Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)
- 2004.08c
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- Pages.876-879
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- 2004
Coherent fiber-optic intrusion sensor for long perimeters monitoring
- Choi Kyoo Nam (Dept of Information Communication Engineering, Incheon City College)
- Published : 2004.08.01
Abstract
The buried fiber optic cable as a distributed intrusion sensor for detecting and locating intruders along the long perimeters is proposed. Phase changes resulting from either the pressure of the intruder on the ground immediately above the buried fiber or from seismic disturbances in the vicinity are sensed by a phase-sensitive optical time-domain reflectometer. Light pulses from a Er:fiber cw laser with a narrow, <3kHz-range, spectral width and a frequency drift of < 1 MHz/min are injected into one end of the fiber, and the backscattered light from the fiber is monitored with a photodetector. Results of preliminary studies, measurement of phase changes produced by pressure and seismic disturbances in buried fiber optic cables and simulation of
Keywords
- Coherent sensor;
- intrusion sensor;
- fiber sensor;
- distributed sensor;
- phase sensitive sensor;
- Er-fiber laser