Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse


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.

Publication DOI:
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: Tao Liu, Feng Wang, Xuping Zhang, Lin Zhang, Quan Yuan, Yu Liu, Zhijun Yan, "Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse," Optical Engineering 56(8), 084104 (19 August 2017). Copyright 2017 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. DOI:
Uncontrolled Keywords: optical fiber sensors,optical time-domain reflectometry,ultraweak fiber Bragg grating,vibration measurement,Atomic and Molecular Physics, and Optics,Engineering(all)
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-08-19
Accepted Date: 2017-07-27
Authors: Liu, Tao
Wang, Feng
Zhang, Xuping
Zhang, Lin ( 0000-0002-1691-5577)
Yuan, Quan
Liu, Yu
Yan, Zhijun



Version: Published Version

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