基于布里渊光时域反射的分布式光纤传感入侵定位检测系统

A Brillouin optical time-domain reflectometer based distributed fiber optic instrusion sensor system

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 fiber optic intrusion sensor system based on Brillouin optical time-domain reflectometer（BOTDR） has been presented.With the application of a single longitudinal mode distributed feedback（DFB） laser and the sideband-pass filter（BPF） technique,the frequency demodulation of the system can be simplified,and the fast detection of the intrusion events can be achieved.The results show that the spatial resolution can reach 5 m with a strain resolution of 200 με in the measuring range of 10 km for this system,which can meet the requirements of the real-time intrusion detection.