Abstract
A laser Doppler system for the measurement of atmospheric wind velocity and turbulence has been developed. This system utilizes the Doppler frequency shift undergone by a beam of radiation when scattered by particles suspended in the flows. From the measurement of this difference frequency between the scattered and the reference laser light and knowledge of the geometry of the system, the velocity is directly determined. A three-dimensional system has been developed for wind tunnel and jet type flow studies. Using this system, measurements of velocity have been made in wind tunnels and in jet flows with velocities in excess of Mach 2 and compared with theory and hot wire instrumentation. The agreement was good.
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