一种基于径向偏振解调的线性光学电流传感器  

A linear optical current transducer based on radial polarization demodulation

作　　者：谭巧[1,2] 徐启峰 黄奕钒[1] 项宇锴 Tan Qiao;Xu Qifeng;Huang Yifan;Xiang Yukai(College of Electric Engineering and Automation,Fuzhou University,Fuzhou 350108,China;Computer Science,Minjiang University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108 [2]闽江学院计算机科学系,福建福州350108

出　　处：《红外与激光工程》2018年第2期196-201,共6页Infrared and Laser Engineering

摘　　要：提出了一种基于径向偏振解调的线性光学电流传感器。采用集磁式传感头,由两块导磁板将气隙磁场引出,直通式光路由通光孔经过气隙磁场,不需要反射棱镜,根除了反射相移,有利于改善传感器的稳定性。采用径向偏振光栅将法拉第旋转角转换为环形光斑的同步转动,由四象限探测器对光斑定位得到待测电流。经理论分析和实验验证,传感器的测量模式与光强无关,法拉第旋转角测量范围为±43°,测量准确度0.2S级。A linear optical current transducer(OCT)based on radial polarization demodulation was proposed.A magnetic concentration ring with an air gap was selected as the sensing head,in which two magnetizer plates were used to lead out the magnetic field of air gap,and the straight optical path passed through the air gap by light apertures.The reflecting prism was not needed so that the reflection-induced retardation was eliminated,which helped to improve the stability of the transducer.A radially polarized grating was employed to convert the Faraday rotation angle into the rotation of a circular facula,which was detected by a four-quadrant detector,and then the measured current could be obtained after signal processing.The theoretical analysis and experimental results show that this new OCT has a measurement range of±43°in Faraday rotation angle and the advantage of optical power independent,meeting the national standard of 0.2S accuracy class.

关 键 词：光学电流传感器 直通光路 法拉第旋转角 四象限探测器 偏振光栅 

分 类 号：O432.2[机械工程—光学工程]