Suppression of modulation-magnetic-fields crosstalk for single-beam optically-pumped magnetometers

被引：6

作者：

Suo, Yuchen ^{[1
]}

Song, Xinda ^{[2
]}

Jiang, Liwei ^{[1
]}

Jia, Le ^{[1
]}

Long, Tengyue ^{[1
]}

Wu, Zhendong ^{[1
]}

机构：

[1] Beihang Univ, Sch Instrumentat & Optoelect Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Res Inst Frontier Sci, Beijing 100191, Peoples R China

来源：

MEASUREMENT | 2023年 / 217卷

关键词：

Optically-pumped magnetometer; Magnetic field modulation; Crosstalk; Closed-loop control;

D O I：

10.1016/j.measurement.2023.113059

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose a feasible method that enables suppression of crosstalk induced by the additional transverse (sinusoidal/noise) magnetic field near the modulation frequency of the arrayed single-beam optically-pumped magnetometers (OPMs), which is usually generated by adjacent channels, by locking the remanence to zero through a closed-loop control. Based on a miniaturized87Rb atomic cell of 3 x 3 x 3 mm, our method can significantly suppress the modulation magnetic field crosstalk. In addition, the magnetic field control circuit structure is optimized by investigating the effect of magnetic field noise on the sensitivity of the magnetometer. The sensitivity of OPM can reach 16fT/Hz1/2 between 10 and 100 Hz. These crosstalk amplitude results show good agreement with theoretical analysis. Our method is especially advantageous for future high -resolution magnetocardiography and magnetoencephalography systems where dense array with large amount of miniaturized magnetometers are required.

引用

页数：9