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RESEARCH PAPERS

A Comparison of Four Velocity Bias Correction Techniques in Laser Doppler Velocimetry

[+] Author and Article Information
R. D. Gould, K. W. Loseke

Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695

J. Fluids Eng 115(3), 508-514 (Sep 01, 1993) (7 pages) doi:10.1115/1.2910168 History: Received January 28, 1992; Revised November 16, 1992; Online May 23, 2008

Abstract

Data from a two-component dual-beam laser-Doppler Velocimeter were used to evaluate four different velocity bias correction methods. The data were collected over a range of valid data rates from 100 Hz to 20 kHz at four flow locations in a shear layer. Turbulence intensities ranged from 15 to 100 percent. Flow statistics were calculated using these proposed velocity bias correction techniques. The results were compared to the unbiased values, which were obtained using an approximated equal-time sampling technique. Some of the correction schemes performed well at low turbulence levels, but became ineffective at high turbulence levels. One ad hoc empirical correction scheme showed relatively good results throughout.

Copyright © 1993 by The American Society of Mechanical Engineers
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