30 November 2012 Discrete multi-target on-off states detection and location with optical fiber sensing system
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We present an optical fiber sensing system for discrete multi-target’s on-off states detection and location. The sensing system consists of multiple cascaded 1x2 fiber couplers (FCs). Each FC is connected to a reflective optical switch sensor (ROSS). A ROSS is corresponding to a target to be detected. The system can remotely detect the on-off states of multiple ROSSs, as well as accurately and rapidly locate the ROSSs in alarm states. By detecting the various intensities of light pulses reflected by each ROSS, their on-off states can be monitored. The ROSSs in alarm states can be located by directly measuring the reflected light pulse intensity at corresponding time axis or the declined peaks of short-time crosscorrelation of reflection pulse train during adjacent optical pulse period in noisy case. The simulation results with the same and different ROSS intervals show that the detection and location methods proposed are feasible and effective. The system can be used to detect and locate different kinds of physical and chemical targets discretely distributed at the same time, which can prompt state changes of the ROSSs. Although the proposed system is similar to the optical time domain reflectometry (OTDR) in structure, it has better real time performance and lower cost than OTDR.
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Nian Fang, Lutang Wang, Zhaoming Huang, Chen Liu, "Discrete multi-target on-off states detection and location with optical fiber sensing system", Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 85611F (30 November 2012); doi: 10.1117/12.999985; https://doi.org/10.1117/12.999985

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