核磁共振陀螺仪泵浦光频率波动抑制

发布时间：2018-04-22 12:33

本文选题：核磁共振陀螺仪 + 零偏稳定性　；参考：《中国惯性技术学报》2017年02期

【摘要】：核磁共振陀螺仪利用原子核自旋磁矩在静磁场中进动频率的不变性敏感载体转动信息。针对泵浦激光频率漂移影响核磁共振陀螺仪性能的问题,研究了泵浦激光频率漂移影响核磁共振陀螺仪性能机理和抑制方法。通过分析核磁共振陀螺仪理论输出的数学模型和自旋光泵极化~(129)Xe核子的过程,阐明了泵浦激光频率波动对陀螺仪性能影响的机理。分析表明,为了获得更高的碱金属极化率和稳定性,从而得到更好的陀螺仪零偏稳定性,需要将泵浦光的频率稳定在~(87)Rb的原子的共振跃迁频率处。采用波长调制法实现了泵浦光频率的稳定控制。通过实验对比发现:稳频使得陀螺仪的零偏稳定性从389.68(°)/h(1σ)降低至40.74(°)/h(1σ),降低了89.5%。因而得出结论:抑制泵浦激光频率的漂移可以有效提高核磁共振陀螺仪的性能,主要体现在陀螺仪的零偏稳定性上。
[Abstract]:The magnetic resonance gyroscope uses the rotation information of the invariant carrier of the precession frequency of the nuclear spin magnetic moment in the static magnetic field. Aiming at the problem that the frequency drift of pump laser affects the performance of NMR gyroscope, the mechanism and suppression method of the influence of frequency drift of pump laser on the performance of NMR gyroscope are studied. By analyzing the mathematical model of the theoretical output of nuclear magnetic resonance gyroscope and the process of polarizing 129Xe nucleon with spin pump, the mechanism of the effect of pump laser frequency fluctuation on the performance of the gyroscope is explained. The analysis shows that in order to obtain higher polarizability and stability of alkali metals and obtain better stability of zero bias of gyroscopes, it is necessary to stabilize the frequency of pump light at the resonant transition frequency of the atoms of Qian87 Rb. The stable control of pump frequency is realized by wavelength modulation method. The experimental results show that the stability of zero bias of gyroscope is reduced from 389.68 (掳/ h ~ (-1 蟽)) to 40.74 (掳/ h ~ (-1) 蟽 ~ (-1)) by frequency stabilization, and the stability of gyroscope is decreased by 89.5%. It is concluded that the performance of the NMR gyroscope can be improved effectively by suppressing the drift of the pump laser frequency, which is mainly reflected in the stability of the gyroscope with zero bias.
【作者单位】：北京航天控制仪器研究所;
【基金】：国家自然科学基金(11304007,61501015)
【分类号】：TN96

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