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提出了一种新的光纤多防区周界传感系统,采用波分复用技术实现了监控防区和通道的扩展。该系统对传统采用单根传感光纤和反射镜的结构作了改进,并扩展了传感光纤的数量,将多根传感光纤分别置于监控领域内的不同防区,每个防区分别用不同中心波长的光纤布拉格光栅作为反射装置,使每根传感光纤工作在不同的波长。利用波分复用器件与技术,多根传感光纤共用一套干涉系统,实现了多个干涉子系统同时、独立的监测。实验结果表明,该系统可以实现多个分散防区同时、独立的入侵检测和定位,信号响应时间小于1ms,不同防区间信号的串扰小于-20dB。
A new optical fiber multi-zone perimeter sensing system is proposed. WDM technology is used to monitor the expansion of zones and channels. The system improves the traditional structure of single sensing fiber and mirror, and expands the number of sensing fibers, placing multiple sensing fibers in different zones within the monitoring area, each with a different A fiber Bragg grating of central wavelength acts as a reflection device, allowing each sensing fiber to operate at a different wavelength. Using WDM devices and technologies, a number of sensing fibers share a common interference system, enabling simultaneous and independent monitoring of multiple interfering subsystems. Experimental results show that the system can detect and locate intrusion at multiple locations simultaneously and independently. The response time of the signal is less than 1ms. The crosstalk between different signals is less than -20dB.