High-spatial-resolution distributed optical fiber strain or temperature sensing

Two high resolution optical-fiber system for the distributed measurement of strain or temperature have been investigated. The first is a fully distributed system, based on a high spatial resolution POTDR which benefits from photon-counting detection, with a spatial resolution of 50mm. The second is a novel quasi-distributed system which uses coherent coupling of backscattered light in a high birefringence fiber, and also uses photon counting detection.

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