Simultaneous interrogation of interferometric and Bragg grating sensors

Brady, G.P., Kalli, K., Webb, D.J., Jackson, D.A., Reekie, L. and Archambault, J.L. (1995) Simultaneous interrogation of interferometric and Bragg grating sensors Optics Letters, 20, (11), pp. 1340-1342. (doi:10.1364/OL.20.001340).


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We propose a new method for the simultaneous interrogation of conventional two-beam interferometers and Bragg grating sensors. The technique employs an unbalanced Mach-Zehnder interferometer illuminated by a single low coherence source, which acts as a wavelength-tunable source for the grating and as a path-matched filter for the Fizeau interferometer, thus providing a high phase resolution output for each sensor. The grating sensor demonstrates a dynamic strain resolution of ~0.05 µ.epsilon/root.Hz at 20 Hz, while the interferometric phase resolution is better than 1 mrad/root.Hz at 20 Hz, corresponding to an rms mirror displacement of 0.08 nm.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1364/OL.20.001340
ISSNs: 0146-9592 (print)
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ePrint ID: 78140
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Date Deposited: 11 Mar 2010
Last Modified: 27 Apr 2017 02:15
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