Simultaneous interrogation of interferometric and Bragg grating sensors

G. P. Brady; Kyriacos Kalli; David J. Webb; Laurence Reekie; Jean-Luc Archambault; David A. Jackson

doi:10.1117/12.219627

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15 September 1995 Simultaneous interrogation of interferometric and Bragg grating sensors

G. P. Brady, Kyriacos Kalli, David J. Webb, Laurence Reekie, Jean-Luc Archambault, David A. Jackson

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Proceedings Volume 2507, Distributed and Multiplexed Fiber Optic Sensors V; (1995) https://doi.org/10.1117/12.219627
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

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.

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G. P. Brady, Kyriacos Kalli, David J. Webb, Laurence Reekie, Jean-Luc Archambault, and David A. Jackson "Simultaneous interrogation of interferometric and Bragg grating sensors", Proc. SPIE 2507, Distributed and Multiplexed Fiber Optic Sensors V, (15 September 1995); https://doi.org/10.1117/12.219627

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