Field test of a distributed fiber-optic intrusion sensor system for long perimeters
Field test of a distributed fiber-optic intrusion sensor system for long perimeters
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DOI：
10.1364/ao.46.001968
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发表时间：
2007-04-10
期刊：
影响因子：
1.9
通讯作者：
Taylor, Henry F.
中科院分区：
文献类型：
--
作者：
Juarez, Juan C.;Taylor, Henry F.
描述了一种基于相敏光时域反射计(Phi-OTDR)的分布式入侵检测和定位传感器系统在沙漠地区的现场测试。传感元件是直径4.5毫米的电缆中的单模电信光纤，埋在填满松散沙子的沟渠中。来自具有窄(~lt；3 kHz)瞬时线宽和低(每秒几千赫兹)频率漂移的连续波法布里-珀罗激光器的光脉冲被注入光纤的一端，并且用独立的接收器监测背向散射光的正交偏振。通过从较早存储的迹线减去Phi-OTDR迹线来感测光学载波中的局部化相位变化。在8.5公里的电缆长度和19公里的总光纤路径上实时实现了对步行入侵者和沿电缆线附近道路行驶的车辆的高灵敏度和一致检测。(C)2007年美国光学学会。
Field tests in desert terrain of a distributed sensor system for detecting and locating intruders based on the phase-sensitive optical-time-domain reflectometer (phi-OTDR) are described. The sensing element is a single-mode telecommunications fiber in a 4.5 mm diameter cable buried in a trench filled with loose sand. Light pulses from a continuous-wave Er:fiber Fabry-Perot laser with a narrow (< 3 kHz) instantaneous linewidth and low (few kilohertz per second) frequency drift are injected into one end of the fiber, and the orthogonal polarizations of the backscattered light are monitored with separate receivers. Localized phase changes in the optical carrier are sensed by subtracting a phi-OTDR trace from an earlier stored trace. High sensitivity and consistent detection of intruders on foot and of vehicles traveling down a road near the cable line was realized over a cable length of 8.5 km and a total fiber path of 19 km in real time. (c) 2007 Optical Society of America.