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. Spie-Int Soc Optical Engineering, USA pp. 190-193. ISBN 0-8194-3016-1. (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)

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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: Conference or workshop item (Paper)
Additional information: Optical and Fiber Optic Sensor Systems BEIJING, PEOPLES R CHINA, SEP 16-19, 1998 SPIE; COS; COEMA
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: R.F. Xu
Date Deposited: 29 Jun 2009 08:57
Last Modified: 25 Jun 2014 14:22
Resource URI: https://kar.kent.ac.uk/id/eprint/17726 (The current URI for this page, for reference purposes)
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