亥姆霍兹线圈磁场均匀性的研究

Study on Uniformity of Magnetic Field of Helmholtz Coil

为了探究亥姆霍兹线圈空间磁场均匀区域的大小、形状及范围,利用FD-HM-I型亥姆霍兹磁场测定仪及其所配备的高灵敏度毫特斯拉计传感器探头,探测了亥姆霍兹线圈轴截面上有限元磁场的大小,以两线圈中心连线的中点为坐标原点,建立坐标系,根据线圈的对称性,得到了亥姆霍兹线圈空间磁场均匀区域的大小、形状及范围.由于毫特斯拉计传感器探头的体积小、分辨率高,因此,该传感器适用于物理实验中弱磁场的测量,用它探测磁场准确度较高,误差较小。

In order to investigate the magnitude,shape and scope of uniform region of space magnetic filed of Helmholtz coil,the magnetic field magnitude of finite element of axial section of Helmholtz coil is measured using FD-HM-I type Helmholtz magnetic field determinator and sensor probe of mili-teslameter with well-appointed high sensitivity equipped by FD-HM-I type Helmholtz magnetic field determinator,coordinate system is established with the center point of two-coil center link as origin of coordinate,the magnitude,shape and scope of uniform region of space magnetic filed of Helmholtz coil is obtained according to the symmetry of the coil.As the size of sensor probe of mili-teslameter is smaller,distinguishability is higher,therefore,the sensor is applied for measuring low intensity magnetic field in physics experiments,and there is higher accuracy,less errors using it to measure magnetic fields.