基于光纤迈克耳孙干涉仪调解技术的光纤光栅电流传感技术研究  

Research on Current Sensing Technology Using Fiber Bragg Grating Demodulated by Fiber Michelson Interferometer

作　　者：樊彦恩[1] 武帅[1] 贺胜男[1] 李丹丹[1] 王凯[1] 陈信伟[1] 

机构地区：[1]中国电子科技集团第三十八研究所,安徽合肥230088

出　　处：《激光与光电子学进展》2015年第8期96-101,共6页Laser & Optoelectronics Progress

基　　金：安徽省科技攻关项目(1206c0805001);国防计量技术基础科研项目(JSJC2013210C042)

摘　　要：将光纤布拉格光栅(FBG)粘贴在超磁致伸缩材料(GMM)上,两端加永磁体材料建立偏置磁场以确定系统静态磁场工作点,采用环氧树脂密封绝缘,放置在电流形成的磁场中,构成光纤电流传感器。利用光纤迈克耳孙干涉仪线性边带对光纤光栅交变应变解调,实现了对交流电流信号的检测。实验测得,在传感器线性输出范围内,可探测到的最大线性电流幅值为1700 A,传感系统电平/电流灵敏度为0.68 m V/A。该电流传感装置具有结构简单,体积小,成本低,为今后电力系统中电流检测装置的研制提供了一种选择。An fiber current sensor is constructed by placing the gain magnetostrictive material （GMM） on fiber Bragg grating （FBG） system in current-induced magnetic field. The permanent magnet material is added at the two ends of GMM-FBG to form a static working point in bias magnetic field for the system. Besides, the GMM-FBG and permanent magnetic material are sealed by epoxy resin in order to insulate from external environment. Fiber Michelson interferometer linear sideband is used to demodulate the alternating strain on FBG to realize alternating current signal detection. The experimental results show that the maximum detected current is 1700 A and the voltage/ current sensitivity is 0.68 mV/A when the system is working in linear region. The proposed current sensing device with simple structure, small volume and low cost provides an alternative choice for future current detecting device in power system.

关 键 词：光纤光学 光学电流传感器 光纤布拉格光栅 光纤迈克耳孙干涉仪 

分 类 号：TN253[电子电信—物理电子学]