Results 131 to 140 of about 1,690 (181)

Optimizing a pulsed Doppler lidar

Applied Optics, 1990
NOAA's fieldable injection-seeded, pulsed, coherent CO(2) lidar was developed over a 5-yr period. Its performance and reliability are characterized. Techniques for calibration, alignment, collimation, and for improving detector performance and frequency stability are presented.
M J, Post, R E, Cupp
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Doppler lidar atmospheric wind sensor: reevaluation of a 355-nm incoherent Doppler lidar

Applied Optics, 1990
We reevaluate the performance of an incoherent Doppler lidar system operating at 354.7 nm, based on recent but well-proven Nd:YAG laser technology and currently available optical sensors. For measurements in the lower troposphere, up to ~5 km altitude, and also in the Junge-layer of the lower stratosphere, a wind component accuracy of +/- 2 m/s and a ...
D, Rees, I S, McDermid
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The Doppler Rayleigh lidar system at Arecibo

IEEE Transactions on Geoscience and Remote Sensing, 1993
The instrument structure and the operation of a Doppler Rayleigh lidar located at the Arecibo Observatory in Puerto Rico are described. The device consists of an injection seeded, frequency doubled, Nd:YAG laser coupled with a small Newtonian telescope and a single etalon, Fabry-Perot interferometer in its receiver. With this combination of transmitter
Craig A. Tepley, Stoyan I. Sargoytchev, Roberto Rojas   +2 more
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Airborne cw-Doppler lidar ADOLAR

Conference Proceedings Second Topical Symposium on Combined Optical-Microwave Earth and Atmosphere Sensing, 2002
During the last 10 years the DLR container LDA (Laser Doppler Anemometer) was used for many wind related measurements in the atmospheric boundary layer (Kopp et al., 1984). Based on the experiences on airborne cw-Doppler lidar was developed and tested. Wind field measurements in the boundary layer and signal strength studies were performed. >
Werner, Ch., Rahm, S.
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Tropospheric Wind Profiling with Doppler Lidar

Proceedings of European Meeting on Lasers and Electro-Optics CLEOE-96, 1996
A coherent Doppler LIDAR system for remote sensing of atmospheric winds has been developed by Kayser-Threde GmbH. The system is devoted for meteorological airport surveillance and for atmospheric research studies. A diode- pumped Tm:YAG laser system generates eye-safe laser pulses with 3 mJ output energy, 600 nsec duration (full width half maximum FWHM)
J. Roths, V. Klein, B. Hilber, R. Heilmann   +3 more
openaire   +1 more source

Calibration of a cw infrared Doppler lidar

Applied Optics, 1980
A moving scattering target used as a transfer standard allows absolute calibration of the response of a cw Doppler lidar to an atmospheric target. The lidar in this study operated at a 10.6-microm wavelength. Consideration of the distribution of radiant energy density near the focus of the lidar transceiver permits measurement of a backscatter ...
R L, Schwiesow, R E, Cupp
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Doppler Lidar Observations of Hydrometeors

Journal of Applied Meteorology, 1974
Abstract Significant Doppler lidar returns have been observed from snow and rain. This demonstrates the feasibility of measuring velocity and range of hydrometeors with 10.6-μm wavelength CO2 laser lidar.
N. L. Abshire, R. L. Schwiesow, V. E. Derr   +2 more
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Airborne cw Doppler Lidar - ADOLAR

Coherent Laser Radar, 1995
For the airborne measurement of the wind field, knowledge of the exact velocity and orientation of the plane is mandatory. Any small deviation in these parameter will cause an error in the estimation of the wind field. The conical scanning airborne cw CO2 Doppler lidar ADOLAR has been designed to gain experience concerning the correction of the ...
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Airborne Doppler lidar wind measurements

Conference Digest. 2000 Conference on Lasers and Electro-Optics Europe (Cat. No.00TH8505), 2000
Summary form only given. Study of the atmospheric wind field is fundamental for the understanding and prediction of the weather development. To overcome the spatial limitations of ground based observations, airborne measurements are recognised as excellent tools to study atmospheric processes.
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Nd:YAG Doppler Lidar with Optical Amplifier

Advanced Solid State Lasers, 1991
Velocities are measured with a Doppler-LIDAR by measuring the frequency shift of the backscattered radiation. This Doppler-shifted signal is heterodyned with a local oscillator radiation which has the same frequency as the transmitted signal. The laser of this Doppler-LIDAR technique combines three functions of a LIDAR.
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