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Sensors 2016, 16(12), 2156; doi:10.3390/s16122156

Bi-Directional Brillouin Optical Time Domain Analyzer System for Long Range Distributed Sensing

1
Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
2
Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, China
3
Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 23 October 2016 / Revised: 13 December 2016 / Accepted: 13 December 2016 / Published: 16 December 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1723 KB, uploaded 16 December 2016]   |  

Abstract

We propose and experimentally demonstrate a novel scheme of bi-directional Brillouin time domain analyzer (BD-BOTDA) to extend the sensing range. By deploying two pump-probe pairs at two different wavelengths, the Brillouin frequency shift (BFS) distribution over each half of the whole fiber can be obtained with the simultaneous detection of Brillouin signals in both channels. Compared to the conventional unidirectional BOTDA system of the same sensing range, the proposed BD-BOTDA scheme enables distributed sensing with a performance level comparable to the conventional one with half of the sensing range and a spatial resolution of 2 m, while maintaining the Brillouin signal-to-noise ratio (SNR) and the BFS uncertainty. Based on this technique, we have achieved distributed temperature sensing with a measurement range of 81.9 km fiber at a spatial resolution of 2 m and BFS uncertainty of ~0.44 MHz without introducing any complicated components or schemes. View Full-Text
Keywords: fiber optics sensors; Brillouin scattering; temperature; optical time domain analyzer fiber optics sensors; Brillouin scattering; temperature; optical time domain analyzer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Guo, N.; Wang, L.; Wang, J.; Jin, C.; Tam, H.-Y.; Zhang, A.P.; Lu, C. Bi-Directional Brillouin Optical Time Domain Analyzer System for Long Range Distributed Sensing. Sensors 2016, 16, 2156.

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