Xu, M.G., Geiger, H. and Dakin, J.P.
Interrogation of fibre-optic interferometric sensors using an acousto-optic tunable filter
Electronics Letters, 31, (17), . (doi:10.1049/el:19951037).
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A new technique for the interrogation of interferometric-based fibre-optic sensors using an acousto-optic tunable filter (AOTF) is demonstrated. The scheme involves frequency shift keying (FSK) of the RF drive to the AOTF to track the 3hift of a single fringe peak from an interferometric sensor. Experimental results are presented for a Fizeau interferometer. The technique provides high accuracy, plus a large unambiguous tracking range free from interruptions.
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