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Proceedings Paper

Multiple wavelength signal processing technique for short gauge length interferometric fiber sensors
Author(s): Abdelouahed Ezbiri; Ralph P. Tatam
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Paper Abstract

A low finesse fiber Fabry-Perot interferometric sensor is illuminated with five equally spaced axial modes from a multimode semiconductor laser diode source. The resulting intensity output is composed of five equally phase shifted optical frequencies, the intensities of which are used to determine the interferometric phase modulo 2 pi. This technique is shown to reduce the phase errors arising from multiply reflected beams, characteristic of the Fabry-Perot interferometer, by two orders of magnitude compared to techniques using two or three intensity outputs. The use of this technique is also shown to result in a reduction in cavity miscalibration errors when compared to previously reported signal processing techniques for Fabry-Perot interferometric sensors. The signal processing technique is demonstrated for temperature measurement where a 70 degree Celsius range and 0.07 degree Celsius resolution are obtained.

Paper Details

Date Published: 25 October 1996
PDF: 10 pages
Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); doi: 10.1117/12.255346
Show Author Affiliations
Abdelouahed Ezbiri, Cranfield Univ. (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)

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

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