摘要
为了标定电子仪器设备,产生稳恒的磁场,提出了一种新颖的方形Helmholtz线圈的设计方法.根据电磁场叠加原理,建立了方形Helmholtz线圈理论模型,并用Matlab软件验证了模型的正确性.该模型较传统圆形Helmholtz线圈有更大的匀强场区.利用Maxwell软件进行仿真计算,得到了线圈周围磁场的分布,仿真结果验证了Helmholtz线圈计算方法的正确性.用空间利用率η比较了方形线圈与传统圆形线圈所产生的匀强磁场范围.制作了方形Helmholtz线圈,线圈臂长1. 5 m,匀强磁场的大小由输入电流控制.应用GSM-19T型质子磁力仪测量方形Helmholtz线圈激励磁场的幅值.实验表明,方形Helmholtz线圈中心可产生0～120μT幅值可调节的均匀电磁场区.
In order to calibrate electrical instruments and generate a constant magnetic field, a novel design method for square Helmholtz coil is proposed. According to the superposition principle in electromagnetics, the theory of the square Helmholtz coil is established, and the design method is verified by Matlab calculation. Compared with conventional circular Helmholtz coil, the novel square one is with a larger uniform region. Simulation work is conducted in Maxwell, and the distribution of the magnetic field is obtained. The results demonstrate the validation of the applied calculation method of the proposed Helmholtz model. The space utilization rate η is used to make a comparison between the square and circular coils for the uniform region. The square Helmholtz coil is fabricated, the length of a single square coil is 1.5 m, and the amplitude of the magnetic field is controlled by the current. The GSM-19 T proton magnetometer is used to measure the amplitude of the magnetic field generated by the square Helmholtz coil. Experimental results indicate that a wide-range variable uniform magnetic field from 0 to 120 μT is generated in the center of Helmholtz coils.
作者
王超
袁斌
毛军发
张爽
Wang Chao;Yuan Bin;Mao Junfa;Zhang Shuang(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;College of Electronic Science and Engineering,Jilin University,Changchun 130021,China)
基金
The National Natural Science Foundation of China(No.61327803)
