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Optical Engineering

Enhanced Φ-OTDR system for quantitative strain measurement based on ultra-weak fiber Bragg grating array
Author(s): Xuping Zhang; Zheng Guo; Yuanyuan Shan; Zhenhong Sun; Siyi Fu; Yixin Zhang
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Paper Abstract

Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has been widely used in various applications for its distributed measurement capability of dynamic disturbance. However, traditional Φ-OTDR cannot realize quantitative measurement of the strain variation introduced by the external disturbance. Recently, an ultra-weak fiber Bragg grating (UWFBG) array-based Φ-OTDR system has been proposed to realize quantitative measurement. Unfortunately, the spatial resolution in this system is not satisfactory, since spatial resolution is equal to UWFBGs interval and the interval cannot be too small. We have proposed an enhanced system to realize quantitative strain measurement and high spatial resolution monitoring by combining ordinary Φ-OTDR system with the UWFBG array-based Φ-OTDR system. Experimental results showed that quantitative strain measurement at the end of a 5-km long sensing fiber could be realized with a spatial resolution of 4 m while the interval between adjacent UWFGBs was 50 m.

Paper Details

Date Published: 9 May 2016
PDF: 6 pages
Opt. Eng. 55(5) 054103 doi: 10.1117/1.OE.55.5.054103
Published in: Optical Engineering Volume 55, Issue 5
Show Author Affiliations
Xuping Zhang, Nanjing Univ. (China)
Zheng Guo, Nanjing Univ. (China)
Yuanyuan Shan, Nanjing Univ. (China)
Zhenhong Sun, Nanjing Univ. (China)
Siyi Fu, Nanjing Univ. (China)
Yixin Zhang, Nanjing Univ. (China)

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