Test and Calibration Method for High Accuracy Vector Atomic Magnetometer in Near Zero⁃field
WU Shuang1,2,3, XUE Hongbo1,2, FU Jiqing4, SONG Wei1,2, TAO Ran1,2, MIN Zewen1,2,3, ZHANG Wei4, WANG Jindong1,2, LI Hui1,2, LI Lei1,2
1.State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences,Beijing 100190, China
2.Key Laboratory of Solar Activity and Space Weather, National Space Science;Center, Chinese Academy of Sciences, Beijing 100190, China
3.University of Chinese Academy of;Science， Beijing 100049， China
4.National Institute of Metrology， Beijing 100029， China
Abstract：Vector atomic magnetometers for deep space magnetic field detection applications not only need to have high sensitivity in weak fields， but also need to have long-term accurate measurement capabilities. Therefore， it is necessary to test and calibrate the sensitivity and linearity of the vector atomic magnetometer in the near zero field， especially the performance of accuracy. At present， there is no device that can directly test and calibrate the magnetometer under weak magnetic field in the national standards and metrology institution. An indirect test and calibration device and method under near zero field is proposed. In the magnetic shielding cylinder， the magnetic field generating coil is calibrated by the calibrated CPT atomic magnetometer. The calibrated coil generates a weak artificial magnetic field. Combined with the zero-point rotation test calibration method， the accuracy of the magnetometer is calibrated. The test calibration and uncertainty analysis of the near zero-field high precision atomic magnetometer sensor are completed. The linearity within the ±5 nT range is 0.03%， the zero-point uncertainty is 12.90 pT， and the accuracy is 15.80 pT.
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WU Shuang, XUE Hongbo, FU Jiqing, SONG Wei, TAO Ran, MIN Zewen, ZHANG Wei, WANG Jindong, LI Hui, LI Lei. Test and Calibration Method for High Accuracy Vector Atomic Magnetometer in Near Zero⁃field. Acta Metrologica Sinica, 2025, 46(1): 80-86.
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2025, Vol. 46 
