坑道水核磁共振探测激发磁场计算与测试方法研究

Research on calculation and measurement method of magnetic field for tunnel water detection by MRS

提出一种测量激发场垂直于地磁场分量的测量方法:应用固定线圈电磁感应法测量激发场,应用磁通门传感器测量地磁场,通过矢量运算求解激发场垂直于地磁场的分量。制作了激发场测量装置,通过对比激发场的径向分量和轴向分量的理论计算值和实测值,验证测量装置有效性。分析固定点处激发场垂直于地磁场的分量受线圈布设方向的影响,推导出固定点处激发场垂直于地磁场的分量取最大值时线圈布设角度求解方法,为实际探测线圈布设方向提供理论指导。

Magnetic field component values,which is vertical to the geomagnetic field is put forward：the fixed coils electromagnetic induction method is adopted to detect the magnetic field,flux-gate sensor method is adopted to detect geomagnetic field ,the magnetic field’s component values,which is vertical to the geomagnetic field,is calculated through the vector calculation. The magnetic field detection device is made. By comparing theoretical calculation with actual measurement of magnetic field’s radial component values and axial component values,the magnetic field detection device is proved to be effective. The influnence,which is caused by the excitation direction of coil changed,to a fixed point’s magnetic field component values,which is vertical to the geomagnetic field,is analyzed. The method to calculate the excitation coils’best direction is put forward. In this direction,a fixed point’s magnetic field component values,which is vertical to the geomagnetic field ,is the biggest. As a result,it gives a theory guidence in the specific detection.