多防区光纤周界安防系统及入侵快速判定算法  

Multi-area optical perimeter security system with quick invasion judgement algorithm

作　　者：刘琨[1] 柴天娇 刘铁根[1] 江俊峰[1] 陈沁楠[1] 潘亮[1] 马春宇[1] 何畅[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院、光电信息技术教育部重点实验室,天津300072

出　　处：《光电子．激光》2015年第2期288-294,共7页Journal of Optoelectronics·Laser

基　　金：国家重点基础研究发展计划(2010CB327806);国家自然科学基金(61475114、61227011、61378043、11004150、61108070);国家重大科学仪器设备开发专项(2013YQ030915);天津市科技支撑计划重点项目(11ZCKFGX01900);教育部科学技术重大项目(313038)资助项目

摘　　要：基于迈克尔逊干涉仪,利用法拉第旋光反射镜克服偏振诱导信号衰落,同时结合现场可编程逻辑门阵列(FPGA),设计开发了多防区光纤周界安防系统,实现了对多个防区同时进行独立监控。系统结构简单,成本低廉,可扩展性强。从入侵和环境噪声引起的扰动信号的时域特征出发,提取了每帧信号的过门限率、一组信号的报警帧个数和一组信号最大值和最小值的比值差异系数3个特征参量,进而提出了入侵快速判定算法,降低了系统由于外界轻微扰动、风雨等环境因素导致的误报,提高了系统的准确性和实时性,以期实现快速准确判断外界是否存在入侵扰动的目的。实验结果表明,系统报警准确率为90%,漏报率低于2%。In this paper,a new multi-area optical perimeter security system based on Michelson interfer- ometer is proposed, combining with the advantage of field programmable gate array （FPGA） and utilizing Faraday rotation mirror to overcome polarization induction signal fading. The system can monitor a lot of areas independently at the same time. The structure of the system is simple with low cost. It also has high scalability. In order to identify the invasion signal efficiently and quickly, we extract three character- istics of signal based on the invasion and environmental noise vibration features on time-domain. They are the threshold-crossing rate of each frame of signal,the number of alarm frames of each group of signals and the coefficient of variation of the ratio between the maximum and minimum values of signal of each group, respectively. Then we propose the method of quick decision of invasion on this basis. It can realize the purpose of identifying the invasion signals effectively,improving the accuracy and real-time perform- ance,with reducing the false alarm rate as a result of environmental noises, such as external slight dis- turbance,wind and rain. The experiment results show that the system/s correction alarm rate reaches 90 % and the failure rate is under 2 %.

关 键 词：光纤传感 迈克尔逊干涉 多防区监控 时域特征 

分 类 号：TN247[电子电信—物理电子学]