8 June 2017 Brillouin Standing Wave Reflectometry (BSWR): a novel approach for high sensitivity, fast and distributed strain sensing in optical fibers
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103239P (2017) https://doi.org/10.1117/12.2276368
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
We demonstrate a novel distributed fiber sensing technique with a record broadband sensitivity of 10nƐ/√Hz at a sampling rate of 1MHz. A standing acoustic wave is generated by all-optical excitation of two simultaneously counter-propagating Brillouin dynamic gratings. A dual-tone readout probe pulse is used for the distributed measurement of strain-induced nonlinear phase-shifts of the acoustic wave. The phase is demodulated in electrical domain from the beat note of the reflected probe following the hardware-simpler direct detection. The measurement of 5kHz strain vibrations with a spatial resolution of 20cm (limited only by the 0.5ns switching time of our SOA) is reported.
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A. Bergman, A. Bergman, M. Tur, M. Tur, } "Brillouin Standing Wave Reflectometry (BSWR): a novel approach for high sensitivity, fast and distributed strain sensing in optical fibers", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103239P (8 June 2017); doi: 10.1117/12.2276368; https://doi.org/10.1117/12.2276368
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