Distributed optical fiber sensing system based of Rayleigh scattering light φ-OTDR using single-mode fiber laser with high power and narrow linewidth

被引：0
作者：
Key Laboratory of Broadband Optical Fiber Transmission and Communication Networks, University of Electronics Science and Technology of China, Chengdu 610054, China [1 ]
不详 [2 ]
机构：
[1] Key Laboratory of Broadband Optical Fiber Transmission and Communication Networks, University of Electronics Science and Technology of China
[2] Key Laboratory of Opto-Electronic Technology and Systems, Chongqing University
来源：
Guangxue Xuebao | 2008年 / 3卷 / 569-572期
关键词：
Distributed fiber-optic sensor; Fiber optics; Intrusion sensing; Optical-time-domain-reflectometer; Phase-sensitive optical-time-domain-reflectometer (φ-OTDR);
D O I：
10.3788/AOS20082803.0569
中图分类号：
学科分类号：
摘要：
A phase-sensitive optical-time-domain-reflectometer (φ-OTDR) using a fiber laser with high power and narrow linewidth is described. The sensing element is a single-mode telecommunication fiber cable with a 3 mm diameter buried outdoors. The phase changes of Rayleigh scattering light resulting from the pressure (vibration) of the intruder on the ground immediately above or near tile buried fiber. By subtracting a present φ-OTDR trace signal from an earlier one with a time difference of 0.1 s, the system can locate the intrusion point where the optical intensity will change for the reason of interference. By processing the returned signal properly, a distance range of 14 km can be reached, with the best spatial resolution of -50 m reported to date, and a signal-to-noise ratio of -12 dB, to the best of our knowledge. Such a distributed sensing system is anticipated to be used widely in safety monitoring of military bases, national boarders, nuclear facilities, electrical power generation stations, jails, et al.
引用
收藏
页码：569 / 572
页数：3
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