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Statistical Analysis of Velocity Measuring Systems Employing the Photon Correlation Technique

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2 Author(s)
Durrani, T.S. ; University of Southampton Southampton, England ; Greated, C.

Velocities of fluid flows and solid objects can be measured by performing photon count correlations on laser light scattered from the measuring region, the most common optical configuration being the laser Doppler system. A statistical analysis for the counting process is presented for both the constant velocity case and for turbulent fluid flows with formulations for specific laser Doppler configurations. For turbulent flow, relationships are derived for the shape of the count correlation in terms of the mean velocity and rms turbulent intensity, taking into account the shape of the turbulence correlation curve. Experimental results recorded for both a constant velocity solid object and for an unseeded turbulent air flow in a wind tunnel are presented, and, in the latter case, comparisons are made with hot-wire measurements.

Published in:

Aerospace and Electronic Systems, IEEE Transactions on  (Volume:AES-10 ,  Issue: 1 )

Date of Publication:

Jan. 1974

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