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Open AccessArticle

Analysis of Phase-Shift Pulse Brillouin Optical Time-Domain Reflectometry

1
Graduate School of Engineering and Science, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan
2
Centre of Advanced Electronic and Communication Engineering (PAKET), Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor 43600, Malaysia
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(7), 1497; https://doi.org/10.3390/s19071497
Received: 17 January 2019 / Revised: 16 February 2019 / Accepted: 22 March 2019 / Published: 27 March 2019
(This article belongs to the Special Issue Distributed Optical Fiber Sensing)
Distributed strain and temperature can be measured by using local Brillouin backscatter in optical fibers based on the strain and temperature dependence of the Brillouin frequency shift. The technique of analyzing the local Brillion backscatter in the time domain is called Brillouin optical time domain reflectometry (BOTDR). Although the best spatial resolution of classic BOTDR remains at around 1 m, some recent BOTDR techniques have attained as high as cm-scale spatial resolution. Our laboratory has proposed and demonstrated a high-spatial-resolution BOTDR called phase-shift pulse BOTDR (PSP-BOTDR), using a pair of probe pulses modulated with binary phase-shift keying. PSP-BOTDR is based on the cross-correlation of Brillouin backscatter and on the subtraction of cross-correlations obtained from the Brillouin scatterings evoked by each phase-modulated probe pulse. Although PSP-BOTDR has attained 20-cm spatial resolution, the spectral analysis method of PSP-BOTDR has not been discussed in detail. This article gives in-depth analysis of the Brillouin backscatter and the correlations of the backscatters of the PSP-BOTDR. Based on the analysis, we propose new spectral analysis methods for PSP-BOTDR. The analysis and experiments show that the proposed methods give better frequency resolution than before. View Full-Text
Keywords: Distributed fiber sensor; strain and temperature sensor; Brillouin scattering; Brillouin Optical Time Domain Reflectometry; signal processing; spectral analysis; fast Fourier transform Distributed fiber sensor; strain and temperature sensor; Brillouin scattering; Brillouin Optical Time Domain Reflectometry; signal processing; spectral analysis; fast Fourier transform
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Horiguchi, T.; Masui, Y.; Zan, M.S.D. Analysis of Phase-Shift Pulse Brillouin Optical Time-Domain Reflectometry. Sensors 2019, 19, 1497.

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