分布式光纤测温系统监测地铁火灾的试验研究

Test of Distributed Optical Fiber Temperature Measurement System in Subway Fire Monitoring

介绍了分布式光纤温度测量原理,详细描述了分布式光纤测温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以及不同的火源功率,在模拟地铁区间隧道中开展全尺寸火灾试验,研究分布式光纤测温系统在地铁区间隧道内发生火灾时的温度响应性能,测量隧道拱顶处最高温度分布,并根据温度变化情况来讨论火灾发生的规模和火灾探测器的报警阈值。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,导致分布式感温火灾探测器报警位置发生变化。最后,对分布式光纤测温系统中感温光纤在地铁区间隧道内敷设高度进行了讨论。

he principle of the distributed optical fiber tem- perature measurement system （DOFTM） is introduce, the main structural characteristics, the functions and features of these modules are described in detail. A full-scale experi- ment is carried out in a simulated subway tunnel with dif- ferent fire source locations and fire powers, the tempera- ture- response characteristics of DOFTM is studied, the temperature distributions are measured. The scale of sub- way fires, the alarm threshold values of fire detector are discussed according to the variation of temperature. In addi- tion, the flame and smoke inclined with high longitudinal ventilation velocity is observed, and resulted in the position changes of alarming devices. Finally, the installation height of fiber optic in subway tunnels is discussed.