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Simultaneous interrogation of interferometric and Bragg grating sensors

Simultaneous interrogation of interferometric and Bragg grating sensors
Simultaneous interrogation of interferometric and Bragg grating sensors
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/√Hz at 20 Hz, while the interferometric phase resolution is better than 1 mrad/√Hz at 20 Hz, corresponding to an rms mirror displacement of 0.08 nm.
0146-9592
1340-1342
Brady, G.P.
7cc88d11-84a0-455f-97ba-ed53509782a5
Kalli, K.
a9861996-53bf-4427-90a7-c76e825dd671
Webb, D.J.
6fc412d4-f113-4e55-9e3a-dad18223a445
Jackson, D.A.
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Reekie, L.
ec314137-6924-44ad-86a4-ff3f9a67c1b5
Archambault, J.L.
22245ae0-fbe9-4d25-a850-f3b38c78848a
Brady, G.P.
7cc88d11-84a0-455f-97ba-ed53509782a5
Kalli, K.
a9861996-53bf-4427-90a7-c76e825dd671
Webb, D.J.
6fc412d4-f113-4e55-9e3a-dad18223a445
Jackson, D.A.
96d434a6-8a01-4702-ab8f-3174bf6f348e
Reekie, L.
ec314137-6924-44ad-86a4-ff3f9a67c1b5
Archambault, J.L.
22245ae0-fbe9-4d25-a850-f3b38c78848a

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), 1340-1342. (doi:10.1364/OL.20.001340).

Record type: Article

Abstract

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/√Hz at 20 Hz, while the interferometric phase resolution is better than 1 mrad/√Hz at 20 Hz, corresponding to an rms mirror displacement of 0.08 nm.

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Published date: 1995
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 78140
URI: http://eprints.soton.ac.uk/id/eprint/78140
ISSN: 0146-9592
PURE UUID: 69036bf4-9a05-493c-bf29-529ea22b9f3b

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Date deposited: 11 Mar 2010
Last modified: 13 Feb 2020 17:32

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