氦光泵磁力仪信号的分析及检测  

Analysis and detection of 4He optically pumped magnetometer signal

作　　者：张振宇[1,2] 程德福[1,2] 连明昌[1,2] 周志坚[1,2] 王君[1,2] 

机构地区：[1]吉林大学地球信息探测仪器教育部重点实验室,长春130026 [2]吉林大学仪器科学与电气工程学院,长春130026

出　　处：《仪器仪表学报》2011年第12期2656-2661,共6页Chinese Journal of Scientific Instrument

基　　金：国家"863"计划重大项目(2006AA06A201)资助

摘　　要：研究了氦光泵磁力仪中共振曲线、基频调制信号和二倍频信号的特征及关系,将二倍频信号应用到光泵磁力仪检测系统中,利用其幅值在共振区外为零、在共振点处达到峰值这一特性,解决了当外磁场变化超出共振区范围时,光泵磁力仪仅利用基频调制信号难以重新快速定位共振点的问题。系统实测信号幅值变化曲线与数学模型曲线相符合,实测共振曲线线宽约200 nT,在共振点处二倍频信号经放大其峰峰值可达12.6 V,满足实用要求,为光泵磁力仪性能的提升提供了有效方法。The characteristics and relations of the resonance curve, fundamental and doubled frequency signals in 4 He optically pumped magnetometer are studied. The OPM （optically pumped magnetometer） detection system uses the doubled frequency signal, which has the characteristic that its amplitude is zero outside the resonance region and achieves the peak at the resonance point. Therefore, we solve the problem that the resonance point of the OPM is diffi- cult to relocate quickly when the change of magnetic field goes beyond the resonance region in traditional OPM that just uses the fundamental frequency signal alone. The measured signal amplitude curves are consistent with the mathematical model curve, the measured line width of the resonance curve is about 200 nT, and the peak-to-peak value of the doubled frequency signal at the resonance point can achieve 12.6 V after amplification, which meets the practical demands and will provide an effective method to enhance the performance of optically pumped magnetometer.

关 键 词：光泵磁力仪 共振曲线 二倍频信号 幅值变化 相敏检测 

分 类 号：TN911.23[电子电信—通信与信息系统]