Results 171 to 180 of about 897 (200)

Laser prf considerations in differential absorption lidar applications

Applied Optics, 1983
Laser pulse repetition frequency (prf) is a major factor in determining the performance of differential absorption lidar (DIAL) systems. The effects of laser prf on concentration measurement accuracy and maximum usable range are quantified. Heterodyne-detection (coherent) and direct-detection (noncoherent) as well as path-averaged and range-resolved ...
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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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Numerical simulation for differential absorption lidar system

SPIE Proceedings, 2007
In the recent years, the most country in the word attach importance to the environmental and the protection of environmental doubly. The differential absorption lidar (DIAL)operating in the infrared wavelengths is a powerful standoff sensor for rapid remote detection of chemical emissions.
WeiRan Wang, ShiRong Yin
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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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Differential-Absorption Lidar for Water Vapor and Temperature Profiling

2006
The application of differential absorption lidar to narrow lines of the rotational-vibrational spectrum of water vapor or oxygen for humidity and temperature profiling is technically demanding with respect to the laser source and the data acquisition. Many details need to be considered carefully in system design and data evaluation.
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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
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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
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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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Atmospheric tomography using differential absorption lidar

SPIE Proceedings, 1997
Differential Absorption Lidar measurements from a satellite platform are more complex and can yield more information than terrestrial DIAL measurements because of the significant Doppler shift associated with high satellite velocity relative to the atmosphere. This Doppler effect can be exploited as an extra degree of freedom in matching laser lines to
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Differential Absorption LiDAR for NASA Ozone Mapping

Knowing how much and where ozone is in our atmosphere is important to daily life on Earth. Ozone present in the stratosphere is critical to protecting life from harmful radiation, but ozone in the troposphere is detrimental. NASA has created a network specifically tasked with measuring and mapping the ozone in the troposphere.
Jeremiah Hashley, Lisa Mueller
openaire   +1 more source