A modified analytical model of the alkali-metal atomic magnetometer employing longitudinal carrier field*
A modified analytical model of the alkali-metal atomic magnetometer employing longitudinal carrier field*
复制标题
采用纵向载波场的碱金属原子磁力计的改进分析模型
DOI：
10.1088/1674-1056/abd7d3
复制
发表时间：
2021-05-01
影响因子：
1.7
通讯作者：
Yang, Kai-Yong
中科院分区：
文献类型：
--
作者：
Chen, Chang;Zhang, Yi;Yang, Kai-Yong
纵向载磁场碱金属原子磁力仪具有极高的横向磁场测量灵敏度，在各种精密测量科学技术中得到了广泛的应用。在实践中，磁强计的响应是不严格的比例测量的横向磁场和现有的基本分析模型，这种磁强计是有效的，只有当测量场的幅度非常小。在本文中，我们提出了一个修改后的分析模型，更明确地描述的实际性能的磁强计。我们发现了碱金属原子的纵向磁化强度是如何随较大的横向场而变化的。磁强计的线性响应能力由以下因素决定：纵向载流子场的幅度和频率、碱自旋的纵向和横向自旋弛豫时间以及横向场的旋转频率。采用摄动迭代法对该模型进行了详细、严格的理论推导，并通过仿真实验验证了该模型的有效性和正确性。该模型可用于更精确地测量较大的磁场，并配置具有适当线性范围的磁力计。
Alkali-metal atomic magnetometers employing longitudinal carrier magnetic field have ultrahigh sensitivity to measure transverse magnetic fields and have been applied in a variety of precise-measurement science and technologies. In practice, the magnetometer response is not rigorously proportional to the measured transverse magnetic fields and the existing fundamental analytical model of this magnetometer is effective only when the amplitudes of the measured fields are very small. In this paper, we present a modified analytical model to characterize the practical performance of the magnetometer more definitely. We find out how the longitudinal magnetization of the alkali metal atoms vary with larger transverse fields. The linear-response capacity of the magnetometer is determined by these factors: the amplitude and frequency of the longitudinal carrier field, longitudinal and transverse spin relaxation time of the alkali spins and rotation frequency of the transverse fields. We give a detailed and rigorous theoretical derivation by using the perturbation-iteration method and simulation experiments are conducted to verify the validity and correctness of the proposed modified model. This model can be helpful for measuring larger fields more accurately and configuring a desirable magnetometer with proper linear range.