一种分布式光纤光栅电缆温度传感器

Distributed temperature sensor based on fiber grating of cable

提出了一种新型分布式光纤光栅温度监测系统,可以实现电缆温度的实时在线监测。基于热传导方程和边界条件的基础上,采用有限元法对电缆温度场进行了分析,为监测电缆温度提供了理论依据。光纤光栅本身不带电,抗辐射和电磁干扰能力强,耐高压和腐蚀,非常适合用做高压电力环境中的温度传感器。通过光纤光栅的温度特性实验,在20－100℃的温度范围内,光纤光栅的中心波长随温度变化呈良好的线性,线性度达到99.8%。通过对标准的热电偶温度传感器与光纤光栅温度传感器的对比实验,表明该系统测量时间-温度变化曲线跟随性好,温度差均小于1℃,符合电力电缆温度状态在线监测的使用要求。

A distributed temperature sensor based on fiber grating of cable is presented in this paper.It can monitor temperature of cable real-time.Based on equation of heat conduction,finite-element method is used to analyze temperature field of cable and provides witness for monitor temperature.The fiber grating is not electrification,has good ability of anti-jamming and radioresistance,it is suit to as the temperature sensor in high-tension electricity environment.In 20～100 ℃,the central wavelength of FBG vary with the temperature has fine linearity.The standard thermojunction temperature sensor and fiber grating temperature sensor are used to do contrast experiment.The experiment result indicates that the curve of time-temperature has good follow character and temperature difference less than 1 ℃.So it can accurately measure temperature of cable.