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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。
The fiber Bragg grating (FBG) is pasted on the GMM, and the permanent magnetic material is used to establish the bias magnetic field at both ends to determine the working point of the static magnetic field of the system. The epoxy resin is sealed and insulated and placed in a magnetic field In, constitute the optical fiber current sensor. By using the fiber side-by-side interferometer linear sideband fiber Bragg grating alternating strain demodulation, to achieve the AC current signal detection. Experimentally, the maximum linear current amplitude detectable in the linear output range of the sensor is 1700 A and the sensing system level / current sensitivity is 0.68 mV / A. The current sensing device has the advantages of simple structure, small size and low cost, and provides an option for the future development of the current detecting device in the power system.