Testing and analysis of the magnetic sources of permanent magnet wafers for magnetotherapy / 中华物理医学与康复杂志

ABSTRACT

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.