基于模间干涉的全光纤电压传感器设计  

Design of All-Fiber Voltage Sensor Based on Intermode Interference

作　　者：王河林[1] 毕卫红[1] 杨爱军[2] 高迎霞[1] 王磊[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北省秦皇岛市066004 [2]河北师范大学数信学院,河北省石家庄市050016

出　　处：《电网技术》2006年第24期50-55,共6页Power System Technology

基　　金：国家自然科学基金资助项目(50477001)。~~

摘　　要：介绍了一种新型的光纤电压传感器结构和工作原理,分析了系统中椭圆芯双模光纤的传输模式和模间相干光斑的变化,采用熔接的方式进行相干光接收来获得正交相位漂移信号,根据模间群折射率差与光程差的关系设计调整光纤的长度,依据石英晶体和空气的绝缘强度进行传感光纤匝数设计,讨论了含源零差探测法的相位跟踪原理,给出了相位检测框架图及实验结果,分析表明该设计方案能达到相位跟踪的目的。The structure and principle of a new type of optical fiber voltage sensor are presented. The transmission mode of dual mode optical fiber with elliptical cores in measurement system and the variation of intermode coherent light spot are analyzed, Through the reception of coherent light by means of fusing splice, the orthogonal phase shifting signal is obtained. According to the relation between intermode group refraction index difference and optical path difference the length of optical fiber is designed and adjusted, and according to the insulating strength of both quartz crystal and air the turns of optical fiber are ascertained. The phase tracking principle of source-contained homodyne detection is researched, the frame diagram for phase detection and experimental results are given. Analysis results make it clear that the proposed all-fiber voltage sensor can implement phase tracking.

关 键 词：模间干涉 全光纤电压传感器 群折射率 光程差 相位跟踪 灵敏度 

分 类 号：TM451.7[电气工程—电器]