亥姆霍兹线圈测量系统的测量原理及程序设计

Principle and Software Design of Helmhotz Coil Measurement System

叙述了利用磁通法建立亥姆霍兹线圈测量系统的测量原理 ,并将其应用于永磁体磁性能参数 (Br,Hc,易磁化轴方向等 )的测量 .在利用现有高性能积分器的基础上 ,还给出了测量程序的设计方法 ,并利用此测量系统对BEPC永久四极磁铁模型所用磁块进行了测量 .最后 。

This paper illustrates the measurement principle for constructing Helmhotz coil system by using the magnetic flux method, by which the magnetic parameters of a permanent block can be measured. Also, this paper gives the method of software design based on high precision integrator. If the size of Helmhotz coils is larger enough, the measurement errors coming from the deviations of the block positions can be ignored. With the flux measurement method, the magnetic flux variations between two sample points are not affected by the speed of the step motor, but only related to the space positions of the two sample points. So it reduces the errors coming from the motor vibrations and the speed changes effectively. Using this system, a permanent magnet block used for BEPC mini β permanent quadrupole has been measured. At last, this paper gives detailed discussions on the system errors arising from the mechanical manufacture deviations and the mechanical installation deviations.