Three-axis residual-magnetic-field measurement based on atomic magnetometer embedded in nuclear magnetic resonance gyroscope

doi:10.3969/j.issn.1000-5641.2025.03.010

Abstract

Abstract:

To ensure that the Larmor precession frequency of noble gas nuclei is solely determined by the applied main magnetic field, one must eliminate the residual background magnetic field, thereby providing the foundation for achieving high-precision nuclear magnetic resonance gyroscopes (NMRGs). Hence, accurate measurement of the residual magnetic field is critical for realizing this objective. In this study, the three-axis residual magnetic field is measured using the alkali-metal atomic magnetometer embedded within the NMRG system. Under specific experimental conditions, the magnitudes of the residual magnetic field in the x, y, and z axes are determined, respectively, which create the conditions necessary for effective three-axis residual field compensation in the gyroscope. Furthermore, when the main magnetic field is applied along the z-axis, the noble gas atoms are polarized due to spin-exchange collisions with alkali-metal atoms, thus generating an equivalent magnetic field along the z-axis. This equivalent magnetic field can be measured by using the embedded atomic magnetometer. These findings provide essential insights into spin-exchange collisions between alkali-metal and noble gas atoms, thereby enabling an analysis of the Fermi-contact-interaction enhancement factor and other critical parameters within the cell.

Key words: nuclear magnetic resonance gyroscope(NMRG), magnetometer, residual magnetic field, polarized equivalent magnetic field

CLC Number:

O439

Wenbin YU, Xinye XU. Three-axis residual-magnetic-field measurement based on atomic magnetometer embedded in nuclear magnetic resonance gyroscope[J]. J* E* C* N* U* N* S*, 2025, 2025(3): 80-89.

Figures/Tables 11

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