and Temperature Measurements at Arctic Lidar Observatory for Middle Atmosphere Research (ALOMAR ...
DTIC Science & Technology
The design of a double pulsed, injection seeded, 2-micrometer compact coherent Differential absorption Lidar (DIAL) transmitter for CO2 sensing is presented. This system is hardened for ground and airborne applications. The design architecture includes th...
National Technical Information Service (NTIS)
A solution of the lidar equation is given with the aim of determining the attenuation coefficient of
NASA Technical Reports Server (NTRS)
... Transmitter Demonstration: Injection Laser Technology ... Tunable Blue-Green LIDAR Transmitter Demonstration: Injection Laser Technology ...
Lidar, an acronym for light detection and ranging, represents a class of instruments that utilize lasers to send probe beams into the atmosphere or onto the surface of the Earth and detect the backscattered return in order to measure properties of the atmosphere or surface. The associated technology has matured to the point where two lidar facilities, ...
NASA Astrophysics Data System (ADS)
Many studies recently have investigated the active remote sensing of atmospheric greenhouse gases, such as CO2 and CH4, by means of differential absorption lidar systems. According to them, the accuracy of the laser wavelengths used is one of the most important issues of this technique in terms of conformance to the high measurement sensitivity ...
Sep 16, 2010 ... The all fiber version amplifier system can used as the OPO/OPA pumping laser for ASCENDS mission Lidar transmitter. ...
The LIDAR was designed in a bistatic scheme with a separate transmitter and two receiver channels. It consists of three assemblies: ...
ABSTRACT We report initial measurements of atmospheric CO2 column density using a pulsed airborne lidar operating at 1572 nm. It uses a lidar measurement technique being developed at NASA Goddard Space Flight Center as a candidate for the CO2 measurement in the Active Sensing of CO2 Emissions over Nights, Days and Seasons (ASCENDS) space mission. The ...
lidar measurements of nearby deciduous foliage. The two wavelength laser transmitter operates ... A land-surface lidar that uses spectral reflectance to ...
profiles obtained by differential absorption lidar (DIAL) analysis. ... Differential absorption lidars (DIAL) have been and continue to be widely used for the ...
The design and operation of a differential absorption lidar system capable of remotely measuring the
Three lidar systems are currently in development at University of Hohenheim. A water vapor lidar based on the differential absorption lidar (DIAL) technology working near 815 or 935 nm, a temperature and aerosol lidar employing the rotational Raman technique at 355 nm, and an aerosol ...
The WAter vapour Lidar Experiment in Space (WALES) mission aims at providing water vapour profiles with high accuracy and vertical resolution through the troposphere and the lower stratosphere on a global scale using an instrument based on Differential Absorption Lidar (DIAL) observation technique, and mounted on an Earth orbiting ...
A ground-based differential absorption lidar (DIAL) system is described which has been developed for
A differential absorption and scattering lidar that measures hydrogen chloride with a sensitivity of
A parametric analysis of the Shuttle-borne differential absorption lidar concept for the measurement
Reflectance, transmittance and absorptance of muscovite type mica as function of thickness measured,
This dissertation investigates the feasibility of a novel, low power miniature lidar intended to measure the vertical distribution of atmospheric water vapor on Mars. This instrument could provide valuable information crucial to understanding the past and present climate of Mars. The emphasis is to develop a compact, efficient, all-semiconductor laser ...
An error analysis of differential absorption lidar (DIAL) measurements of stratospheric ozone from a Space Shuttle is discussed. A transmitter system consisting of a KrF excimer laser pumping gas cells of H2 or D2 producing output wavelengths in the near ...
The ambient atmosphere between the laser transmitter and the target can affect CO{sub 2} differential absorption lidar (DIAL) measurement sensitivity through a number of different processes. In this work, we will address two of the sources of atmospheric interference with CO{sub 2} DIAL measurements: effects due to beam propagation ...
