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Bulletin of the American Physical Society

Rotation Measurement with a K-Rb- 21 Ne Atomic Spin Co-magnetometer Gyroscope

Yao Chen, Sheng Zou, Lihong Duan, Jiancheng Fang

Published Jun 4, 2014• 0 citations
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change interaction. In a K-Rb- 21 Ne co-magnetometer which was used for rotation sensing, Rb atomic spins and the 21 Ne nuclear spins couple together by spin exchange. Due to the large Rb density and the Fermi contact constant of Rb- 21 Ne pair, the magnetization field of Rb atomic spins is much larger than that of the K in a K- 3 He co-magnetometer. At the co-magnetometer working point, the precession frequency of Rb atomic spins are much larger than that of the 21 Ne spins. The decay rate and precession frequency of 21 Ne atoms is much smaller than that of the point when the precession frequencies of the Rb and 21 Ne atoms are the same. In this experiment, the dynamics of the Rb- 21 Ne pair at different holding magnetic field point were studied. The frequency response of the co-magnetometer to oscillating magnetic field at different holding magnetic field point was also studied.

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Abstract We propose a new model for magnetic field errors based on the rotation measurement of the K-Rb- 21 Ne co-magnetometer, considering the density ratio and spin collisions. The spin polarization characteristics of different alkali metal density ratios were analyzed by creating five cells with different density ratios, and the correctness of the magnetic field error model was verified experimentally. Moreover, the effects of five different alkali metal density ratios of cells on the sensitivity, long-term stability and magnetic field error suppression of the K-Rb- 21 Ne co-magnetometer were investigated experimentally. When the density ratio is 1:107, there can be the optimal magnetic field error suppression effect, sensitivity and long-term stability. According to the derived magnetic field error equation, the magnetic noise error of the K-Rb- 21 Ne co-magnetometer with an optimized density ratio is reduced by nearly 5 times from 260°/h/nT to 56.5°/h/nT, the sensitivity is improved from 2.9×10 −5 °/s/Hz 1 / 2 to 7.0×10 −6 °/s/Hz 1 / 2 at 1 Hz, and the long-term stability Allan variance over two hours is improved from 1.9×10 −2 °/h to 8.9×10 −3 °/h. This result provides a theoretical basis for designing the parameters of the K-Rb- 21 Ne co-magnetometer cell.

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Accurate rotation measurement with a cold atom gyroscope

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Progress on a new pulsed 87^{87}87Rb-21^{21}21Ne co-magnetometer
change interaction. In a K-Rb- 21 Ne co-magnetometer which was used for rotation sensing, Rb atomic spins and the 21 Ne nuclear spins couple together by spin exchange. Due to the large Rb density and the Fermi contact constant of Rb- 21 Ne pair, the magnetization field of Rb atomic spins is much larger than that of the K in a K- 3 He co-magnetometer. At the co-magnetometer working point, the precession frequency of Rb atomic spins are much larger than that of the 21 Ne spins. The decay rate and precession frequency of 21 Ne atoms is much smaller than that of the point when the precession frequencies of the Rb and 21 Ne atoms are the same. In this experiment, the dynamics of the Rb- 21 Ne pair at different holding magnetic field point were studied. The frequency response of the co-magnetometer to oscillating magnetic field at different holding magnetic field point was also studied.
Abstract We propose a new model for magnetic field errors based on the rotation measurement of the K-Rb- 21 Ne co-magnetometer, considering the density ratio and spin collisions. The spin polarization characteristics of different alkali metal density ratios were analyzed by creating five cells with different density ratios, and the correctness of the magnetic field error model was verified experimentally. Moreover, the effects of five different alkali metal density ratios of cells on the sensitivity, long-term stability and magnetic field error suppression of the K-Rb- 21 Ne co-magnetometer were investigated experimentally. When the density ratio is 1:107, there can be the optimal magnetic field error suppression effect, sensitivity and long-term stability. According to the derived magnetic field error equation, the magnetic noise error of the K-Rb- 21 Ne co-magnetometer with an optimized density ratio is reduced by nearly 5 times from 260°/h/nT to 56.5°/h/nT, the sensitivity is improved from 2.9×10 −5 °/s/Hz 1 / 2 to 7.0×10 −6 °/s/Hz 1 / 2 at 1 Hz, and the long-term stability Allan variance over two hours is improved from 1.9×10 −2 °/h to 8.9×10 −3 °/h. This result provides a theoretical basis for designing the parameters of the K-Rb- 21 Ne co-magnetometer cell.