Vol. 23, issue 08, article # 12

Abstract:

The results of experimental prove of the method of estimate of the integral along a wind velocity path based on the determination of the variance of speed of the energy centroid displacements in the images of a laser beam, passed through the path, are presented. The method is compared with the optical methods of the integral velocity estimation based on "temporal" and "spatial" variants of the correlation and spectral analysis of intensity fluctuations in the laser beam images. It is shown that the results of the integral wind velocity estimation by all three optical methods are in agreement with each other and with the results of local measurements of wind velocity by ten sonic anemometers, placed along the sounding path.

Keywords:

wind speed, turbulence, atmosphere, laser beam, intensity, video image, space-time correlation, image centroid, dispersion, phase spectrum