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建立了基于布里渊时域反射(BOTDR)技术的分布式光纤传感入侵定位检测系统。采用自制的光纤单纵模分布反馈(DFB)激光器,利用边缘滤波(BPF)技术,简化了BOTDR系统中频率解调的方法,实现了对入侵应变事件的快速定位与检测。实验结果表明,当探测范围为10km时,系统的定位空间分辨率达到5m,应变分辨率达到200με,可以满足入侵定位实时检测的需求。
A distributed optical fiber sensor intrusion detection system based on Brillouin time domain reflectometry (BOTDR) is proposed. The self-made fiber single-longitudinal mode distributed feedback (DFB) laser is used to simplify the frequency demodulation in BOTDR system by using the edge filtering (BPF) technology, which can realize the rapid localization and detection of intrusion strain events. Experimental results show that when the detection range is 10km, the system can achieve the spatial resolution of 5m and the strain resolution of 200με, which can meet the real-time detection requirements of intrusion location.