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Review

Recent Advances in Brillouin Optical Time Domain Reflectometry

1
Key Laboratory of Advanced Transducers and Intelligent Control Systems (Ministry of Education and Shanxi Province), Taiyuan University of Technology, Taiyuan 030024, China
2
College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
3
State Key Laboratory of Coal and CBM Co-mining, Shanxi Jincheng Anthracite Mine Group Co., Ltd., Jincheng 048000, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(8), 1862; https://doi.org/10.3390/s19081862
Received: 27 March 2019 / Revised: 12 April 2019 / Accepted: 16 April 2019 / Published: 18 April 2019
(This article belongs to the Section Physical Sensors)
In the past two decades Brillouin-based sensors have emerged as a newly-developed optical fiber sensing technology for distributed temperature and strain measurements. Among these, the Brillouin optical time domain reflectometer (BOTDR) has attracted more and more research attention, because of its exclusive advantages, including single-end access, simple system architecture, easy implementation and widespread field applications. It is realized mainly by injecting optical pulses into the fiber and detecting the Brillouin frequency shift (BFS), which is linearly related to the change of ambient temperature and axial strain of the sensing fiber. In this paper, the authors provide a review of new progress on performance improvement and applications of BOTDR in the last decade. Firstly, the recent advances in improving the performance of BOTDRs are summarized, such as spatial resolution, signal-to-noise ratio and measurement accuracy, measurement speed, cross sensitivity and other properties. Moreover, novel-type optical fibers bring new characteristics to optic fiber sensors, hence we introduce the different Brillouin sensing features of special fibers, mainly covering the plastic optical fiber, photonic crystal fiber, few-mode fiber and other special fibers. Additionally, we present a brief overview of BOTDR application scenarios in many industrial fields and intelligent perception, including structural health monitoring of large-range infrastructure, geological disaster prewarning and other applications. To conclude, we discuss several challenges and prospects in the future development of BOTDRs. View Full-Text
Keywords: distributed optical fiber sensing; BOTDR; spatial resolution; signal-to-noise ratio; cross-sensitivity; novel fiber; BOTDR application distributed optical fiber sensing; BOTDR; spatial resolution; signal-to-noise ratio; cross-sensitivity; novel fiber; BOTDR application
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MDPI and ACS Style

Bai, Q.; Wang, Q.; Wang, D.; Wang, Y.; Gao, Y.; Zhang, H.; Zhang, M.; Jin, B. Recent Advances in Brillouin Optical Time Domain Reflectometry. Sensors 2019, 19, 1862. https://doi.org/10.3390/s19081862

AMA Style

Bai Q, Wang Q, Wang D, Wang Y, Gao Y, Zhang H, Zhang M, Jin B. Recent Advances in Brillouin Optical Time Domain Reflectometry. Sensors. 2019; 19(8):1862. https://doi.org/10.3390/s19081862

Chicago/Turabian Style

Bai, Qing, Qinglin Wang, Dong Wang, Yu Wang, Yan Gao, Hongjuan Zhang, Mingjiang Zhang, and Baoquan Jin. 2019. "Recent Advances in Brillouin Optical Time Domain Reflectometry" Sensors 19, no. 8: 1862. https://doi.org/10.3390/s19081862

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