关于产生均匀磁场的亥姆霍兹线圈的研究

Study on Helmholtz Coils Generating Uniform Magnetic Field

电磁感应法测磁场实验是电磁学中一个非常重要的实验,其中产生匀强磁场的一种重要方法是利用亥姆霍兹线圈来提供均匀磁场。但是,这种线圈的特点是只能在其公共轴线中点附近小范围区域产生均匀磁场。本文根据传统的双圆亥姆霍兹线圈设计了一种新形状的双锥式均匀磁场发生器,使产生的均匀磁场更加准确,最后通过实验测得的结果与数值模拟结果进行比较,实验结果与理论值基本吻合。通过对亥姆霍兹线圈的改进,不仅帮助学生更好的理解和掌握知识,而且锻炼了学生的动手能力,提高了学生的创新能力。在实践教学中将新的实验技术与电磁学理论相结合的教学模式,使抽象的物理概念和公式变得更加具体化、形象化,也收到了良好的教学效果。

Magnetic field measurement by electromagnetic induction is a very important problem in electromagnetics.An important method to generate uniform magnetic field is provided by Helmholtz coil.However,the coil is characterized by producing a uniform magnetic field only over a small area near the midpoint of its common axis.A new type of double cone uniform magnetic field generator is designed based on the traditional double circle Helmholtz coil to make the uniform magnetic field more accurate.Finally,the experimental results are compared with the numerical simulation results,and the experimental results are basically consistent with the theoretical ones.Through the improvement of Helmholtz coil,the knowledge is not only helped to better understand and mastered by students,but also is exercised students’hands-on ability and improves students’innovation ability by students.The teaching mode combining new experimental technology and electromagnetic theory has been applied in practical teaching,which makes the abstract physical concepts and formulas become more concrete and visualized,and has also received good teaching effects.