全同FBG振动传感器在周界安防系统中的应用

为了解决在周界安防系统中基于FBG振动传感器波分复用方式下传感单元数量受光源带宽和解调限制的问题,同时也为了延长周界安防距离、降低系统成本、提高系统效率,提出了"全同光纤布喇格光栅(FBG)振动传感器"的概念,论述了全同FBG振动传感器在周界安防系统中应用的可行性,设计了实验方案,搭建了试验装置并给出了实验结果。实验证明,两个波长基本相同的全同FBG振动传感器接入后的波长灵敏度会有不同程度的损失,实验中6种组合12种连接方式波长灵敏度大于20pm的有10种,实践证明,经过筛选可以达到实际应用的要求,全同FBG振动传感器在周界系统的应用不但可以提高系统的容量,而且使FBG周界系统的成本大大降低,更具市场竞争力。

Identical FBG Vibration Sensor for Perimeter Security System

For perimeter security systems based on traditional FBG wavelength division multiplexing (WDM), the sensing units are limited by light bandwidth and demodulation, so a concept of identical FBG vibration sensor is proposed, meanwhile the problems of security distance, system cost and efficiency are solved at some extent. The application feasibility of the proposed concept in perimeter security systems is discussed, and the experimental programs are designed. Experimental results show that, there will be varying degrees of wavelength sensitivity loss after the access of two identical FBG vibration sensors with the same wavelength. For the 12 kinds of connections, the wavelength sensitivity of which 10 is greater than 20pm. The identical FBG vibration sensor can not only improve the capacity of the system, but also make the FBG perimeter systems greatly reduce the cost and improve market competitiveness.