30km分布光纤温度传感器的空间分辨率研究

Reseach on Spatial Resolution of the 30km Distributed Optical Fiber Temperature Sensor

分布光纤温度传感器是一种比较新型的传感器系统,它可以实时测量空间温度场的分布。空间分辨率是分布光纤温度传感器的一个重要参数。在30km分布光纤温度传感器系统的研制过程中,对系统的空间分辨率进行了优化设计。入射激光脉冲的宽度决定了系统空间分辨率的上限。光电接收系统和电系统的带宽也会影响系统的空间分辨率。电系统的带宽必须和激光脉冲的宽度相匹配。系统的空间分辨率既可以直接测量,也可以通过测量光纤末端菲涅尔反射的半宽度来间接测量。经过优化设计,在30km的系统中,空间分辨率达到了3m。

The distributed optical fiber temperature sensor is a new type of sensor system which can measure the spatial distribution of temperature real timely. The spatial resolution is an important parameter of the distributed optical fiber sensor. The spatial resolution of the 30km distributed optical fiber sensor is optimized. The upper limit of the spatial resolution of the system is determined by the width of the input laser pulse. The bandwidth of optoelectronic receiving system and the electronic system also affect the spatial resolution of the system. The bandwidth of the electronic system shall be matched with the pulse width of the laser. The spatial resolution of system can be measured directly or evaluated indirectly by the half width of the Fresnel reflection at the end of the fiber. The spatial resolution of the system reached 3m after the optimization.