CO{sub 2} differential absorption lidar (DIAL) performance can be adversely affected by the ambient atmosphere between the laser transmitter and the target through a number of different processes. This work addresses two sources of atmospheric interference with multispectral CO{sub 2} DIAL measurements: effects due to beam propagation ...
Energy Citations Database
The lidar remote sensing techniques are powerful for monitoring of gaseous toxic species in atmosphere over wide areas. The paper presented describes design, development and field testing of Mobile Lidar System (MLS) based on utilization of Differential Absorption Lidar (DIAL) technique. The activity is performed ...
Current results from laboratory testing of an eye-safe, ground-based ozone lidar instrument specialized for ozone differential absorption lidar measurements in the troposphere are presented. This compact prototype instrument is intended to be a prototype for operation at remote field sites and to serve as the basic unit for future ...
A method to determine the alignment of the transmitter and receiver fields of view of a light detection and ranging (LIDAR) system. This method can be employed to determine the far-field intensity distribution of the transmitter beam, as well as the variations in transmitted laser beam pointing as a function of time, temperature, or ...
DOEpatents
The optical systems for the transmitter and reccivcr of a high-power lidar for ... The entire optical system for the new Ii(iar was redesigned, making ...
The lidar transmitter is based on a diode pumped, passively Q-switched, neodymium-doped yttrium garnet (Nd:YAG) laser. This configuration was chosen for its ...
... system. The rapidly-tunable Fabry-Perot interferometer (etalon) tracks the emission wavelength of the LIDAR transmitter. The ...
... Title : NONLINEAR RESONANT ABSORPTION EFFECTS ON THE DESIGN OF RESONANCE FLUORESCENCE LIDARS AND LASER GUIDE ...
A differential absorption lidar has been built to measure CO2 concentration in the atmosphere. The transmitter is a pulsed single-frequency Ho:Tm:YLF laser at a 2.05-microm wavelength. A coherent heterodyne receiver was used to achieve sensitive detection, with the additional capability for wind profiling by a Doppler technique. Signal ...
PubMed
Jul 27, 2010 ... discuss the development effort of the laser transmitters for the ICESat-2 mission. Keywords: LIDAR, Remote Sensing, Space Laser Systems, ...
Direct Detect Doppler wind lidar retrieves the three dimensional wind by discriminating the frequency shift of the atmosphere elastic backscatter signal. The wind measurement sensitivity of edge detect technology based on iodine absorption lines highly depends on the aerosol backscatter ratio indicating the mixing ratio of aerosol to atmosphere molecule in ...
The University of Wisconsin high spectral resolution lidar (HSRL) measures optical properties of the
A small compact ozone differential absorption lidar capable of being deployed on a small aircraft or
Development of advanced differential absorption lidar (DIAL) receivers is very important to increase
The theory of differential absorption lidar measurements for lines with a Voigt profile is given and
... Abstract : An experimental pulsed neodymium lidar system was modified and ... In addition, the transmitter and receiver beams were made coaxial to ...
Page 1. i Modeling Multiple Scattering and Absorption for a Differential Absorption LIDAR System by Daniel D. Blevins BS ...
Space Lidar applications benefits from efficient conductive cooled laser transmitters. Effective thermal management is a key challenge for high-energy laser development. In this paper, the design and performance of a totally conductive cooled 2�m laser is presented. Three heat pipes capable of removing 150 watts of heat both from the pump diode lasers ...
An algorithm that integrates a time-resolved lidar signature for use in estimating transmittance, extinction coefficient, mass concentration, and CL values generated under battlefield conditions is applied to lidar signatures measured during the DIRT-I te...
Optical transmittance of fused silica at elevated temperatures, showing shift in UV to IR ABSORPTION
Lidar monitoring of the gaseous molecules in atmosphere can be used for concentration measurements of the toxic pollutants in air of the urban and industrial regions. Such a concentration study in the multi-components gaseous mixture by lidar technique is a complex problem in atmospheric pollution monitoring. The differential ...
