Current measurement method based on magneto-optic rotation effect  

作　　者：SHUI Huasheng RONG Yufei JIANG Chunlei DONG Taiji 

机构地区：[1]College of Electrical and Information Engineering,Northeast Petroleum University,Daqing 163318,China

出　　处：《Optoelectronics Letters》2023年第9期563-569,共7页光电子快报（英文版）

基　　金：the Joint Guidance Project of Natural Science Foundation of Heilongjiang Province(No.LH2021F008)。

摘　　要：Aiming at the approximate measurement of magnetic rotation angle in optical current sensor based on light intensity detection mode,this paper proposes a current measurement method based on triangular constant transformation to reconstruct magnetic rotation angle,so as to avoid the large current measurement error caused by the approximate measurement of the magnetic rotation angle.By extracting the direct current(DC)component and the alternating current(AC)component of the light intensity signal detected by the photoelectric detector(PD),the sine signal containing the magnetic rotation angle is directly obtained by dividing the two components,and then the triangular identity transformation method is used to linearly demodulate the magnetic rotation angle and reconstruct the current waveform.The experimental results show that the relative error of current measurement does not exceed 1.40%in the current range of 0.05—0.50 A,which is less than the approximate linear measurement(ALM)method,and the magnetic rotation angle and the current have a good linear relationship.

关 键 词：Current measurement method based on magneto-optic rotation effect 

分 类 号：TM933.1[电气工程—电力电子与电力传动] TP212[自动化与计算机技术—检测技术与自动化装置]