高频脉冲磁场动态检测技术研究

目的：为解决目前通用的经颅磁刺激设备不具有对磁场实时动态检测功能这一问题,基于法拉第电磁感应法,开展对10 kHz～1 MHz脉冲磁场动态检测技术的研究.方法：设计一种磁场动态测量与标定装置,选用正弦脉冲施加于磁场发生线圈,采集检测装置线圈上的感应电动势,通过信号处理电路完成所采集信号的求差、放大、滤波和积分处理,从而得到脉冲磁场参数.结果：该技术实现了对频率在10 kHz～1 MHz之间、强度为μΤ量级磁场的准确测量,测量结果通过标定,与真实值的相对误差小于2.5％,显示出较好的稳定性和一致性.结论：该技术能够对脉冲磁场进行较准确的测量和标定,可通过进一步的研究投入实际应用.

Study on Technology of High-frequency Pulsed Magnetic Field Strength Dynamic Measurement

Objective To research dynamic measurement for 10 kHz～1 MHz level weak pulsed magnetic-field based on Faraday＇s law of electromagnetic induction so as to measure the value of pulsed magnetic-field strength accurately.Methods A dynamic measure and calibration device for magnetic-field were designed,and the induced electromotive force was collected from the detection coil device while some pulse magnetic field passed through the coil,and finally the pulsed magnetic field parameters were obtained after signal processing of differencing,amplification,filtering and integration by the circuits.Results Experiments showed that,under good stability and consistency,accurate measurement of magnetic-field strength could be achieved,with frequency from 10 kHz to 1 MHz and strength level at micro-Tesla.Calibration results carried out a measuring relative error less than 2.5%.Conclusion The research also shows that this method is capable of pulsed magnet field accurate measuring and calibrating.