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arXiv · 1609.05698

Brillouin optical time domain reflectometry for fast detection of dynamic strain incorporating double-edge technique

Mingjia Shangguan·Chong Wang·Haiyun Xia·Jiawei Qiu·Guoliang Shentu·Xiankang Dou·Qiang Zhang·Jian-wei Pan
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Abstract

For the first time, a direct detection BOTDR is demonstrated for distributed dynamic strain sensing incorporating double-edge technique, time-division multiplexing technique and upconversion technique. The double edges are realized by using the transmission curve and reflection curve of an all-fiber Fabry-Perot interferometer (FPI). Benefiting from the low loss of the fiber at, the time-division multiplexing technique is performed to realize the double-edge technique by using only a single-channel FPI and only one piece of a detector. In order to detect the weak spontaneous Brillouin backscattering signal efficiently, a fiber-coupled upconversion detector is adopted to upconvert the backscattering signal at 1548.1 nm to 863 nm, which is detected by a Si-APD finally. In the experiment, dynamic strain disturbance up to 1.9mε over 1.5 km of polarization maintaining fiber is detected at a sampling rate of 30 Hz. An accuracy of 30με and spatial resolution of 0.6 m is realized.

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Mingjia Shangguan, Chong Wang, Haiyun Xia, Jiawei Qiu, Guoliang Shentu, Xiankang Dou, Qiang Zhang, Jian-wei Pan. 2016-09-19. Brillouin optical time domain reflectometry for fast detection of dynamic strain incorporating double-edge technique. https://doi.org/10.1016/j.optcom.2017.04.033

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