Multiple wavelength signal processing technique for short gauge length interferometric fiber sensors

Abdelouahed Ezbiri; Ralph P. Tatam

doi:10.1117/12.255346

25 October 1996 Multiple-wavelength signal processing technique for short gauge length interferometric fiber sensors

Abdelouahed Ezbiri, Ralph P. Tatam

Proceedings Volume 2839, Fiber Optic and Laser Sensors XIV; (1996) https://doi.org/10.1117/12.255346
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Abdelouahed Ezbiri and Ralph P. Tatam "Multiple-wavelength signal processing technique for short gauge length interferometric fiber sensors", Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); https://doi.org/10.1117/12.255346

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