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Optical Engineering

Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse
Author(s): Tao Liu; Feng Wang; Xuping Zhang; Lin Zhang; Quan Yuan; Yu Liu; Zhijun Yan
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Paper Abstract

A distributed vibration sensing technique using double-optical-pulse based on phase-sensitive optical time-domain reflectometry (ϕ-OTDR) and an ultraweak fiber Bragg grating (UWFBG) array is proposed for the first time. The single-mode sensing fiber is integrated with the UWFBG array that has uniform spatial interval and ultraweak reflectivity. The relatively high reflectivity of the UWFBG, compared with the Rayleigh scattering, gains a high signal-to-noise ratio for the signal, which can make the system achieve the maximum detectable frequency limited by the round-trip time of the probe pulse in fiber. A corresponding experimental ϕ-OTDR system with a 4.5 km sensing fiber integrated with the UWFBG array was setup for the evaluation of the system performance. Distributed vibration sensing is successfully realized with spatial resolution of 50 m. The sensing range of the vibration frequency can cover from 3 Hz to 9 kHz.

Paper Details

Date Published: 19 August 2017
PDF: 7 pages
Opt. Eng. 56(8) 084104 doi: 10.1117/1.OE.56.8.084104
Published in: Optical Engineering Volume 56, Issue 8
Show Author Affiliations
Tao Liu, Nanjing Univ. (China)
Feng Wang, Nanjing Univ. (China)
Xuping Zhang, Nanjing Univ. (China)
Lin Zhang, Aston Univ. (United Kingdom)
Quan Yuan, Nanjing Univ. (China)
Yu Liu, Nanjing Univ. (China)
Zhijun Yan, Huazhong Univ. of Science and Technology (China)

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