利用简易装置测量地磁场的新方法  

New method of measuring geomagnetic field with simple device

作　　者：黄诗淇 刘晨晨 王思[1] 唐子骞 刘伟[1] 史庆藩[1] HUANG Shiqi;LIU Chenchen;WANG Si;TANG Ziqian;LIU Wei;SHI Qingfan(Center of Physical Experiments, Beijing Institute of Technology, Beijing 100081, China)

机构地区：[1]北京理工大学物理实验中心

出　　处：《实验技术与管理》2019年第5期61-63,共3页Experimental Technology and Management

摘　　要：通过小圆柱永磁体在匀强磁场中的周期性振动测量当地的磁感应强度及磁倾角。使用亥姆霍兹线圈逐次改变永磁体所在位置处的磁场强度,测量在不同强度磁场下永磁体振动的周期,使用Matlab对实验数据进行二次曲线拟合,由二次曲线的系数可以计算得到当地磁感应强度在水平和竖直方向上的分量,进而得到磁倾角。实验设计巧妙,不仅避开了一些其他地磁场测量实验中的系统误差,使实验结果更精确,同时大大降低了地磁场测量实验的成本。The local geomagnetic field intensity and magnetic dip angle are measured by periodic vibration of small cylindrical permanent magnet in uniform magnetic field. The Helmholtz coil is adopted to change the magnetic field intensity at the position of permanent magnet step by step, and the vibration period of permanent magnet under different magnetic field intensity is measured. The experimental data are fitted with quadratic curve by using Matlab. The component of geomagnetic field intensity in horizontal and vertical directions can be calculated from the coefficients of quadratic curve, and then the magnetic dip angle can be obtained. The ingenious design of the experiment not only avoids the systematic errors in some other geomagnetic field measurement experiments, but also makes the experimental results more accurate, and greatly reduces the cost of geomagnetic field measurement experiments.

关 键 词：地磁场测量 物理实验 曲线拟合 

分 类 号：O441.5[理学—电磁学]