单光束 SERF 磁强计三轴磁场解耦磁补偿校准方法

针对单光束SERF原子磁强计磁补偿过程中的三轴磁场耦合问题，提出了一种对磁强计三轴顺序补偿值进行反向校准的方法，用于减小三轴补偿过程中产生的耦合磁场。首先，构建了三轴磁场耦合数学模型，即一个3×3的耦合系数矩阵，来描述三轴之间的磁场耦合关系，并对实验室磁强计样机进行了三轴耦合系数测试。然后，提出了一种应用三轴耦合系数对三轴顺序补偿值进行反向校准的方法；最后，对比了校准前后的磁补偿效果。实验表明，经三轴顺序补偿反向校准后，磁强计的响应线宽平均变窄2～10 Hz,灵敏度提高3～5 fTHz^1/2,验证了该方法的有效性，为进一步优化磁补偿技术奠定了基础。

Sequential magnetic compensation calibration method of single beam SERF magnetometer based on three-axis magnetic field decoupling

The magnetic compensation process of single beam SERF atomic magnetometer has the problem of three-axis magnetic field coupling. To address this issue, a method of reverse calibration of three-axis sequential compensation value of magnetometer is proposed to reduce the coupling magnetic field in the process of three-axis compensation. Firstly, a three-axis magnetic field coupling mathematical model is formulated, which is a 3×3 to describe the magnetic field coupling relationship between three axes. The triaxial coupling coefficient of the laboratory magnetometer prototype is tested. Then, a method of reverse calibration of triaxial sequence compensation value by using the triaxial coupling coefficient is proposed. Finally, the magnetic compensation effects before and after calibration are compared. Experimental results show that after the reverse calibration of triaxial sequential compensation, the average response linewidth of the magnetometer is narrowed by 2~ 10 Hz and the sensitivity is improved by 3~ 5 fT/ Hz 1/ 2 . The effectiveness of this method is verified, which lays a foundation for further optimizing the magnetic compensation technology.