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Low-coherence Mach-Zehnder interrogation of fibre-Fabry-Perot sensor incorporating balanced detection

Fisher, Norman E. and Henderson, Philip J. and Jackson, David A. and Zhang, Lin and Bennion, Ian (1998) Low-coherence Mach-Zehnder interrogation of fibre-Fabry-Perot sensor incorporating balanced detection. In: Huang, Shangliang and Bennett, Kim D. and Jackson, David A., eds. Optical and Fiber Optic Sensor Systems. Proceedings of SPIE . SPIE, pp. 190-193. ISBN 0-8194-3016-1. (doi:10.1117/12.318199) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:17726)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL:
http://dx.doi.org/10.1117/12.318199

Abstract

In-fibre 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 (MHz) 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 fibre-Fabry-Perot sensor which is defined by Bragg-grating miners. 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-coherence 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.

Item Type: Book section
DOI/Identification number: 10.1117/12.318199
Additional information: Optical and Fiber Optic Sensor Systems BEIJING, PEOPLES R CHINA, SEP 16-19, 1998 SPIE; COS; COEMA
Uncontrolled keywords: sensors; fiber Bragg gratings; fiber optics sensors; mirrors; Fabry-Perot interferometers; ferroelectric materials
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: R.F. Xu
Date Deposited: 29 Jun 2009 08:57 UTC
Last Modified: 16 Nov 2021 09:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/17726 (The current URI for this page, for reference purposes)

University of Kent Author Information

Henderson, Philip J..

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Jackson, David A..

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