Triaxial precise magnetic field compensation of a zero-field optically pumped magnetometer based on a single-beam configuration.
Triaxial precise magnetic field compensation of a zero-field optically pumped magnetometer based on a single-beam configuration.
复制标题
基于单光束配置的零场光泵磁力计的三轴精确磁场补偿。
DOI：
10.1364/oe.464361
复制
发表时间：
2022
期刊：
影响因子：
3.8
通讯作者：
Jixi Lu
中科院分区：
文献类型：
--
作者：
Shaowen Zhang;Kaixuan Zhang;Ying Zhou;Mao Ye;Jixi Lu
三轴磁场补偿是零场光泵磁强计（OPM）实现零场环境的关键。在这项工作中，我们展示了一个三轴磁场补偿方法的零场OPM的基础上单束配置。它包括两个程序：（1）预补偿，通过低频磁场调制初步抵消环境剩余磁场;以及（2）精确补偿，通过高频磁场调制进一步补偿剩余磁场。该方案能够快速、精确地补偿大范围磁场，并以简单的过程支持三轴剩余磁场的真实的零点采集。实验结果表明，该补偿器在敏感轴上的补偿分辨率优于1 pT，且明显小于实验环境的波动。我们的工作目标是快速生成高精度OPM的零场环境，这对于心磁图（MCG）和脑磁图（MEG）等新兴应用尤其有利。
Triaxial magnetic field compensation is crucial for a zero-field optically pumped magnetometer (OPM) in pursuit of a zero-field environment. In this work, we demonstrate a triaxial magnetic field compensation method for zero-field OPM based on single-beam configuration. It consists of two procedures: (1) pre-compensation to preliminarily cancel out ambient residual magnetic field by low-frequency magnetic field modulation; and (2) precise compensation to further compensate the residual magnetic field by high-frequency magnetic field modulation. This scheme enables rapid and precise compensation of a large-scale magnetic field and supports real null-point acquisition of the triaxial residual magnetic fields with simple processes. The experimental results show that the compensation resolution on the sensitive axis is better than 1 pT and significantly less than the fluctuation of experimental environments. Our work targets on the quick generation of a zero-field environment for high precision OPM, which is especially advantageous for emerging applications including magnetocardiography (MCG) and magnetoencephalography (MEG).