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Proceedings Paper

A three-beam aerosol backscatter correlation lidar for three-component wind profiling
Author(s): Anand Radhakrishnan Mylapore; Geary K. Schwemmer; Coorg R. Prasad; Sangwoo Lee; Alexander Achey; In Heon Hwang; Nikhil Mehta; Mikhail Yakshin; Konstantin Novoselov; Narasimha S. Prasad
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Paper Abstract

In this paper, we describe the development of a three-beam elastic lidar that utilizes aerosol backscatter correlation to measure three-component wind profiles for detecting and tracking aircraft wake vortices; turbulence intensity and wind shear profiles. High-resolution time-resolved wind information can currently be obtained with ultrasonic or hot-wire anemometers suitable for local point measurements, or with Doppler wind lidars that only measure line-of-sight wind speeds and have to be scanned over large measurement cone angles for obtaining three-component winds. By tracking the motion of aerosol structures along and between three near-parallel laser beams, our lidar obtains three-component wind speed profiles along the field of view (FOV) of the lidar beams. Our prototype lidar wind profiler (LWP) has three 8-inch transceiver modules placed in a near-parallel configuration on a two-axis pan-tilt scanner to measure winds up to 2km away. Passively q-switched near-infrared (1030nm) Yb:YAG lasers generate 12 - 18ns wide pulses at high repetition rate (about 10KHz) that are expanded and attenuated to eye-safe levels. Sensitive low noise detection is achieved even in daytime using a narrow FOV receiver, together with narrowband interference filters and single photoncounting Geiger-mode Si detectors. A multi-channel scaler retrieves the lidar return with 7.8ns bins (∼1.2m spatial resolution) and stores accumulated counts once every 50ms (20 profiles/sec). We adapted optical flow algorithms to obtain the movement of aerosol structures between the beams. The performance of our prototype LWP was validated using sonic anemometer measurements.

Paper Details

Date Published: 9 June 2014
PDF: 9 pages
Proc. SPIE 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI, 90800Y (9 June 2014); doi: 10.1117/12.2053066
Show Author Affiliations
Anand Radhakrishnan Mylapore, MassTech Inc. (United States)
Geary K. Schwemmer, Science and Engineering Services, Inc. (United States)
Coorg R. Prasad, Science and Engineering Services, Inc. (United States)
Sangwoo Lee, Science and Engineering Services, Inc. (United States)
Alexander Achey, Science and Engineering Services, Inc. (United States)
In Heon Hwang, Science and Engineering Services, Inc. (United States)
Nikhil Mehta, Science and Engineering Services, Inc. (United States)
Mikhail Yakshin, Science and Engineering Services, Inc. (United States)
Konstantin Novoselov, MassTech Inc. (United States)
Narasimha S. Prasad, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 9080:
Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI
Monte D. Turner; Gary W. Kamerman; Linda M. Wasiczko Thomas; Earl J. Spillar, Editor(s)

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