Results 211 to 220 of about 14,602 (246)

Wasserdampf-Differential-Absorptions-Lidar im nahen Infrarot

1992
Lidar (Light Detection and Ranging) ist ein aktives Fernmesverfahren zur Sondierung der Atmosphare. Ahnlich wie Radaranlagen senden Lidargerate kurze elektromagnetische Pulse aus. Als Sender werden leistungsstarke gepulste Festkorper- und Gas-Laser eingesetzt, deren Wellenlangen im sichtbaren und infraroten Spektralbereich liegen. Ein kleiner Bruchteil
G. Ehret, C. Kiemle, W. Renger, G. Simmet   +3 more
openaire   +1 more source

Differential Absorption Lidar Measurements of Atmospheric Species

Topical Meeting on Optical Techniques for Remote Probing of the Atmosphere, 1983
Interest in remote measurements of atmospheric gases has gained increased emphasis in recent years because of the need to assess the impact of man's activity on his environment. It has been recognized that knowledge of the sources, sinks, transport, and chemistry of atmospheric species must be obtained over large scales to understand the balance ...
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Probing Air Pollutants by Differential Absorption LIDAR

1992
Air pollution is related with numerous different physical, chemical and meteorological phenomena. So, the atmospheric equilibrium depends on hundreds of chemical species, but only few of them are directly emitted and considered as main pollutants. All the others are trace constituents, being nevertheless of outstanding importance for the chemical ...
H. J. Kölsch, P. Rairoux, J. P. Wolf, L. Wöste   +3 more
openaire   +1 more source

Remote sensing of NO using a differential absorption lidar

Applied Optics, 1980
Single-ended remote sensing measurements of atmospheric NO have been made using differential absorption of frequency-doubled pulsed CO(2) laser radiation backscattered from topographic targets. Returns were obtained from targets at ranges out to 1.4 km, and significant NO concentrations above ambient were observed over a path which crossed a traffic ...
N, Menyuk, D K, Killinger, W E, Defeo
openaire   +2 more sources

Infrared differential absorption Lidar (DIAL) measurements of hydrocarbon emissions

Journal of Environmental Monitoring, 2011
We report the application of an infrared (IR) differential absorption Lidar (DIAL) system (also capable of ultra violet measurements) built at the National Physical Laboratory (NPL), UK, to field measurements of total site emissions (controlled and fugitive) from petrochemical and landfill installations.
Rod, Robinson, Tom, Gardiner, Fabrizio, Innocenti, Peter, Woods, Marc, Coleman   +4 more
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Differential absorption lidar system for routine monitoring of tropospheric ozone

Applied Optics, 1994
A differential absorption lidar system for routine profiling of tropospheric ozone for daytime and nighttime operation is described. The system uses stimulated Raman scattering in hydrogen and deuterium of 266-nm radiation from a quadrupled Nd:YAG laser.
Sunesson, JA, Apituley, A, Swart, DPJ
openaire   +3 more sources

Infrared Differential Absorption Lidar for Vapor Detection

1988
Abstract : Ground-mobile and airborne carbon dioxide laser systems were developed to measure vapor clouds using differential absorption lidar (DIAL) techniques. Field testing with the ground-mobile lidar detected a vapor cloud at 7 km using the return signal from a topographic target at a range of 8.5 km.
P. L. Holland, E. E. Uthe, J. van der Laan, K. R. Phelps, J. P. Carrico   +4 more
openaire   +1 more source

Analytical differentiation of the differential-absorption-lidar data distorted by noise

Applied Optics, 2002
A method of analytical differentiation is developed for processing differential absorption lidar (DIAL) data. The method is based on simple analytical transformation of the DIAL on and off signal ratio. The derivatives consequently are found for either individual data points or local zones of the measurement range.
openaire   +2 more sources

Detection and discrimination using multiple-wavelength differential absorption lidar

Applied Optics, 1985
A methodology is presented for generalizing two-wavelength single-material differential absorption lidar to multiple wavelengths for use in simultaneous multimaterial detection and discrimination. A key role in the analysis is played by the concentration path length (CL) product covariance matrix ΛĈL, which generalizes the CL variance.
openaire   +2 more sources

Effect of pulse-pair correlation on differential absorption lidar

Applied Optics, 1985
Calculations are presented of the effect of pulse-pair correlation on the detection statistics of alarm systems using differential absorption lidar (DIAL) for the remote sensing of toxic gases. This experimentally observed correlation is found to have a significant beneficial effect on the performance of such systems. The calculations are performed for
openaire   +2 more sources