碱金属气室无磁电加热技术研究与系统设计

Study on Non-magnetic Heating Technology and System for Alkali Vapor Cells

摘要:

基于量子精密测量的原子自旋陀螺仪具有高精度、小体积、低成本等优势,被认为是未来陀螺仪的发展方向;原子自旋陀螺仪的核心部件是承载原子自旋的碱金属气室;碱金属气室加热温度的稳定性是决定原子自旋陀螺仪精度和灵敏度的重要因素之一;同时,原子自旋陀螺仪的高灵敏度使其对磁场噪声极其敏感,因此要求加热过程不能引入额外的磁场干扰;针对以上要求,对原子自旋陀螺仪的无磁电加热技术进行了研究;设计并搭建了以Pt1000作为温度传感器,双层对称结构的加热膜作为加热元件,结合源测量单元、数据采集板卡、正弦波信号发生电路、驱动电路以及LabVIEW软件平台构成的无磁电加热系统;通过实验测试,本系统引入的等效干扰磁场优于15 fT/Hz1/2,气室温度短期稳定度优于±5 mK,长期稳定度优于±10 mK,为原子自旋陀螺仪的性能提升提供了可靠保障。

Abstract:

The atom spin gyroscope based on quantum precision measurement has the advantages of high accuracy, small size and low cost, which is considered to be the future development direction of the gyroscope. The core component of atomic spin gyroscope is the alkali vapor cell carrying the atom spin. The stability of the alkali vapor cells heating temperature is one of the important factors to determine the accuracy and sensitivity of atomic spin gyroscope. Meanwhile, the ultra-high sensitivity of the atomic spin gyroscope makes it extremely sensitive to magnetic field noise, so it should avoid introducing additional magnetic field interference by the electronic heater. For the above requirements, the non-magnetic heating system with high stability of temperature control and low interference magnetic is designed and optimized. A non-magnetic electric heating system consisting of temperature sensor Pt1000, film heater, SMU, DAQ card, sine wave generating circuit, driving circuit and the LabVIEW software platform, is established. The test results show that the equivalent interference magnetic field is within 15 fT/Hz1/2, the short-term stability of the alkali vapor cells temperature is ±5 mK, and the long-term stability is ±10mK, which provides reliability for the performance promotion of atomic spin gyroscope.