基于抽运光调制的SERF磁强计标量磁场测量方法  

Method for Scalar Magnetic Field Measurement of SERF Magnetometer Based on Pump Light Modulation

作　　者：马彦宁 王耀国 MA Yanning;WANG Yaoguo(National Institute of Metrology,Beijing 100029;School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191)

机构地区：[1]中国计量科学研究院,北京100029 [2]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《飞控与探测》2024年第6期82-88,共7页Flight Control & Detection

基　　金：中国计量科学研究院基本科研业务费项目(AKYZZ2435)。

摘　　要：针对航天器中矢量磁场测量装置校准的标量磁场测量需求,提出了一种基于抽运光调制的无自旋交换弛豫(Spin-Exchange Relaxation-Free,SERF)磁强计标量磁场测量方法,实现了不引入额外磁场的标量磁场测量。通过分析原子自旋在抽运光关闭后的自由进动瞬态响应,得出了自由进动频率与磁场标量幅值的关系,并基于此方法设计了相应的抽运光调制数据采集时序,实现了低磁场下的连续标量磁场测量。实验结果表明测量结果与施加的待测磁场拟合良好,在0~9nT测量范围中线性度为0.057%。本方法适用于小型化SERF原子磁强计,具备实现无干扰的矢量磁强计标定的能力。To meet the scalar magnetic field measurement requirements of vector magnetic field measurement device calibrations in spacecraft,a method for scalar magnetic field measurement of SERF magnetometer based on pump light modulation is proposed.The proposed method realizes the measurement of a scalar magnetic field without introducing an additional magnetic field.By analyzing the transient response of the atomic spin s free-precession after the pumping light is turned off,the relationship between the free-precession frequency and the magnetic field scalar amplitude is derived.Based on this method,the corresponding pump light modulation-data acquisition timing sequence is designed to realize continuous scalar magnetic field measurements at low magnetic fields.The experimental results show that the measurement results are well fitted to the applied magnetic field,and the linearity is 0.057%in the 0~9nT measurement range.This method is applicable to compact SERF magnetometers and has the ability to achieve interference-free calibration of vector magnetometers.

关 键 词：SERF磁强计 标量磁场 瞬态响应 光抽运 抽运光调制 

分 类 号：TN249[电子电信—物理电子学] TM936.1[电气工程—电力电子与电力传动]