一种低成本的分布式光纤周界预警系统  

Low-cost Distributed Fiber Optic Sensor for Perimeter Security

作　　者：叶贯宇 江毅[1] YE Guan-yu;JIANG Yi(College of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院,北京100081

出　　处：《仪表技术与传感器》2019年第2期90-93,共4页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(61575021)

摘　　要：为了满足民用领域对周界安防的需求,提出了一种低成本的基于Φ-OTDR(相位敏感型光时域反射计)的分布式周界预警系统。使用内调制的方式产生光脉冲,同步采集和数字平均的方式采集、处理数据,结果表明系统能多点探测,在室内和室外分别达到12 dB和8.5 dB的信噪比。通过FPGA与采样芯片结合,减少了成本,将测量时间降低为0.8 s;通过差值曲线取相对值方法,提高室外环境下信噪比0.78 dB;通过双阈值判断方式将漏报率降低到了8%。To meet the needs of perimeter security in civilian field,a low-cost distributed sensor system based on Φ-OTDR was proposed.The laser pulse was created by internal modulation,the data was acquired and analyzed by synchronous acquisition and digital average.The results show that the system is capable of detecting multiple intrusions with the indoor SNR of 12 dB and outdoor SNR of 8.5 dB.By combining FPGA with sampling chip,the cost lessens and measurement time is reduced to 0.8 s.The relative value of subtraction curve is used to improve outdoor SNR by 0.78 dB and double threshold method is adopted to decrease the missing alarm rate to 8%.

关 键 词：光纤传感器 周界预警 相位敏感型光时域反射计 分布式传感 背向瑞利散射 低成本 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]