3D fiber optic Laser Doppler Velocimetry

Stephen W. James; Robert A. Lockey; David A. Egan; Ralph P. Tatam; Robin L. Elder

doi:10.1117/12.255367

25 October 1996 3D fiber optic laser Doppler velocimetry

Stephen W. James, Robert A. Lockey, David A. Egan, Ralph P. Tatam, Robin L. Elder

Proceedings Volume 2839, Fiber Optic and Laser Sensors XIV; (1996) https://doi.org/10.1117/12.255367
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Single headed 3D laser Doppler velocimetry (LDV) geometries generally rely upon the use of 3 Doppler difference channels, inclined at differing angles with respect to the mechanical axes of the probe. The transformation between the non-orthogonal measurement coordinate system and the Cartesian system can result in large errors in the calculated velocities. A theoretical analysis of the geometrically induced uncertainties in measurements produced by four single headed 3D LDV configurations is presented. These considerations have lead to the development of a single headed LDV probe based around the use of two Doppler difference channels to directly measure the transverse velocity channels, and a reference beam channel to measure the on axis velocity component. The probe may be operated in two regimes using cw radiation and wavelength division multiplexing to distinguish the three channels, or using a pulsed source and time division multiplexing.

Citation Download Citation

Stephen W. James, Robert A. Lockey, David A. Egan, Ralph P. Tatam, and Robin L. Elder "3D fiber optic laser Doppler velocimetry", Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); https://doi.org/10.1117/12.255367

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