一般环境中亥姆霍兹线圈的检测与补偿

Measuring and Compensating Helmholtz Coils in Typical Environment

在一般环境中,由于背景磁场梯度的干扰,亥姆霍兹线圈显示的磁场相关数据不能证明他本身的性能,也无法进行正常的工作。因此如果条件所限只能居于一般环境,那么,首先必须尽量回避和清除外围的磁性物质及衍生的磁异常;必须修正检测的磁学数据以验证线圈系统对亥姆霍兹原理的把握;进而可以利用原线圈结构设立补偿绕组,随机抵消局域磁场梯度。实验证明,所得标志性参数仅比理论值差0.16%,与无磁场或均匀磁场空间所得结果可比。

Within a typical environment,with the interference from environmental magnetic grades,the indicated data of the magnetic field cannot measure the capability of the magnetic field produced by Helmholtz coils which are unable to work properly in such condition.As a result,the magnetic materials and magnetic abnormity derived from them should be avoided and eliminated;the indicated data of the magnetic field should be modified to measure Helmholtz coil system; the compensating magnetic coils based on original coil system are built to reduce the interference from environmental magnetic grades correspondingly.It has been proved by experiments that the difference between data derived from experiments and theoretic data is only 0.16%.The data derived from experiments approach the result of nonmagnetic or even magnetic field.