Angular bias errors in three-component laser velocimeter measurements
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Naval Architecture and Marine Engineering
For three-component laser velocimeter systems, the change in projected area of the coincident measurement volume for different flow directions will introduce an angular bias in naturally sampled data. In this study, the effect of turbulence level and orientation of the measurement volumes on angular bias errors was examined. The operation of a typical three-component laser velocimeter was simulated using a Monte Carlo technique. Results for the specific configuration examined show that for turbulence levels less than 10% no significant bias errors in the mean velocities will occur and errors in the root-mean-square (r.m.s.) velocities will be less than 3% for all orientations. For turbulence levels less than 30%, component mean velocity bias errors less than 5% of the mean velocity vector magnitude can be attained with proper orientation of the measurement volume; however, the r.m.s. velocities may be in error as much as 10%. For turbulence levels above 50%, there is no orientation which will yield accurate estimates of all three mean velocities; component mean velocity errors as large as 15% of the mean velocity vector magnitude may be encountered.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 427987
- Journal Information:
- Journal of Fluids Engineering, Vol. 118, Issue 3; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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