微型磁通门传感器的激励仿真设计

摘要

微型磁通门传感器因具有功耗低、灵敏度高、分辨率高、结构简单和成本低等特点,被广泛应用于地球物理勘探、地磁导航、太空环境监测、医学诊疗等弱磁场测量领域.而对于该传感器,激励效果的好坏直接决定整套系统的性能,因而有必要为激励模块建立准确的仿真模型.基于法拉第电磁感应定律对双铁芯磁芯结构进行数学建模,并给出正弦波激励下电压、磁场量等物理量的波形.依据中国科学院地质与地球物理研究所研制的磁通门磁强计KDM-01的结构参数构建激励模块的仿真模型,得到的仿真结果与测试结果基本一致.并将该模型应用于设计的磁强计中,测试数据与标准磁强计非常近似.两者证明了所建立的数值模型的有效性和准确性.%The micro-fluxgate sensor is widely used in the field of weak magnetic field measurement such as geophysical exploration, geomagnetic navigation, space environment monitoring, medical diagnosis and treatment and others because of its characteristics of low power consumption, high sensitivity, high resolution, simple structure and low cost. The excitation module directly determines the performance of the whole system and thus it is of significance to build an accuracy simulation model of the module. The mathematical model of the dual cores is built on the basis of the Faraday's law of electromagnetic induction, and the voltage waveforms and the magnetic value under the sinusoidal excitation are given. According to the structure parameters of the KDM-01 which is a fluxgate sensor designed by Institute of Geology and Geophysics, Chinese Academy of Sciences, a simulation model of the excitation module is built. The obtained simulation results are in good accordance to the test values. Then the model is applied to the designed magnetometer and the test data are similar enough to those of the standard magnetometer. It is proved that the built mathematical model for the excitation module is reasonable and accurate.