碱金属气室的温度波动与磁噪声是制约无自旋交换弛豫原子自旋陀螺仪灵敏度提升的关键因素。针对这两个问题，采用激光加热方式对气室进行无磁加热，从根本上消除磁噪声，在气室加热面及相邻上下两面装载石墨烯薄膜，进行光热转换、热传导以及避免杂散光干扰;采用线性自抗扰控制(Linear Active Disturbance Rejection Control，LADRC)与热管理技术相结合的方式，提高碱金属气室的控温精度与稳定度。设计基于温控系统的线性自抗扰控制器;从热传导、热对流、热辐射三方面出发设计热结构，优选石墨烯薄膜;搭建碱金属气室温控系统实验平台。研究结果表明，采用LADRC与热管理技术的碱金属气室温控系统的控温精度为±0。003℃，控温稳定度为6 mK。所得研究结果为后续原子自旋陀螺仪灵敏度的提升奠定了基础。
Non-magnetic Heating and High-precision Temperature Control of the Alkali-metal Vapor Cell in SERF Atomic Spin Gyroscope
The temperature fluctuation and magnetic noise in the alkali-metal vapor cell are key factors that restrict the sensitivity improvement of spin-exchange relaxation-free atomic spin gyroscopes. To deal with these two issues,a laser heating method is proposed to perform non-magnetic heating for the vapor cell,thus fundamentally eliminating the magnetic noise,and the graphene films are deposited on the heating surface,and adjacent upper and lower surfaces of the vapor cell for photothermal conversion,thermal conduction,and stray-light interference avoidance. The combination of linear active disturbance rejection control ( LADRC) and thermal management technology is used to improve the temperature control accuracy and stability of alkali-metal vapor cell. A linear active disturbance rejection controller based on temperature control system is designed. A thermal structure is designed and graphene film is selected in consideration of heat conduction,thermal convection and thermal radiation. An experimental platform was built for the temperature control system of alkali-metal vapor cell. The result shows that the temperature control accuracy of temperature control system of alkali-metal vapor cell using LADRC and thermal management technology is±0.003 ℃,and the temperature control stability is 6 mK. This lays the foundation for improving the sensitivity of atomic spin gyroscopes in the future.
万方数据
维普
