A distributed fiber sensor is described to determine the location of disturbances along a length of optical fiber. The sensor constitutes two Sagnac interferometers: one with a position-dependent response to time-varying disturbances, and the other Sagnac with no position-dependent output. The signals are detected and converted to spatial information. Results obtained with a 200 m long sensor are discussed.
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Spammer et al. (1998) studied this question.