Phase sensitive distributed vibration sensing using double-pulse for ultra-weak FBG array

Tao Liu, Feng Wang, Ling Zhou, Xuping Zhang, Lin Zhang

Research output: Chapter in Book/Report/Conference proceedingConference publication

Abstract

A distributed vibration sensing technique using double optical pulse based on phase-sensitive optical time-domain reflectometry (Φ-OTDR) and ultra-weak FBG (UWFBG) array is proposed for the first time. The single mode sensing fiber is integrated with UWFBG array which has uniform spatial interval and ultra-weak reflectivity. The relatively high reflectivity of the UWFBG, compared with the Rayleigh backscattering(RBS), gains a high SNR 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 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.

Original languageEnglish
Title of host publication2017 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2017
PublisherIEEE
Pages1-3
Number of pages3
ISBN (Electronic)9781509062904
DOIs
Publication statusPublished - 22 Nov 2017
Event2017 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2017 - Singapore, Singapore
Duration: 31 Jul 20174 Aug 2017

Conference

Conference2017 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2017
CountrySingapore
CitySingapore
Period31/07/174/08/17

Keywords

  • Optical fiber interference
  • Optical fiber sensors
  • Optical time domain reflectometry
  • Ultra-weak FBG
  • Vibration measurement

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