Atmospheric methane levels have remained relatively constant over the last decade around 1.78 parts per million (ppm) but observations since 2007 show that levels may be increasing. This trend may be caused by increased fossil fuel production, rice farming, livestock and landfills, but the underlying causes are quite uncertain. One hypothesis is that reservoirs of carbon trapped in the permafrost ...
2 micron solid-state lasers are the primary choice for coherent Doppler wind detection. As wind lidars, they are used for wake vortex and clear air turbulence detection providing air transport safety. In addition, 2 micron lasers are one of the candidates for CO2 detection lidars. The rich CO2 absorption line around 2 micron, combined ...
A differential absorption lidar (DIAL) using a Q-switched CO(2) laser and a heterodyne receiver has been developed. The DIAL system is highly automated with computer-controlled laser-line selection and signal processing. The transmitter operates at a pulse-repetition frequency of 20 kHz and has an average output power of 1.8 W. A ...
Measurement Description: The UV Differential Absorption Lidar (DIAL) system is used to measure aerosol, cloud, and ozone profiles above the aircraft [Browell ...
Airborne UV Differential Absorption Lidar (DIAL): Measuring Ozone and Aerosols in the Atmosphere. Figure 1: The Electromagnetic Spectrum The ozone hole ...
Sep 9, 2011 ... DIAL Ops. The NASA Langley airborne Differential Absorption Lidar (DIAL) uses ultraviolet (UV) DIAL wavelengths of 288 and 300 nm for the ...
Computer hardware and software of the NASA multipurpose differential absorption lidar (DIAL) sysatem
We report the progress in the development of a compact mid-infrared differential absorption lidar (DIAL) for ground-based and airborne monitoring of leaks in natural gas pipeline systems. This sensor, named Lidar II, weighs approximately 30 kg (70 lbs) and occupies a volume of 0.08 m3 (3.5 ft3). Lidar II can be ...
X-ray absorption edge observation by transmittance measurements through thin unbacked metal films in
The measurement of the transmittance of filters used in a rocketborne ozonesonde and the calculation of effective ozone absorption coefficients from the transmittance data are described. (Author)
Mobile differential absorption lidar (DIAL) systems have been used for the last two decades. The lidar group in Lund has performed many DIAL measurements with a mobile lidar system which was first described in 1987. This report describes how that system w...
The GSFC pressure-temperature lidar is a differential absorption lidar operating in the oxygen A band absorption region (760 to 770 nm), and utilizes two tunable pulsed alexandrite lasers. For obtaining temperature measurements with an accuracy of less th...
Wavelength accuracy and stability are key requirements for differential absorption lidar (DIAL). We present a control and timing design for the dual-stabilized cw master lasers in a pulsed master-oscillator power-amplifier configuration, which forms a robust low-cost water-vapor DIAL transmitter system. This design operates at 823 nm ...
including phytoplankton carbon biomass and physiology ... Characterization of algal absorption spectra, since physiology is best ...
A coherent lidar system has been constructed for the measurement of alpha particles in a burning plasma. The lidar system consists of a pulsed CO{sub 2} laser transmitter and a heterodyne receiver. The receiver local oscillator is a cw, sequence-band CO{sub 2} laser operating with a 63.23 GHz offset from the ...
We have developed a lidar technique for measuring atmospheric CO2 concentrations as a candidate for NASA�s ASCENDS mission. It uses pulsed laser transmitters to simultaneously measure a CO2 absorption line in the 1570 nm band, O2 extinction in the Oxygen A-band and surface height and backscatter. The lidar ...
Water vapor is one of the most significant constituents of the atmosphere because of its role in cloud formation, precipitation, and interactions with electromagnetic radiation, especially its absorption of longwave infrared radiation. Some details of the role of water vapor and related feedback mechanisms in the Earth system need to be characterized better if local weather, ...
