基于高频激励的高精度交流电桥测温系统研究

Research on High Precision Temperature Measurement System Based on High Frequency AC Bridge

为实现对原子气室温度的高精度测量,同时避免测温电路产生的直流磁场或低频磁场对原子自旋系综运动状态的影响,设计了一种基于高频激励的交流电桥温度测量方法。首先,建立了测温电路的数学模型,并对模型中各元件参数之间的内在联系进行了分析。其次,对测温电路进行了灵敏度分析。然后,针对力学环境微小扰动对测温电路中导线分布参数的影响,优化设计了测温电路中相关元件的参数。最后,实验数据表明,优化后的交流测温系统测温稳定性提升了1个数量级。

To measure the temperature of the atomic cell accurately and to avoid the effect of low frequency magnetic field from the circuit on the spin ensemble, a temperature measurement syst em based on AC bridge stimulated by high frequency signal is designed. First, we set up the math ematic model of temperature measurement circuit and analyse the relation between the compo nents. Second, we analyse the sensitivity of the system. Third, we choose a better set of parame ters for the circuit to minimize the mechanical environment disturbance which changes the distribu ted parameters of the wires. I.ast, the result of the experiment shows that the stability of the de signed system is improved by an order of magnitude.