An Experimental Verification of Laser-Velocimeter Sampling Bias and Its Correction

[+] Author and Article Information
D. A. Johnson

NASA Ames Research Center, Moffett Field, Calif. 94035

D. Modarress

Mechanical Engineering, California State University, Long Beach, Calif. 90840; NASA Ames Research Center, Moffett Field, Calif. 94035

F. K. Owen

Complere Inc., Palo Alto, Calif. 94302; NASA Ames Research Center, Moffett Field, Calif. 94035

J. Fluids Eng 106(1), 5-12 (Mar 01, 1984) (8 pages) doi:10.1115/1.3242405 History: Received March 01, 1983; Online October 26, 2009


The existence of “sampling bias” in individual-realization laser velocimeter measurements is experimentally verified and shown to be independent of sample rate. The experiments were performed in a simple two-stream mixing shear flow with the standard for comparison being laser-velocimeter results obtained under continuous-wave conditions. It is also demonstrated that the errors resulting from sampling bias can be removed by a proper interpretation of the sampling statistics. In addition, data obtained in a shock-induced separated flow and in the near-wake of airfoils are presented, both bias-corrected and uncorrected, to illustrate the effects of sampling bias in the extreme.

Copyright © 1984 by ASME
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