电力电缆光纤光栅实时在线测温传感器优化设计

Optimum design of fiber Bragg grating real-time on-line temperature detecting sensor for power cable

开发高压超高压电力电缆光纤光栅温度传感器系统,提出光纤光栅传感机理,建立优化设计框架。通过光纤光栅温度传感器封装结构优化设计,提出片式封装结构;通过线性度优化设计,提出用铝板作为封装基底材料;通过外界应力场影响补偿优化设计,提出采用40 mm×10 mm(长×宽)的小尺寸封装方法。进行光纤光栅温度传感器水域实验和光纤光栅测温系统对比实验,讨论系统的性能和可行性。并将光纤光栅温度实时在线监控系统应用于实际工程项目,分辨率达0.1℃,精确度达±0.5℃,测温范围可达-30～200℃。

Fiber Bragg grating（FBG） temperature sensor system for high and extra high power cable was developed.Starting from theoretical model,FBG sensing mechanism was proposed to establish a framework for optimal design.Bonded encapsulation structure was proposed through the optimum design for the encapsulation structure of FBG temperature sensor.Using aluminum plate was proposed as encapsulating substrate material through the optimum design for linearity.The method of encapsulating with small size of 10 mm×40 mm was proposed through the optimum compensation design for external stress field.Then,water experiment on FBG temperature sensor and comparative experiment on FBG temperature systems were conducted,and the performance and feasibility of the system was discussed.Finally,FBG temperature on-line monitoring system was applied to actual projects,in which the resolution is up to 0.1 ℃,the accuracy reaches ±0.5 ℃,and the temperature range is-30-200 ℃.