直线型、螺线管嵌套型及多光路反射式光纤电流传感器结构设计与仿真  

Structure Design and Simulation Study on Line,Solenoids Nested and Mutiple-reflection Optical Channels Type Optical Fiber Current Sensor

作　　者：万代[1] 钟力生[1] 于钦学[1] 陈楠[1] George Chen 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]南安普顿大学计算机与电子科学学院

出　　处：《高电压技术》2013年第11期2678-2685,共8页High Voltage Engineering

摘　　要：小信号测量领域特别是局部放电检测中,全光纤电流传感器在灵敏度方面存在较大问题,针对该问题进行了研究。首先给出了光纤模型中Faraday旋光效应的经典理论解释,并对折射率表达式进行了修正,在此基础上设计了传统直线型、螺线管嵌套型和多光路反射式等3种光纤电流传感器结构。然后使用COMSOL多模场耦合仿真软件对所设计的3种光纤传感系统的传输场进行了计算仿真和对比分析,结果表明螺线管嵌套型全光纤电流传感器和多光路反射式光纤电流传感器的灵敏度分别比传统直线型光纤电流传感器高1 000倍和600倍以上。最后对所设计的2种新型传感器性能关系进行了分析,结果表明螺线管嵌套型光纤电流传感器加工精度要求不高,传感光纤的安装位置对测试结果影响不大;多光路反射式光纤电流传感器加工精度要求很高,传感头的安装位置对测试结果影响不大。综上所述2种新型传感器均使灵敏度得到极大改善,且在实验测试中即使传感头位置变化对测试结果也影响不大。未来将依据所设计的系统对传感器的潜在应用进行进一步的实验研究。In small current measurements, especially in partial discharge detections, optical fiber current sensors （OFCS） have certain shortage in sensitivity, it is studied in this paper. After demonstrating the Faraday rotation effect, we modified the expression of refractive index, and designed three structures of OFCS, namely conventional line type, solenoids nested full （SNF） type, and mutiple-reflection optical channels （MROC） type. Moreover, using the software COMSOL, we simulated and compared transmission fields of systems using OFCS of the tree types. The results show that the sensitivities of SNF OFCS and MROC OFCS are about 1 000 times and 6 00 times bigger than those of the conventional OFCS. The performances of the novel kinds of OFCS are further analyzed. SNF OFCS requires relatively low machining accuracy, and its performance is barely affected by the installation site of sensing fibers. Meanwhile, MORC OFCS is also barely affected by the installation site of sensing fibers, but it requires very high machining accuracy. In conclusion, the two novel OFCS boost the sensitivity significantly, and show great tolerance of sensing fibers＇ installation.

关 键 词：光纤 传感头 Faraday旋光效应 光纤电流传感器 结构设计 灵敏度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]