Results 151 to 160 of about 941 (199)

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

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
openaire   +2 more sources

Remote measurement of atmospheric mercury using differential absorption lidar [PDF]

Optics Letters, 1982
Atomic mercury in the atmosphere was detected by the differential-absorption lidar technique. Laser light at the mercury resonance wavelength of 253.65 nm was generated by anti-Stokes shifting in H(2) of the frequency-doubled output from a Nd:YAG-pumped dye laser.
Marcus Aldén, Hans Edner
exaly   +4 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

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