基于磁场调制的高动态范围单光束矢量原子磁力计

IF 4.4 Q1 OPTICS
Junlin Chen, Liwei Jiang, Xin Zhao, Jiali Liu, Yanchao Chai, Mengnan Tian, Zhenglong Lu
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引用次数: 0

摘要

在地球物理勘探和类似应用中,磁强计需要捕捉完整的磁场信息,包括大小和方向。尽管矢量原子磁强计最近取得了进步,但它们经常面临一些问题,阻碍了实际应用。为了克服这一问题,我们提出了一种基于非线性磁光旋转(NMOR)效应的高动态范围单光束矢量原子磁强计,利用一个应用三轴调制磁场的闭环系统。在这种方法中,闭环测量是通过锁相环(PLL)实现的,外加调制磁场的频率明显高于锁相环的响应带宽。这样就可以从调制磁场响应信号中提取方向信息,并从 PLL 锁定频率中提取幅值信息。通过建立任意磁场方向下的 NMOR 原子磁力计模型,并推导出获取磁场方向的方法,对提出的方法进行了理论分析。在进一步的实验验证中,证明了矢量原子磁强计可实现三轴矢量磁场测量,对磁场幅值、倾角和方位角的灵敏度近似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Single-Beam Vector Atomic Magnetometer with High Dynamic Range Based on Magnetic Field Modulation

Single-Beam Vector Atomic Magnetometer with High Dynamic Range Based on Magnetic Field Modulation

In geophysical exploration and similar applications, magnetometers need to capture the complete magnetic field information, including both the magnitude and direction. Despite recent advancements in vector atomic magnetometers, they often face issues that hinder practical use. To overcome this, a high dynamic range single-beam vector atomic magnetometer based on the nonlinear magneto-optical rotation (NMOR) effect is proposed, utilizing a closed-loop system with applied three-axis modulation magnetic fields. In this method, closed-loop measurement is achieved using a phase-locked loop (PLL), with the frequencies of the applied modulation magnetic fields being significantly higher than the response bandwidth of the PLL. This allows directional information to be extracted from the modulation fields response signal and magnitude information from the PLL-locked frequency. A theoretical analysis of the proposed method is conducted by establishing an NMOR atomic magnetometer model under arbitrary magnetic field directions and deriving the method for obtaining the magnetic field direction. In further experimental validation, it is demonstrated that the vector atomic magnetometer can achieve measurement of three-axis vector magnetic fields, with a sensitivity of approximately 500 fT ( Hz ) 1 $500\nobreakspace \mathrm{fT (\sqrt {Hz})^{-1}}$ for magnetic field magnitude, 0.29 mrad ( Hz ) 1 $0.29\nobreakspace \mathrm{mrad (\sqrt {Hz})^{-1}}$ for inclination angle, and 0.94 mrad ( Hz ) 1 $0.94\nobreakspace \mathrm{mrad (\sqrt {Hz})^{-1}}$ for azimuth angle.

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CiteScore
7.90
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