Abstract
T T TILIZING an LDV to determine flow velocities has become \*J a widely used technique in laminar and turbulent flow studies. However, LDV's have had limited use in obtaining turbulence data, in particular for compressible flows, due to the difficulty of their continuously measuring instantaneous flow velocities. A novel velocity detection scheme that allows continuous and direct measurements of instantaneous flow velocities with an LDV has been developed. The technique, particularly applicable to measurements of high velocities, is based on a static slightly defocussed spherical Fabry-Perot interferometer (DFPS) used in conjunction with a special mask for the detection of instantaneous Doppler frequency shifts generated by the velocity fluctuations. Combining such a detector with an LDV, measurements of turbulence intensity and turbulence scale size were carried out in a high subsonic jet, and the results show good agreement with existing hot wire data.
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