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Design of a non-magnetic temperature control system using AC bridge to measure temperature

机译：AC桥梁测量温度的非磁温控系统设计

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摘要

As the latest type of magnetometer, the SERF (spin exchange relaxation free) atomic spin magnetometer has ultrahigh theoretical accuracy. The alkali vapor cell, as the sensitive meter of the atomic spin magnetometer that carries the atomic spin ensemble, should minimize the magnetic field interference introduced by the alkali vapor cell temperature control system during the entire temperature measurement and heating process. Therefore, the realization of a non-magnetic temperature control system is very important to the SERF atomic spin magnetometer. At present, most alkali vapor cell temperature control systems use platinum resistance temperature measurement and electric heating schemes. The platinum resistance and heating film are the closest sources of low-frequency magnetic field interference to the alkali vapor cell. Therefore, this paper designs a scheme that uses AC bridge temperature measurement and high-frequency sine wave heating, which modulates the interference in the temperature measurement and heating process from low-frequency to high-frequency, avoids low-frequency magnetic field noise, and provides a good non-magnetic environment for the SERF atomic spin magnetometer. At the same time, experiments show that the non-magnetic temperature control system has good accuracy and stability.
机译：作为最新类型的磁力计，SERF（自旋交换弛豫免费）原子旋转磁力计具有超高理论精度。作为承载原子旋转集合的原子旋磁仪的敏感仪，碱蒸汽电池应在整个温度测量和加热过程中最小化由碱蒸汽电池温度控制系统引入的磁场干扰。因此，实现非磁性温度控制系统对Serf原子旋磁仪非常重要。目前，大多数碱蒸汽电池温度控制系统使用铂电阻温度测量和电加热方案。铂电阻和加热膜是对碱蒸气细胞的低频磁场干扰的最近源。因此，本文设计了一种使用交流桥温度测量和高频正弦波加热的方案，该方案将温度测量和加热过程中的干扰从低频到高频率调制，避免了低频磁场噪声，并且为Serf原子旋磁仪提供良好的非磁性环境。同时，实验表明，非磁性温度控制系统具有良好的准确性和稳定性。

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