分布式光纤光缆测温的现场影响因素研究  

Research on Field Influence Factors of Distributed Optical Fiber for Optical Cable Temperature Measurement

作　　者：杨晓辉 周阳 刘懿莹[2] 张逸凡 YANG Xiao-hui;ZHOU Yang;LIU Yi-ying;ZHANG Yi-fan(Electric Power Research Institute,State Grid Henan Electric Power Company,Zhengzhou 450052,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网河南省电力公司电力科学研究院,郑州450052 [2]西安交通大学电气工程学院,西安710049

出　　处：《光通信研究》2020年第2期36-39,66,共5页Study on Optical Communications

基　　金：国网河南省电力公司电力科学研究院科技项目资助项目(SGHADKOOPJJS1900173);陕西省自然科学基础研究计划资助项目(2019JM-479)。

摘　　要：文章针对基于拉曼散射的分布式光纤测温系统(DTS)实际应用于监测光缆温度过程中可能对测温结果产生影响的几种因素进行了研究,并为如何提高DTS在实际监测光缆温度过程中的精度提供了可行性建议。首先,对裸纤和光缆测温进行了对比实验,实验结果表明,若将裸纤获得的定标参数直接用于现场光缆,会导致在同样的温度下,光缆和裸纤测温结果之间总是存在一定的差值,因此可通过对裸纤定标参数修正或光缆直接定标获得更高测温精度;其次,对架空光缆在实际工况下存在的弧垂和振动对测温精度影响进行了研究,实验结果表明,弧垂和振动对测温精度的影响较小,但相比于振动,弧垂对测温结果的影响更大,即光缆的动态应变比静态应变对测温影响更明显。This paper mainly studies several factors, which may affect the temperature measurement result when the Distributed Optical Fiber Temperature Sensor System(DTS) based on Raman scattering is used to monitor the cable temperature, and provides some feasible suggestions on how to improve the accuracy of DTS in temperature measurement under the actual monitoring. Firstly, the comparative experiment is developed by measuring the temperature of bare fiber and optical cable using the DTS at the same time. The result shows that if the calibration parameters obtained by bare fiber are directly applied to the optical cable in the field, the measured temperatures of optical cable and bare fiber are different. Therefore, higher temperature accuracy can be obtained by correcting the bare fiber calibration parameters or directly using the optical cable for calibration. Secondly, the influence of the sag and vibration of the aerial optical cable under the actual working conditions on the temperature measurement accuracy is investigated by experiment, and the result shows that the influence of sag and vibration on the temperature measurement accuracy is small. While compared with vibration, the influence of sag on the temperature measurement result is more obvious, which means that the influence on the temperature measurement result by the dynamic strain of the cable is more obvious than that by the static strain of the cable.

关 键 词：分布式光纤测温系统 拉曼散射 光缆 定标参数 弧垂 振动 

分 类 号：TN818[电子电信—信息与通信工程]