基于光纤光栅的智能化周界入侵预警系统研究

FBG-based Study on Invasion of Intelligent Perimeter into Early Warning System

系统利用光纤光栅振动传感器能够串并联复用的特性进行组网,实现大范围环境感知和精确定位,通过对时变波长信号进行短时频谱分析提取行为特征参量,再利用多传感器联合响应时的行为相关性判据,准确地对入侵位置进行判断,实现了高灵敏度和低误报率。多个工程应用案例表明该光纤光栅周界入侵报警系统具有模式识别功能,对风雨等气象因素不敏感,报警准确率为100%,响应时间小于3 s,空间定位精度小于10 m。

The system can fulfill network organization according to the characteristic of series-parallel con- nection and reuse by advantage of FBG vibrating sen- sor, realize the large-scale environmental perception and precise positioning; the behavior characteristic parameter is extracted by starting the analysis on short-time frequency spectrum of changing wave- length signal and the invasion position is precisely judged according to the behavioral relevance basis at the time of the unified response of many sensors, thus the high sensitivity and low false alarm rate is achieved. Many engineering application cases indi- cate that this FBG perimeter invasion alarm system has pattern recognition function, is not sensitive to the meteorological factors such as wind and rain. Its alarm accuracy rate is 100%; the response time is less than 3 s and spatial positioning accuracy is less than 10 m.