... Descriptors : *ATMOSPHERICS, *INFRARED TRANSMITTERS, ABSORPTION, BIBLIOGRAPHIES, HIGH ALTITUDE, INFRARED RADIATION ...
... TRANSMITTANCE, ABSORPTION, TRANSPARENCIES, MILITARY APPLICATIONS, REFLECTION, OPTICAL PROPERTIES, SCATTERING ...
This paper describes approaches for using the strong return signals from ground/sea reflections to improve upon the information that can be retrieved from spaceborne lidar observations. Relations are presented for computing lidar ground/sea returns, and examples are given for representative lidar parameters and surface characteristics. ...
Active remote sensing using lidar appears to be very attractive for the measurement of atmospheric greenhouse gases like carbon dioxide from spaceborne platforms. Feasibility studies are currently being performed to demonstrate the required measurement performance. Due to the high precision required (less than 0.3 %) for climate studies, space-borne IPDA (Integrating Path ...
The paper focuses on the problem of determining the attenuation coefficient at various distances along the lidar beam, or determining the transmission of the lidar radiation from one point to another along this beam. It is assumed that the lidar transmitter beam and receiver field of view are appropriately narrow ...
The development of an eye-safe, airborne LIDAR that exploits the decorrelation of the heterodyne signal to detect clear air turbulence is reported. A one watt average power transmitter is capable of detecting clear air turbulence to over 20 km is subvisua...
Investigations concerning the design of a solid state transmitter laser for a spaceborne lidar are presented. Wavelength is to be 700 to 800 nm. Tunability is advantageous. Q-switching operation is discussed. The properties of Alexandrite, an experimental...
It is a well accepted practice in the discussion of lidars to compare systems by a performance factor given by the product of the transmitter power and receiver aperture. This form of the performance factor reflects the two key parameters that determine t...
... Lidar Survey)system which consists of an airborne laser transmitter/receiver with a 1kHz. bathymetric laser and a10 kHz topographic laser. The system was ... ...
NBII National Biological Information Infrastructure
Sep 3, 2010 ... The all fiber version amplifier system can used as the OPO/OPA pumping laser for ASCENDS mission Lidar transmitter. ...
Aug 2, 2007 ... PHASE 1 CONTRACT NUMBER: NNX07CA64P ... of a single stabilized laser to both operate a high power transmitter and ... technology for future NASA Doppler lidar and High-Spectral Resolution Lidar (HSRL) aerosol missions. ...
A data acquisition and signal processing system is being developed for a 2-micron airborne wind profiling coherent Doppler lidar system. This lidar, called the Doppler Aerosol Wind Lidar (DAWN), is based on a Ho:Tm:LuLiF laser transmitter and 15-cm diamet...
The Phillips Laboratory Remote Optical Sensors (ROS) program is developing the Laser Airborne Remote Sensing (LARS) system for chemical detection using the differential absorption lidar (DIAL) technique. The system is based upon a high-power CO(subscript 2) laser which can use either the standard (superscript 12)C(superscript 16)O(subscript 2) or the ...
We have developed a lidar technique for measuring the tropospheric C02 concentrations as a candidate
Airborne Differential Absorption Lidar (DIAL) Field Experiment Examples: Example Aerosol, Ozone, and Water Vapor Images ...
Aug 4, 2011 ... In the DIAL technique, the gas concentration profile is determined by analyzing the lidar backscatter signals for laser wavelengths tuned ...
Mar 29, 2011 ... Tom McGee, Don Silbert. -Combines Rayleigh Lidar, Differential Absorption Lidar (DIAL), and Raman DIAL -Zenith viewing ...
DISSERTATIONS. 6. A High Spectral Resolution. Lidar Based on. Absorption. Filter . Paivi Piironen. ACADEMIC. DISSERTATION. To be present, with the permission ...
