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可温度自动跟踪的高精度光纤光栅电流互感器

, PP. 141-147

Keywords: 电流互感器,光纤布拉格光栅,分布式反馈半导体激光器,温度

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Abstract:

用光纤布拉格光栅(fiberBragggrating,FBG)粘贴到超磁致伸缩材料(giantmagnetostrictivematerial,GMM)上作为电流互感器的传感探头,用硅钢片构建磁路系统以约束并引导交变电流产生的磁力线进入传感探头,实现交变电流的传感,此传感系统具有全光纤结构和抗电磁干扰能力。由于光纤光栅是波长编码器件,该文提出一种基于分布式反馈(distributedfeedback,DFB)半导体激光器的正交解调方法。该解调方法结构简单,解调精度高,能够解耦波长信息的同时剔除了温度对光纤光栅波长漂移的影响,解决了光纤光栅对温度和应变交叉敏感的问题。实验结果表明,电流互感器最小可测电流为0.33A,最大可测电流为293.25A,满量程精度可以达0.11%。应用DFB激光器解调技术的光纤电流互感器,运用激光器的波长可调谐特性,采用经典控制理论的PID算法实现了电流与温度同时测量。

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