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Proceedings Paper

Low-coherence Mach-Zehnder interrogation of fiber Fabry-Perot sensor incorporating balanced detection
Author(s): Norman E. Fisher; Philip J. Henderson; David A. Jackson; Lin Zhang; Ian Bennion
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Paper Abstract

In fiber Bragg gratings are currently being evaluated as sensors for monitoring various parameters including the structural health of bridges, strain in advanced composites, and high frequency acoustic fields. These devices are attractive because they offer the benefits of ease of multiplexing, the simultaneous measurement of temperature, and a potentially low cost.In this paper, the core of our scheme comprises a fiber-Fabry-Perot sensor which is defined by Bragg-grating mirrors. Dynamic strains applied to the sensor change the optical path-length between the grating- mirrors and are encoded as a change in signal-phase. A low- coherent Mach-Zehnder processing interferometer, with a high-frequency phase-carrier in one arm, is used to interrogate the sensor. Using the fact that the two outputs of the interferometer are in anti-phase, we extend the approach by applying balanced detection to the Mach-Zehnder outputs in order to eliminate intensity-based optical noise. A noise-rejection better than 40dBV is demonstrated.

Paper Details

Date Published: 13 August 1998
PDF: 4 pages
Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); doi: 10.1117/12.318199
Show Author Affiliations
Norman E. Fisher, Univ. of Kent at Canterbury (United Kingdom)
Philip J. Henderson, Univ. of Kent at Canterbury (United Kingdom)
David A. Jackson, Univ. of Kent at Canterbury (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3555:
Optical and Fiber Optic Sensor Systems
Shanglian Huang; Kim D. Bennett; David A. Jackson, Editor(s)

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