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Distributed fiber-optic intrusion sensor system
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DOI：10.1109/JLT.2005.849924.png)
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摘要
En 中文
A distributed sensor system for detecting and locating intruders based on the phase-sensitive optical-time-domain reflectometer (phi-OTDR) is described. The sensing element is a cabled single-mode telecommunications fiber buried along the monitored perimeter. Light pulses from a continuous-wave Er:fiber Fabry-Perot laser with a narrow (approximate to 3 kHz) instantaneous linewidth and low (few kilohertz per second) frequency drift are injected into one end of the fiber, and the backscattered light is monitored with a photodetector. The effect of phase changes resulting from the pressure of the intruder on the ground immediately above the buried fiber are sensed by subtracting a phi-OTDR trace from an earlier stored trace. In laboratory tests with fiber on reels, the effects of localized phase perturbations induced by a piezoelectric fiber stretcher on phi-OTDR traces were observed. In field tests, people walking on the ground above a buried fiber cable induced phase shifts of several-pi radians.
Keyword:
distributed sensor
Er : fiber laser
fiber sensor
intrusion sensor
optical-phase sensor
optical-time-domain reflectometer (OTDR)
perimeter security
期刊
IF:
4.8
论文数:
1.7W
被引数:
3.8W
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