磁疗用永磁圆片磁源实测结果与分析

Testing and analysis of the magnetic sources of permanent magnet wafers for magnetotherapy

目的探讨磁疗常用永磁圆片磁源的磁特性，为科学合理地使用磁源提供依据。方法采用特定测量装置，对磁感应强度名义值为6mT、10mT、20mT、30mT、60mT、100mT、200mT、350mT的8组圆片磁源（轴向充磁）N极和s极的极面中心磁感应强度进行测量，根据检测结果进行磁源筛选。结果8组磁源中，磁源磁感应强度名义值与实测均值之间均有一定差别，个别组磁源名义值与实测均值相差接近20％；同一组磁源之间的磁感应强度测量值也都存在一定差别，同一磁源两极面磁感应强度均不相等，个别磁源差异较大。结论磁源使用前必需要进行实际测量其强度，剔除磁感应强度差异较大的磁源，以保证所用磁源磁感应强度的一致性。

Objective To explore the magnetic properties of permanent magnet wafers commonly used in magnetotherapy to provide a basis for the scientific and rational use of sources of magnetism. Methods A magnetometer was used to measure the magnetic induction intensities of the N and S polar centers of eight groups of magnet wafers （axial magnetization） with nominal magnetic induction intensities of 6 mT, 10 mT, 20 mT, 30 mT, 60 mT, 100 mT, 200 mT and 350 mT. Results There were some differences between the nominal values and the measured mean magnetic induction intensities. In a few groups the differences were close to 20% . There were also differences within the same group. The magnetic induction intensities of the two polar surfaces were not always equal for the same magnet, and there were large differences among individual magnets. Conclusions The intensities of magnetic sources must be measured before use to ensure the consistency of magnetic induction intensities in therapeutic applications.