Measurement of supersonic velocity and turbulence by laser anemometry

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Abstract
The application of laser anemometry to the study of turbulent supersonic flow is discussed. An analysis is presented showing that the direct frequency method of measurement of the Doppler shift in frequency undergone by light scattered from flow borne particles using a single frequency laser and a Fabry-Perot interferometer has significant advantages over optical heterodyning. It is shown that a confocal rather than a plane Fabry-Perot used in conjunction with an argon laser is the most suitable instrumentation for this application. Preliminary results are presented of measurements made on a supersonic wind tunnel and a free jet.