Intrusion detecting and positioning method for distributed optical fiber fence
A distributed optical fiber and intrusion detection technology, applied in the direction of measuring devices, electromagnetic wave re-radiation, radio wave measurement systems, etc., can solve the problems of high false alarm rate and false alarm rate, low signal-to-noise ratio of monitoring signals, and sensitivity to interference, etc. question
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[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0048] see figure 1 , The Φ-OTDR distributed optical fiber fence system consists of three main parts, detection optical cable, light source and signal demodulation equipment, central processing unit, specific equipment and devices required from the system signal process include lasers that generate ultra-narrow coherent pulses And modulators, ordinary single-mode optical fibers buried near the perimeter or underground for sensing external intrusions, optical couplers, photodetectors for detecting optical signals, signal acquisition devices and central processing units; other amplification devices are based on monitoring distance requirements Selection, such as erbium-doped fiber amplifier, Raman amplifier, etc.; in the present invention, the strong coherent light emitted by the narrowband laser is modulated by the modulator to produce narrow p...
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