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Proceedings Paper

Simultaneous interrogation of interferometric and Bragg grating sensors
Author(s): G. P. Brady; Kyriacos Kalli; David J. Webb; Laurence Reekie; Jean-Luc Archambault; David A. Jackson
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Paper Abstract

A new method for the simultaneous interrogation of conventional two-beam interferometers and Bragg grating sensors is proposed and demonstrated. An unbalanced Mach-Zehnder interferometer illuminated by a low coherence source is used to act as a wavelength tunable source for the grating and as a path matched filter for a Fizeau cavity. The technique gives high phase resolution. The grating sensor gave a dynamic strain resolution of approximately equals 0.05 (mu) (epsilon) /(root)Hz at 20 Hz and the interferometric resolution was better than 1 mrad/(root)Hz at 20 Hz, corresponding to an rms mirror displacement of 0.08 nm.

Paper Details

Date Published: 15 September 1995
PDF: 7 pages
Proc. SPIE 2507, Distributed and Multiplexed Fiber Optic Sensors V, (15 September 1995); doi: 10.1117/12.219627
Show Author Affiliations
G. P. Brady, Univ. of Kent at Canterbury (United Kingdom)
Kyriacos Kalli, Univ. of Kent at Canterbury (United Kingdom)
David J. Webb, Univ. of Kent at Canterbury (United Kingdom)
Laurence Reekie, Univ. of Southampton (United Kingdom)
Jean-Luc Archambault, Univ. of Southampton (United Kingdom)
David A. Jackson, Univ. of Kent at Canterbury (United Kingdom)


Published in SPIE Proceedings Vol. 2507:
Distributed and Multiplexed Fiber Optic Sensors V
John P. Dakin; Alan D. Kersey, Editor(s)

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