基于光纤光栅的火灾报警技术的研究

Research on Fire Alarm Technology Based on Fiber Bragg Grating

隧道发生火灾时准确及时地报警具有十分重要的意义。利用FDS软件从汽车尺寸、环境温度及火源功率等方面,研究火灾时隧道顶棚温升与风速的关系,得到合理的动态报警阈值。制作缩尺隧道模型,搭建光纤光栅测温系统,进行实验室模拟实验,确定了测量误差不超过0.7℃,并验证了固定阈值与动态阈值相结合的火灾报警策略的可行性,很好地解决了火灾常规固定阈值法漏报的问题。

It is a great significance to accurately and timely report a tunnel fire.Using FDS software to study the relationship between the temperature rise of the tunnel ceiling and the wind speed from the aspects of vehicle size,ambient temperature and fire source power,a reasonable dynamic alarm threshold is obtained.The scale tunnel model is made;the fiber grating temperature measurement system is built;the laboratory simulation experiment is carried out;the measurement error is determined to not exceed 0.7?C;and the false report problem of fire routine fixed threshold method is solved.