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Open AccessArticle

Ultra-Long-Distance Hybrid BOTDA/Ф-OTDR

1
Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education), University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China
2
Center for Information Geoscience, UESTC, Chengdu 611731, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(4), 976; https://doi.org/10.3390/s18040976
Received: 18 February 2018 / Revised: 22 March 2018 / Accepted: 23 March 2018 / Published: 25 March 2018
(This article belongs to the Section Physical Sensors)
In the distributed optical fiber sensing (DOFS) domain, simultaneous measurement of vibration and temperature/strain based on Rayleigh scattering and Brillouin scattering in fiber could have wide applications. However, there are certain challenges for the case of ultra-long sensing range, including the interplay of different scattering mechanisms, the interaction of two types of sensing signals, and the competition of pump power. In this paper, a hybrid DOFS system, which can simultaneously measure temperature/strain and vibration over 150 km, is elaborately designed via integrating the Brillouin optical time-domain analyzer (BOTDA) and phase-sensitive optical time-domain reflectometry (Ф-OTDR). Distributed Raman and Brillouin amplifications, frequency division multiplexing (FDM), wavelength division multiplexing (WDM), and time division multiplexing (TDM) are delicately fused to accommodate ultra-long-distance BOTDA and Ф-OTDR. Consequently, the sensing range of the hybrid system is 150.62 km, and the spatial resolution of BOTDA and Ф-OTDR are 9 m and 30 m, respectively. The measurement uncertainty of the BOTDA is ± 0.82 MHz. To the best of our knowledge, this is the first time that such hybrid DOFS is realized with a hundred-kilometer length scale. View Full-Text
Keywords: fiber optics sensors; optical time domain reflectometry; Rayleigh scattering; stimulated Brillouin scattering; optical amplifiers fiber optics sensors; optical time domain reflectometry; Rayleigh scattering; stimulated Brillouin scattering; optical amplifiers
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Fu, Y.; Wang, Z.; Zhu, R.; Xue, N.; Jiang, J.; Lu, C.; Zhang, B.; Yang, L.; Atubga, D.; Rao, Y. Ultra-Long-Distance Hybrid BOTDA/Ф-OTDR. Sensors 2018, 18, 976.

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