21 October 2014 Experimental evaluation of optical crosswind measurement systems
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Abstract
A series of experiments have been conducted to evaluate the accuracy of single station, optical systems for measurement of average crosswind velocity. By analyzing the spatial-temporal cross-correlation function of signals caused by turbulence-induced refractive index irregularities, the wind velocity perpendicular to the line of sight is determined. This method allows also for direct measurement of the turbulence structure parameter Cn 2 by the angle-of arrival technique. These real-time turbulence values are incorporated into the wind vector estimation to achieve higher accuracy. The evaluated systems include an active technique which measures the backscatter of the transmitted laser pulses and a passive technique where the naturally illuminated scene serves as the light source. Both active and passive systems have been compared to a series of ultrasonic anemometers located along the measurement path. The experiments were performed along a uniform path in various locations. Very good fits (about 0.5 m/sec) have been obtained at all turbulence conditions along a 1000m path.
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A. Engel, A. Engel, O. Porat, O. Porat, J. Shapira, J. Shapira, A. Englander, A. Englander, } "Experimental evaluation of optical crosswind measurement systems", Proc. SPIE 9242, Remote Sensing of Clouds and the Atmosphere XIX; and Optics in Atmospheric Propagation and Adaptive Systems XVII, 92421K (21 October 2014); doi: 10.1117/12.2072793; https://doi.org/10.1117/12.2072793
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