Results 151 to 160 of about 492 (181)

Field performance of an all-semiconductor laser coherent Doppler lidar

Optics Letters, 2012
We implement and test what, to our knowledge, is the first deployable coherent Doppler lidar (CDL) system based on a compact, inexpensive all-semiconductor laser (SL). To demonstrate the field performance of our SL-CDL remote sensor, we compare a 36 h time series of averaged radial wind speeds measured by our instrument at an 80 m distance to those ...
Peter John, Rodrigo, Christian, Pedersen
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Coherent Doppler Lidars for Wind Sensing in the Atmosphere

Topical Meeting on Optical Techniques for Remote Probing of the Atmosphere, 1983
The development of wind sensing coherent Doppler lidars over the past 15 years has progressed from CW homodyne to sophisticated, pulsed heterodyne systems.
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The NOAA 2 μm Coherent Doppler Lidar

Optical Remote Sensing of the Atmosphere, 1995
The NOAA Environmental Technology Laboratory has constructed a 200 Hz pulse repetition rate, 30 m range resolution, 2 μm wavelength Doppler lidar using coherent detection and a double-end CW-diode-pumped, injection-seeded, Q-switched Tm:LuYAG laser of our own design.
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Short-pulse, coherent Doppler Nd:YAG lidar

Optical Engineering, 1991
A short pulse (8 ns) coherent Nd:YAG lidar at 1.06 im has been developed for 1 m range-resolved lidar measurements of high velocity (>1 km/s) aerosol or distributed targets with a Doppler shift bandwidth of up to 1 GHz. This system, which also permitted simultaneous heterodyne and direct detection, has been utilized to make, for the first time, an ...
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Development of a coherent Doppler lidar to measure atmosphere windshear

2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian Conference on Optics, Lasers and Spectroscopy and the Australian Conference on Optical Fibre Technology, 2011
A pulsed coherent Doppler lidar prototype at wavelength of 1064nm was developed to measure windshear in the lower troposphere layer. The laser transmitter was an injection-seeded pulsed Nd:YAG laser with pulse energy of 0.5mJ, pulse duration of 80ns and pulse repetion rate of 200Hz.
Jiqiao Liu, Xiaopeng Zhu, Jun Zhou, Huaguo Zang, Yan He, Dan Liu, Weibiao Chen   +6 more
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Doppler Lidar Using Coherently Locked Dual Frequencies

Frontiers in Optics, 2005
A tunable microwave subcarrier on an optical wave is generated by the nonlinear dynamics of a semiconductor laser for Doppler lidar measurement. This new technique is capable of accurately measuring velocities down to 10 μm/s.
Rosemary Diaz, Jia-Ming Liu
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Coherent Doppler Lidar Performance in the Weak Signal Regime

Coherent Laser Radar, 1995
Coherent Doppler lidar has become a mature method of remote measurements of wind fields[l, 2, 3]. The development of the eyesafe 2µm coherent Doppler lidar has permitted regular observations of boundary layer winds. Coherent Doppler lidar permits measurements of the radial component of the velocity v as a function of range for every transmitted pulse ...
Rod Frehlich, Stephen M. Hannon, Sammy W. Henderson   +2 more
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Development of all-solid coherent Doppler wind lidar

Chinese Optics Letters, 2012
A 1 064-nm pulsed coherent Doppler lidar (CDL) prototype is developed to measure short range wind speed in the lower altitude troposphere layer. The CDL system adopts an injection{seeded Nd:YAG laser with the pulse duration of 80 ns, single pulse energy of 0.5 mJ, and pulse repetition rate of 200 Hz.
Xiaopeng Zhu Xiaopeng Zhu, Jiqiao Liu Jiqiao Liu, Decang Bi Decang Bi, Jun Zhou Jun Zhou, Weifeng Diao Weifeng Diao, Weibiao Chen Weibiao Chen   +5 more
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All Fiber Coherent Doppler LIDAR for Wind Sensing

MRS Proceedings, 2008
ABSTRACTAn 1.5 micron pulsed Coherent Doppler LIDAR system using all fiber optical components has attracted attention for remote wind sensing application because of its eye-safety, reliability and easy deployment. We report on our key technologies such as fiber based MOPA (Master Oscillator Power Amplification) transmitter, high peak power optical ...
Toshiyuki Ando, Shumpei Kameyama, Kimio Asaka, Yoshihito Hirano, Hisamichi Tanaka, Hamaki Inokuchi   +5 more
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Autonomous beam alignment for coherent Doppler lidar with multielement detectors

Applied Optics, 1999
Autonomous beam alignment for coherent Doppler lidar requires accurate information about optical misalignment and optical aberrations. A multielement heterodyne detector provides the required information without a loss in overall system performance. The effects of statistical variations from the random backscattered field (speckle field) are determined
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