Qiang Shu, Fang Ji, Mingzhi Zhu
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, China; Institute of Mechanical Manufacturing Technology, Mianyang 621999, China.
Institute of Mechanical Manufacturing Technology, Mianyang 621999, China.
J Magn Reson. 2022 Feb;335:107128. doi: 10.1016/j.jmr.2021.107128. Epub 2021 Dec 15.
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 B and the sinusoidal carrier amplitude B 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/Hz within the bandwidth except the low frequency part.
在核磁共振陀螺仪中，铷原子既作为极化介质，又作为原位磁力计。获得了原位磁力计输出的解析解。对横向场的输出增益和解耦相位进行了解析推导。提出了一种通过在磁力计的不同偏移量下扫描相位来实验确定x和y输出的解耦相位的方法。通过实验和理论计算分析了磁场参数对输出增益和解耦相位的影响。发现主静态场B和正弦载波幅度B及其比值对输出增益和解耦相位有显著影响。准确确定解耦相位需要仔细最小化恒定残余场。当横向输入场在±100 nT以内且除低频部分外带宽内横向输出灵敏度为0.01 nT/Hz时，通过实验评估了原位磁力计的性能，耦合输出特性低于±0.16 nT。
