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Proceedings Paper

3D fiber optic Laser Doppler Velocimetry
Author(s): Stephen W. James; Robert A. Lockey; David A. Egan; Ralph P. Tatam; Robin L. Elder
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Paper 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.

Paper Details

Date Published: 25 October 1996
PDF: 12 pages
Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); doi: 10.1117/12.255367
Show Author Affiliations
Stephen W. James, Cranfield Univ. (United Kingdom)
Robert A. Lockey, Cranfield Univ. (United Kingdom)
David A. Egan, Cranfield Univ. (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)
Robin L. Elder, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 2839:
Fiber Optic and Laser Sensors XIV
Ramon P. DePaula; John W. Berthold, Editor(s)

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