Results 191 to 200 of about 14,602 (246)

Frequency chirped differential absorption LIDAR

SPIE Proceedings, 2006
We present a novel concept design of a differential absorption LIDAR for open path trace gas sensing in the atmosphere. To perform a range-resolved gas sensing we propose to arrange a set of retroreflectors in the laser beam path to measure a differential absorption in adjacent sections.
A. Lytkine, W. Jäger, J. Tulip
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Lidar differential absorption and scattering technique: theory

Applied Optics, 1983
The results of theoretical investigations of the differential absorption technique for sounding atmospheric water vapor are described in this paper. The sources of errors and their effect on the results of interpreting the sounding data are analyzed. The mathematical problems for inverting the lidar returns are considered.
V E, Zuev, Y S, Makushkin, V N, Marichev, A A, Mitsel, V V, Zuev   +4 more
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Coherent differential absorption lidar measurements of CO_2

Applied Optics, 2004
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.
Grady J, Koch, Bruce W, Barnes, Mulugeta, Petros, Jeffrey Y, Beyon, Farzin, Amzajerdian, Jirong, Yu, Richard E, Davis, Syed, Ismail, Stephanie, Vay, Michael J, Kavaya, Upendra N, Singh   +10 more
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Nonconventional coherent differential absorption lidar

SPIE Proceedings, 1992
A new detection method is presented for detecting the weak optical signal scattered back from a topographic target. The weak signal arriving from a topographic target is amplified by the frequency modulated transmitter laser of the lidar system and the amplified signal is mixed with the frequency shifted transmitter laser beam.
I. Peczeli, Peter I. Richter, Sz. Borocz, L. Halasz, R. C. Herndon   +4 more
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Multiple wavelength differential absorption lidar evaluation

Acta Physica Hungarica, 1984
Algorithms are shown for the interpretation and evaluation of multiple wavelength differential absorption lidar data for cases when only limited information is available about the molecular components present prior to the measurement. Experimental data are modeled by computer simulation of measurement, errors and reliability of the measurements are ...
T. I. Tarnóczi, P. Richter
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Airborne Differential Absorption Lidar

SPIE Proceedings, 1988
Airborne differential absorption lidarPeter RichterTechnical University Budapest, Department of Atomic Physics1521 Budapest, Budafoki ut 8. HungaryABSTRACTThe optical setup of an airborne differential absorption lidar based on optical heterody-ne detection of topographic backscattering of CW tunable CO2 lasers will be shown.
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Water vapor micropulse differential absorption lidar

SPIE Proceedings, 1999
By combining the capability of a differential absorption lidar (DIAL) and the excellent characteristics of a micro pulse lidar (MPL) we have designed and tested a micro pulse DIAL system, which could be operated from the ground or airborne platform, to monitor the atmospheric water vapor mixing ratio.
Choonghoon Oh, Coorg R. Prasad, Victor A. Fromzel, In H. Hwang, John A. Reagan, Hui Fang, Manuel Rubio   +6 more
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Doppler spectral scanning differential absorption lidar

SPIE Proceedings, 2002
Preliminary experiments toward the implementation of Doppler spectral scanning differential absorption lidar (DSS DIAL) are described. In separate tests, CO2 laser pulses were reflected from either a ground-based retroreflector (36-km round-trip distance) or a retroreflector on the GEOS-3 satellite (approximately 2000-km round-trip distance).
Bradley M. Jost, Daniel C. Senft, Diego F. Pierrottet, Mark A. Kovacs, Joe C. Cardani   +4 more
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CO 2 coherent differential absorption lidar

SPIE Proceedings, 2000
Experimental chemical detection and radiometric results are presented from recent coherent differential absorption lidar (DIAL) ground tests conducted over four kilometer horizontal path at the Air Force Research Laboratory. Heterodyne data was collected simultaneously with the Laser Airborne Remote Sensing direct detection DIAL sensor for comparison ...
Diego F. Pierrottet, Daniel C. Senft
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Sensitivity of coherent rage-resolved differential absorption lidar

Applied Optics, 1984
A range-resolved DIAL (differential absorption lidar) system with heterodyne detection has been developed. A hybrid TEA CO2 laser was employed as the transmitter oscillator, which emitted single-frequency pulses of 140 mJ. The heterodyne receiver, which had a minimum detectable power of 2 × 10−11 W, could detect the echo signals backscattered from ...
T, Fukuda, Y, Matsuura, T, Mori
openaire   +2 more sources