Analysis and demonstration of the in-situ magnetometer for nuclear magnetic resonance gyroscopes

• Published in: Journal of magnetic resonance (1997) 2022-02, Vol.335, p.107128-107128, Article 107128
• Main Authors: Qiang, Shu, Fang, Ji, Mingzhi, Zhu
• Format: Article
• Language: English
• Subjects: In-situ magnetometer; Influence analysis; Nuclear magnetic resonance gyroscope
• ISSN: 1090-7807; 1096-0856
• DOI: 10.1016/j.jmr.2021.107128

[Display omitted] •Analytical solution and the output gains and the decoupling phases for the in-situ PMAM magnetometer were obtained.•Influence of field parameters on the output gains and the decoupling phases were analyzed by experiment and theoretical computations.•The transverse coupled output is bellow 0.16% with sensitivity about 0.01nT/Hz0.5. Rb atom serves as both polarization medium and an in-situ magnetometer in a nuclear magnetic resonance gyroscope. Analytical solution for the in-situ magnetometer output is obtained. The output gains and the decoupling phases for the transverse fields are developed analytically. A method to determine experimentally the decoupling phases for the x and y outputs by scanning the phases at different offsets of the magnetometer is proposed. Influence of magnetic field parameters on the output gains and the decoupling phases are analyzed by experiment and theoretical computations. It is found that the main static field B0 and the sinusoidal carrier amplitude Bc and their ratios have significant effects on the output gains and decoupling phases. Accurate determination of the decoupling phases needs careful minimization of the constant residual field. The performance of the in-situ magnetometer is evaluated by experiment with the coupled output characteristic bellow ±0.16 nT when the transverse input field is within ±100 nT and the transverse output sensitivity 0.01nT/Hz0.5 within the bandwidth except the low frequency part.