Design of 3-D Magnetic Field Sensor and Calibration Platform for TMS

In order to build an accurate measurement structure for transcranial magnetic stimulation (TMS) pre-testing, a kind of three - dimensional (3-D) magnetic field sensor and calibration platform are designed in this paper. This measurement structure is made up of 883-D magnetic field sensors. The 3-D magnetic field sensors based on Faraday law of electromagnetic induction are used to accurately measure pulsed magnetic fields generated by the stimulating coil. The coefficients of the sensors are calibrated in a designed 3-D calibration platform. And a series of experiments are carried out to verify the accuracy and stability of the sensors. The results from experiments indicate that the average measurement accuracy of 88 sensors is 1% and sensor performance is stable. In conclusion, this work provides a promising way to avoid direct human experiments and improve the security of TMS.