Fast In-Situ Triaxial Remanent Magnetic Field Measurement for Single-Beam SERF Atomic Magnetometer Based on Trisection Algorithm  

作　　者：Tengyue LONG Bangcheng HAN Xinda SONG Yuchen SUO Le JIA 

机构地区：[1]Department of Instrumentation Science and Opto-Electronics Engineering,Beihang University,Beijing 100191,China [2]Hangzhou Extremely Weak Magnetic Field Major Science and Technology Infrastructure Research Institute,Hangzhou 310051,China

出　　处：《Photonic Sensors》2023年第3期77-89,共13页光子传感器（英文版）

基　　金：This work was supported by Beijing Natural Science Foundation(Grant No.4191002);Key Research&Development Program of Zhejiang,China(Grant No.2020C01037);the National Key Research&Development Program of China(Grant No.2018YFB2002405);the National Natural Science Foundation of China(Grant No.62073014).

摘　　要：We demonstrate a method for quickly and automatically detecting all three components of a remanent magnetic field around a shielded spin-exchange relaxation-free(SERF)atomic magnetometer(AM)using the trisection algorithm(TSA)for zero-field resonance(ZFR).To satisfy the measurement of AMs,a resonance light of the ^(87)Rb D1 line with a spectral width of less than 1 MHz is converted to circular polarization by a linear polarizer and a quarter-wave plate.After the light beam has passed through the alkali metal vapor cell,the residual magnetic field can be measured by searching for triaxial ZFR optical peaks.The TSA stably reduces the measurement time to 2.41 s on average and improves the measurement accuracy,significantly outpacing existing methods.The weighted averages of all measurements with corresponding uncertainties are(–15.437±0.022)nT,(6.062±0.021)nT,and(–14.158±0.052)nT on the x-,y-,and z-axes,respectively.These improvements could facilitate more extremely weak magnetic studies in real time,such as magnetoencephalography(MEG)and magnetocardiography(MCG)measurements.

关 键 词：Atomic magnetometer remanent magnetic field measurement spin-exchange relaxation free trisection algorithm 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]