Distributed Vibration Sensor Based on Coherent Detection of Phase-OTDR

被引：702
作者：
Lu, Yuelan [1 ]
Zhu, Tao [1 ,2 ]
Chen, Liang [1 ]
Bao, Xiaoyi [1 ]
机构：
[1] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada
[2] Chongqing Univ, Educ Minist China, Key Lab Optoelect Technol & Syst, Chongqing 400044, Peoples R China
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2010年 / 28卷 / 22期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Distributed optical fiber sensor; frequency response; pencil-break; phase-sensitive OTDR; vibration; ACOUSTIC-EMISSION; SYSTEM;
D O I：
10.1109/JLT.2010.2078798
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We developed a distributed vibration sensor by using heterodyne detection and signal processing of moving averaging and moving differential for the phase optical time domain reflectometry system. The broadband acoustic frequency components generated by pencil-break vibration have been measured and identified in location by our distributed vibration sensor for the first time. Pencil break measurement is a standard technique to emulate the acoustic emission of cracks in concrete or steel bridges for early crack identification. The spatial resolution is 5m and the highest frequency response is 1 kHz, which is limited by the trigger frequency of data acquisition card. This new sensing system can be used for vibration detection of health monitoring of various civil structures as well as any dynamic monitoring requirement.
引用
收藏
页码：3243 / 3249
页数：7
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