Cross beam wind measuring techniques
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The usefulness of the cross beam technique for measuring atmospheric wind speeds is discussed. Two remote photodetectors monitor the light scattering mainly from dust, water vapor, and atmospheric pollutants, which serve as tracers for the mean wind speed. The time required for the particles to travel from one beam to another (transit time) is computed by space-time correlations of the two signals. The transit time occurs at the maximum correlation between the fluctuations in the two signals. Since the beam separation is known, the wind speed may be computed, once the transit time is known. Six ...