光磁共振实验测量地磁场方法的探究

摘要

Based on the principle of optical magnetic resonance ,several methods of measuring the horizontal and the vertical components of the geomagnetic field were compared and analyzed .Further‐more ,a modified method ,w hich could be used to measure both the horizontal and the vertical compo‐nents of the geomagnetic field more directly and more accurately ,was introduced by considering the influence of the vertical component on the magnetic resonance .In the case of no offsetting on the ver‐tical component and changing only the direction of the current ,the linear relationship between the difference of two resonant frequency square and the current was obtained ,and the slope of the fitting line was given ,thus the value of the magnetic field component was calculated .This method could a‐void the error caused by offsetting the vertical component of the geomagnetic field .%在对光磁共振实验原理深入了解的基础上，对光磁共振测量地磁场的诸多方法进行了比较研究，分析了外加水平及竖直方向磁场对共振条件的影响，提出了利用光磁共振实验直接测量地磁场的改进方法。在不抵消地磁场竖直分量的情况下，只改变电流方向而不改变其大小得出前后2次共振频率的平方差与电流的线性关系，进而拟合直线得出斜率，计算出地磁场分量的大小，从而避免了抵消法测地磁场竖直分量带来的误差。