Results 141 to 150 of about 307 (173)

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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Potential for coherent Doppler wind velocity lidar using neodymium lasers

Applied Optics, 1984
Existing techniques for the frequency stabilization of Nd:YAG lasers operating at 1.06 micron, and the high-gain amplification of radiation at that wavelength, make possible the construction of a coherent Doppler wind velocity lidar using Nd:YAG. Velocity accuracy and range resolution are better at 1.06 micron than at 10.6 microns at the same level of ...
T J, Kane, B, Zhou, R L, Byer
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Wind profiling for a coherent wind Doppler lidar by an auto-adaptive background subtraction approach

Applied Optics, 2017
Auto-adaptive background subtraction (AABS) is proposed as a denoising method for data processing of the coherent Doppler lidar (CDL). The method is proposed specifically for a low-signal-to-noise-ratio regime, in which the drifting power spectral density of CDL data occurs.
Yanwei, Wu, Pan, Guo, Siying, Chen, He, Chen, Yinchao, Zhang   +4 more
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Combining direct and coherent detection for Doppler wind lidar

SPIE Proceedings, 2004
Using a combination of two modest sized coherent and direct detection Doppler lidars may offer significant advantages over the single detection method approaches. All space-based Doppler wind lidar proposed missions to date have been based upon a single detection scheme, either coherent (WINDSAT, LAWS, SPARCLE, JEM/CDL) or direct (Zephyr, ALADIN, ADM ...
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Tropospheric Wind Measurements with an Airborne Scanning Coherent Doppler Lidar

Optical Remote Sensing of the Atmosphere, 1997
Since the first remote wind measurements in 1967, coherent Doppler lidar has become established as a unique tool for atmospheric research. Remote sensing of the two-dimensional horizontal wind field with airborne coherent Doppler lidar was demonstrated in 1981 using a low-energy scanning CO2 lidar.1 The scanner and operations control system were ...
Jeffry Rothermel, R. Michael Hardesty, James N. Howell, Steven C. Johnson, Robert T. Menzies, David M. Tratt, Dean R. Cutten   +6 more
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Characterization of turbulent wake of wind turbine by coherent Doppler lidar

SPIE Proceedings, 2014
The indispensable access to real turbulent wake behavior is provided by the pulsed coherent Doppler Light Detection and Ranging (LIDAR) which operates by transmitting a laser beam and detecting the radiation backscattered by atmospheric aerosol particles. The Doppler shift in the frequency of the backscattered signal is analyzed to obtain the line-of-
Songhua Wu, Jiaping Yin, Bingyi Liu, Jintao Liu, Rongzhong Li, Xitao Wang, Changzhong Feng, Quanfeng Zhuang, Kailin Zhang   +8 more
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1-bit sampling acquisition method for coherent Doppler wind lidar

Applied Optics
Coherent Doppler wind lidar (CDWL) is a critical technology in wind measurement. However, the large volume of data generated during detection poses a significant challenge for data acquisition and processing systems. While 1-bit sampling using a comparator (CMP) has been proposed to reduce FPGA resource consumption ...
Baolin Chen, Wenhao Li, Ge Jin, Chong Wang, Lian Chen, Houbing Lu   +5 more
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Basic principles of pulsed-wind Doppler lidars with multitime coherence

Laser Physics, 2008
A concept of multitime coherence (MTC) of optical beams is proposed. Two versions of fiber multiplicator topologies are presented, which are intended for the generation of multiple fiber pulses (MFP) possessing the MTC property. The fiber multiplicators may be a useful tool for Doppler laser anemometry of spatially separated scattering objects ...
G. G. Matvienko, S. N. Polyakov, V. K. Oshlakov   +2 more
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Performance of a 2-µm Coherent Doppler Lidar for Wind Measurements

Journal of Atmospheric and Oceanic Technology, 1994
Abstract Measurements of boundary layer winds are presented using a 2-µm coherent Doppler lidar and the optimal performance of the maximum likelihood estimator. The systematic error for single-shot estimates was estimated as 3.6 cm s−1 using measurements from a stationary hard target. The estimation error for measurements of the radial component of the
Rod Frehlich, Stephen M. Hannon, Sammy W. Henderson   +2 more
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Coherent Doppler wind lidar for the Japanese experimental module of the ISS

Optical Remote Sensing, 2003
A feasibility study has been done for a space-borne 2micron coherent Doppler lidar system aiming at demonstration of the technology onboard the Japanese Experiment module of the International Space Station. We are also developing an airborne coherent Doppler lidar system for simulation of the Doppler lidar measurement in space.
Toshikazu Itabe, Kohei Mizutani
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