基于不可分辨关系的光纤光栅式火灾探测系统

Fiber Grating Fire Detector Based on Indiscernible Relation

光纤光栅式火灾探测现场工作环境复杂,包含了复杂的海量数据信息。以粗糙集理论中的不可分辨关系作为基础,利用反射光波长(λ1,λ2,…,λn)的差异,将具有复杂性和不确定性的反射光波长作为一个知识系统,火灾探测系统依据光栅的波长(λ1,λ2,…,λn)将探测区域分类为多个防火分区。每一个波长对应的防火分区内设置许多监测点,监测到的光纤光栅的反射波长就是该区域所对应的设定波长。如果监测到的波长λi发生变化,就表明其所对应防火分区的温度发生了改变,一旦温度超出了设定温度值,报警器就会通过数据库传输给客户端,发出相应的"报警"的信号。通过这种方法,大大增加了系统的测量距离和测量精度,测量效果优于传统方法。

The field work environment of fiber grating fire detector is very complex, contai- ning complex mass data information. On the basis of indiscernible relation of the rough set theory, the difference of reflected （λ1,λ2,…,λn） was used to build a knowledge system of reflected light wave length with complexity and uncertainty. Search coverages were divided into many fire compartments base on light wave length （λ1,λ2,…,λn） by fire detector. And many test points were established in each fire compartment. The fiber grating reflection wave length detected in the test point monitors was the corresponding wave length of fire compartment. The change in the wavelength 2,i detected by system would indicate the change in the temperature of corresponding fire compartment. If detected temperature surpassed the setting value, system would immediately report to the police the concrete district position. Through this method, measuring distance and accuracy are improved; the detection effect is better than that of conventional system.