本文设计了一种简谐振动测量微弱磁场的实验装置.通过改变亥姆霍兹线圈中的电流I，精确调控小磁柱所在位置的磁场强度Bh，并利用高速摄像机和Tracker软件记录小磁柱随不同磁场变化的简谐振动周期 T，进而用Origin 软件拟合角频率平方w2随电流I的依赖关系，结合理论模型，从而计算出待测微弱磁场的大小和方向.

This paper designs an experimental device for measuring weak magnetic fields through simple harmonic motion. By adjusting the current I in the Helmholtz coil, the magnetic field intensity B at the magnetic columns position is precisely controlled. Using a high-speed camera and Tracker software, the vibration period Tof the magnetic column under different magnetic fields is recorded. Then, Origin software is used to fit the relationship between the square of angular frequency w2and current I. Combined with the theoretical model, this allows the calculation of the size and direction of the weak magnetic field.