The special wide-field Michelson interferometer designed at ISL transforms the Doppler frequency shift of light scattered by tracer particles crossing a light sheet into a shift of luminous intensity at the output of the Michelson interferometer, yielding information about the particle velocity. To overcome former disadvantages, the optical set-up as well as the Doppler picture-processing algorithm were further improved. The present status of Doppler picture velocimetry (DPV) is explained by means of measurements carried out at Mach 6 in the ISL shock tunnel STA. The vertical velocity distribution around several bodies, such as a wedge, a sphere and a cylinder was visualized and measured.
Experiments in Fluids – Springer Journals
Published: Jan 29, 2008
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