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原子自旋陀螺仪作为目前最新一类陀螺仪,具有超高的理论精度。碱金属气室是原子自旋陀螺仪承载原子自旋的敏感表头。通过电加热来使碱金属达到饱和蒸气压,但是电加热过程中会引入电磁干扰等噪声,进而影响原子自旋陀螺仪精度和灵敏度。为减小碱金属气室加热的电磁噪声对原子自旋陀螺仪的影响,从加热器结构与加热驱动信号两个方面进行了电磁噪声抑制实验研究。我们设计了具有磁场噪声抑制作用的异形加热膜,设计了高频正弦波作为加热驱动信号,构建了碱金属气室集成化无磁电加热单元。通过实验测试,本系统引入的等效磁场噪声优于17f T/Hz1/2,气室温度稳定度优于±0.006℃,为原子自旋陀螺仪的性能提升提供了可靠保障。
Atomic spin gyroscope as the latest type of gyroscope, with high theoretical accuracy. Alkaline gas cells are atomic spin gyroscope atomic spin bearing sensitive header. Alkali metal reaches the saturated vapor pressure by electric heating, but noise such as electromagnetic interference is introduced during the electric heating, thereby affecting the accuracy and sensitivity of the atomic spin gyro. In order to reduce the influence of the electromagnetic noise heated by the alkali metal chamber on the atomic spin gyro, electromagnetic noise suppression experiment is studied from the heater structure and the heating drive signal. We designed a shaped heating film with magnetic field noise suppression and designed a high-frequency sine wave as a heating drive signal to build an integrated magnetless cell with an alkali metal chamber. Through experimental tests, the equivalent magnetic field noise introduced by the system is better than 17f T / Hz1 / 2, and the gas chamber temperature stability is better than ± 0.006 ℃, which provides a reliable guarantee for the performance of atomic spin-gyro.