摘要
介绍了光纤光栅温度测量的原理,描述了光纤光栅感温探测系统的主要组成结构和各模块的功能特点。通过设置不同高度的火源位置及不同的火源功率,在模拟地铁区间隧道中开展了全尺寸火灾试验,研究光纤光栅感温火灾探测系统在隧道内发生火灾时的响应性能,测量隧道拱顶处最高温度以及报警响应时间,并根据光纤光栅传感器的温度变化情况来确定火灾规模。研究发现,在隧道内纵向风速较大时,火焰及烟气会发生倾斜,导致光纤光栅感温火灾探测器报警位置发生变化。讨论了光纤光栅感温火灾探测系统报警阈值的设置和光纤光栅传感器敷设间距的布置。
The temperature measuring principle of fiber Bragg grating is introduced, the main components and the functions of each module in this detection system are described in detail. Then the response performance of the optical fiber grating temperature detector in a subway tunnel fire via a full-scale simulated experiment of different fire positions, and the fire powers at different heights are investigated, the highest temperature of the tunnel vault and the alarm response time are measured. Meanwhile, the scale of fire could be determined according to the rate and scope of the temperature variation of the fiber Bragg grating sensors. It has been found that the flame and smoke could tilt evidently at a high speed tunnel longitudinal wind, leading a change of the alarm position of optical fi- ber grating temperature fire detector. Finally, the alarm threshold and installation space of the fiber Bragg grating sensor are discussed.
出处
《城市轨道交通研究》
北大核心
2012年第9期49-52,共4页
Urban Mass Transit
