基于保偏光纤螺旋长周期光栅的高灵敏度光纤电流传感器  

High sensitivity fiber current sensor based on helical long-period gratings written in polarization-maintaining fiber

作　　者：申绘欣 姜晨 刘云启 SHEN Huixin;JIANG Chen;LIU Yunqi(School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学通信与信息工程学院

出　　处：《光通信技术》2019年第10期1-4,共4页Optical Communication Technology

基　　金：国家自然科学基金（61875117）资助

摘　　要：由于对电流检测大都采用原始的电磁式技术,存在频率窄、磁饱和和动态范围小等电磁式电流传感器一直无法解决的问题,提出了一种基于二氧化碳激光写入保偏光纤(PMF)螺旋长周期光栅(HLPG)的高灵敏度光纤电流传感器。通过从偏振光的3个参数重点研究了椭圆偏振光在光栅中传输时影响其法拉第偏转角度的关键因素。实验结果表明:该光栅的电流灵敏度高达9.22°/A(0.427°/mT)。该传感器具有结构紧凑、制作简单、操作方便和电流灵敏度高等优点。Because the original electromagnetic current technology is mostly used for current detection,there are some problems that cannot be solved by electromagnetic current sensor such as narrow frequency,magnetic saturation and small dynamic range.A high sensitivity current sensor based on carbon dioxide laser writing polarization maintaining fiber(PMF)helical long-period grating(HLPG)is proposed.The key factors affecting Faraday deflection angle of elliptically polarized light propagating in gratings are studied from three parameters of polarized light.The experimental results show that the current sensitivity of the HLPG is as high as 9.22°/A(0.427°/mT).The sensor has the advantages of compactness,simple fabrication,easy operation and high current sensitivity.

关 键 词：保偏光纤 螺旋长周期光栅 法拉第效应 电流传感 

分 类 号：TM452.94+94[电气工程—电器] TN256[电子电信—物理电子学]