原子干涉磁力仪信号对比度研究与分析

Signal contrast research and analysis for atomic interference magnetometer

为了研究基于相干布居俘获原理的原子干涉磁力仪传感系统并对其进行变量控制分析,针对其传感系统建立数学模型以表示输入变量与输出信号间的关系,同时建立鉴频信号对比度关键变量数学模型,对其中影响程度较大的原子气室温度和激光器电流进行信号对比度实验.实验结果表明:鉴频信号的平均对比度在3%左右,与模型计算结果的量级相符,原子气室温度和激光器电流的变化对信号对比度的影响程度符合模型计算结果.实验还同时确定了传感器获得最佳信号对比度时的变量控制范围.

In order to study the sensor of atomic interference magnetometer based on coherent population trapping principle and analyze its control variables,a mathematical model was proposed to formulate the relationship between system input variables and output signals.A mathematical model of the key variables of frequency discrimination signal contrast was also established and signal contrast experiments were performed to observe the atomic gas chamber temperature and laser input current,which are the key factors in this system.Experimental results showed that the average contrast of frequency discrimination signal was about 3%,which was in agreement with the order of magnitude of the model.The influence of the atomic gas chamber temperature and the laser current on the signal contrast was also in accordance with the results of the model.Moreover,the experiments also determined the range of dynamic operation points for an optimal signal contrast.