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Modified sagnac/mach–zehnder interferometer for distributed disturbance sensing

✍ Scribed by Anatoli A. Chtcherbakov; Pieter L. Swart; Stephanus J. Spammer; Beatrys M. Lacquet

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
135 KB
Volume
20
Category
Article
ISSN
0895-2477

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✦ Synopsis

We propose an alternati¨e configuration for an interferometric distributed fiber optic sensor. The sensor uses a combination of Mach᎐Zehnder and Sagnac interferometers sharing the same fiber. The output of the Sagnac interferometer is a function of the product of the position where the disturbance was applied and the magnitude of the disturbance. The output of the Mach᎐Zehnder interferometer is a function of the magnitude of the disturbance only. The position and magnitude of a disturbance applied to the sensing fiber can thus be obtained from these two signals. Results obtained with a 200 m distributed fiber sensor are discussed.

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