摘要
探讨了光泵磁共振实验中用换向法测量地磁场水平分量时,共振信号参考点的选取对实验结果的影响。首先进行理论分析,分别用换向抵消法的扫场法和扫频法对不同的信号参考点进行公式推导,得到地磁场的水平分量;接着进行实验测量,计算出地磁场的水平分量。通过对扫场三角波信号直流分量和交流分量的分析,并利用抽运信号判断当示波器显示三角波的参考点与实际扫场信号的参考点相反时扫场与地磁场水平分量的方向关系,阐述了在实验测量中如何正确选择共振信号对应的参考点。从而提高了测量结果的准确度。
The article discussed how to choose the reference point of resonance signal which affects the results during the experiment of measuring the horizontal component of the geomagnetic field by the method of optical pump magnetic resonance. Firstly,the paper theoretically analyzed the different signal reference point by reversing field sweep method and sweeping frequency method,respectively. The formula of the horizontal component of the geomagnetic field was found; then,based on experiments and the formula,the horizontal component of the geomagnetic field was measured and calculated. By the means of analyzing the DC and AC signals of the scanning field＇s triangular wave,the article used the pumping signal to determinate the oriented relationship between scanning field and the horizontal component of geomagnetic field when the reference point of triangular wave printed on oscilloscope and the reference point of the actual scanning field had the opposite direction. The article elaborated on how to choose the appropriate resonance signal ＇s reference point during the experiment. The article improved the accuracy of the measurement and deepened the understanding of optical pump magnetic resonance.
出处
《实验室研究与探索》
CAS
北大核心
2016年第8期10-13,共4页
Research and Exploration In Laboratory
基金
国家自然科学基金(61503140)
全国教育信息技术研究"十二五"规划项目(136241506)
教研教改项目(Y1150870)
探索性实验项目(Y1150410)
学生研究计划项目(Y9160280)
关键词
光泵磁共振
地磁场水平分量
扫场
共振信号
optical pump magnetic resonance
the horizontal component of geomagnetic field
scanning field
resonance signal
