Results 191 to 200 of about 2,030,862 (242)

Differential absorption lidar sensing of ozone

Proceedings of the IEEE, 1989
The differential absorption lidar (DIAL) technique for deriving O/sub 3/ profiles from lidar measurements is discussed. The US National Aeronautics and Space Administration's airborne DIAL system is described, and examples of a broad range of O/sub 3/ and aerosol measurements are presented from a number of field experiments.
exaly   +2 more sources

Differential absorption lidar signal averaging

Applied Optics, 1988
This paper presents experimental results using an atmospheric backscatter dual CO(2) laser differential absorption lidar (DIAL). It is shown that DIAL signals can be averaged to obtain an N(-(1/2)) dependence decrease in the standard deviation of the ratio of backscattered returns from two lasers, where N is the number of DIAL signals averaged, and ...
W B, Grant, A M, Brothers, J R, Bogan
openaire   +2 more sources

Water Vapor Differential Absorption Lidar

2021
Water vapor is one of the fundamental thermodynamic variables that define the state of the atmosphere. It is highly variable in space and time and influences many important processes related to weather and climate. For more than two decades the importance of water vapor profiling has been underscored by the research and operational weather communities.
Scott M. Spuler, Matthew Hayman, Tammy M. Weckwerth   +2 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

The reference range for differential absorption lidars

Optical and Quantum Electronics, 1980
The concept of reference range for lidars is extended to the case of differential absorption lidars. A method for determining the wavelengths of operation, optimal from the point of view of maximum reference range for uniform and non-uniform absorbant distribution, is presented.
P. Richter, I. P�czeli
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

Water vapor differential absorption lidar development and evaluation

Applied Optics, 1979
A ground-based differential absorption lidar (DIAL) system is described which has been developed for vertical range-resolved measurements of water vapor. The laser transmitter consists of a ruby-pumped dye laser, which is operated on a water vapor absorption line at 724.372 nm.
E V, Browell, T D, Wilkerson, T J, McIlrath   +2 more
openaire   +2 more sources

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