基于光频域反射和互相关算法的分布式振动传感系统

doi:10.3969/j.issn.0255-8297.2020.06.003

Journal of Applied Sciences ›› 2020, Vol. 38 ›› Issue (6): 864-870.doi: 10.3969/j.issn.0255-8297.2020.06.003

• Communication Engineering • Previous Articles

Distributed Vibration Sensing System Based on Optical Frequency Domain Reflectometry and Cross-Correlation Algorithm

LIU Xiao^1,3, CHE Qian^2,3, LI Xinyu^2,3, WEN Hongqiao³

1. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;
2. School of Information Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China;
3. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, Hubei, China

Received:2019-05-15 Published:2020-12-08

Abstract

Abstract: Based on characteristics of Rayleigh scattering light, one can achieve distributed measurements based on the correlation analysis of signals in the optical frequency domain reflectometry (OFDR) system. In this paper, we propose to apply overlapped sliding window in the subsections of signals and choose appropriate weighted function of generalized cross-correlation algorithm through experimental comparison in an OFDR distributed fiber-optic vibration sensing system based on cross-correlation algorithm. Experimental results show that by using the proposed technique, the OFDR performs with an improved positioning accuracy and a reduced false alarm rate. Furthermore, a distributed vibration sensor with the positioning accuracy of 0.247 m and the measurable vibration frequency ranging from 5 kHz to 50 kHz is demonstrated.

Key words: distributed optical fiber sensing, Rayleigh scattering, cross-correlation, sliding window

CLC Number:

O438

LIU Xiao, CHE Qian, LI Xinyu, WEN Hongqiao. Distributed Vibration Sensing System Based on Optical Frequency Domain Reflectometry and Cross-Correlation Algorithm[J]. Journal of Applied Sciences, 2020, 38(6): 864-870.

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Distributed Vibration Sensing System Based on Optical Frequency Domain Reflectometry and Cross-Correlation Algorithm

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