磁传感器阵列测量电流时的干扰排除理论研究

用单个磁传感器测量母排周围的磁场可以得到母排中的电流，为了提高测量精度，在电流测量中引入了磁传感器阵列。提出一种基于离散傅立叶(DFT)分析的算法，用来区分测量电流产生的磁场和干扰电流产生的磁场。建立了适用于直流和交流、不同母排形状、任意数量平行母排的电流测量干扰排除数学模型。数值分析和初步试验结果验证了该模型的正确性。

INVESTIGATION ON THE THEORY OF INTERFERENCE REJECTION FOR CURRENT MEASUREMENT WITH MAGNETIC SENSOR ARRAYS

Solid-state magnetic sensor can be used to measure a current by sensing the field near the conductor in a non-contact way. In order to improve the accuracy of single sensor measurement system, magnetic sensor arrays have been introduced in the current measurement around the conductor. To separate the effects of the field generated by the current under measurement from the interference fields, an analytical algorithm based on Discrete Fourier Transform (DFT) is proposed. A general mathematical model of the interference analysis is presented, which can be used to measure both DC and AC current, and has no restriction on the shape and number of the parallel current conductors. Numerical simulations associated with preliminary experimental results have been verified the validity of the approach.