A three-beam aerosol backscatter correlation lidar for three-component wind profiling

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

doi:10.1117/12.2053066

9 June 2014 A three-beam aerosol backscatter correlation lidar for three-component wind profiling

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

Author Affiliations +

Proceedings Volume 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI; 90800Y (2014) https://doi.org/10.1117/12.2053066
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

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.

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Anand Radhakrishnan Mylapore, Geary K. Schwemmer, Coorg R. Prasad, Sangwoo Lee, Alexander Achey, In Heon Hwang, Nikhil Mehta, Mikhail Yakshin, Konstantin Novoselov, and Narasimha S. Prasad "A three-beam aerosol backscatter correlation lidar for three-component wind profiling", Proc. SPIE 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI, 90800Y (9 June 2014); https://doi.org/10.1117/12.2053066

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