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Proceedings Paper

Application of low-coherence optical fiber Doppler anemometry to fluid-flow measurement: optical system considerations
Author(s): William J. O. Boyle; Kenneth T. V. Grattan; Andrew W. Palmer; B. T. Meggitt
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Paper Abstract

A fiber optic Doppler anemometric (FODA) sensor using an optical delay cavity technique and having the advantage of detecting velocity rather than simple speed is outlined. In this sensor the delay in a sensor cavity formed from light back-reflected from a fiber tip (Fresnel reflection) and light back-reflected from particles flowing in a fluid is balanced by the optical delay when light from this sensor cavity passes through a reference cavity formed by a combination of the zero and first diffraction orders produced by a Bragg cell inserted into the optical arrangement. The performance of an experimental sensor based on this scheme is investigated, and velocity measurements using the Doppler shift data from moving objects are presented. The sensitivity of the scheme is discussed, with reference to the other techniques of fluid flow measurement.

Paper Details

Date Published: 1 August 1991
PDF: 6 pages
Proc. SPIE 1511, Fiber Optic Sensors: Engineering and Applications, (1 August 1991); doi: 10.1117/12.45978
Show Author Affiliations
William J. O. Boyle, City Univ./London (United Kingdom)
Kenneth T. V. Grattan, City Univ./London (United Kingdom)
Andrew W. Palmer, City Univ./London (United Kingdom)
B. T. Meggitt, Sira Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 1511:
Fiber Optic Sensors: Engineering and Applications
Anastasius J.A. Bruinsma; Brian Culshaw, Editor(s)

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