Simulation and Experimental Research of Magnetic Field Produced by Permanent Magnet Used in Magnetic Localization

The mathematical model of magnetic field produced by the permanent magnet is a key problem on magnetic localization of micro-medical devices in human body.Magnetic dipoles model and equivalent magnetic monopoles model are two often used models for obtaining static magnetic field distribution.The two models were used to simulate the magnetic field of cylinder magnet used in the drug delivery capsule.The calculation results of the two models are very close when the distance between the field point and the magnet is larger as 10 times of the magnet's size.The real experiments on the experimental device approved the simulation results,which mean that the magnetic dipoles model is suitable for magnetic localization of micro-medical devices in human body when the distance between the magnet and the magnetic sensor is larger as 10 times of the magnet's size.