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Proceedings Paper

Demodulation of wavelength-encoded optical fiber sensor signals using fiber modal interferometers
Author(s): Vikram Bhatia; Mallika B. Sen; Kent A. Murphy; Anbo Wang; Richard O. Claus; Mark E. Jones; Jennifer L. Grace; Jonathan A. Greene
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Paper Abstract

We propose the use of modal interferometers to detect changes in the transmitted signal in high-finesse extrinsic Fabry-Perot interferometric cavities for real-time, absolute strain and temperature measurements. The short length of the cavity ensures a large free spectral range of the resulting output Airy pattern and by tracking the wavelength shift of one peak, the applied perturbation may be completely characterized. The same principle is also proposed to detect the signal reflected from fiber Bragg gratings for strain and temperature sensing. The relative merits and demerits of this demodulation scheme are discussed and preliminary experimental results are presented.

Paper Details

Date Published: 3 January 1996
PDF: 15 pages
Proc. SPIE 2594, Self-Calibrated Intelligent Optical Sensors and Systems, (3 January 1996); doi: 10.1117/12.229251
Show Author Affiliations
Vikram Bhatia, Virginia Polytechnic Institute and State Univ. (United States)
Mallika B. Sen, Virginia Polytechnic Institute and State Univ. (United States)
Kent A. Murphy, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)
Mark E. Jones, Fiber and Sensor Technologies, Inc. (United States)
Jennifer L. Grace, Fiber and Sensor Technologies, Inc. (United States)
Jonathan A. Greene, Fiber and Sensor Technologies, Inc. (United States)


Published in SPIE Proceedings Vol. 2594:
Self-Calibrated Intelligent Optical Sensors and Systems
Anbo Wang, Editor(s)

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