用于动态原子重力仪的量子化轴磁场设计与实验验证  

Design and Experimental Verification of Quantized Axis Magnetic Field for Dynamic Atomic Gravimeter

作　　者：李军强 马思迁 陈新文 周超 LI Jun-qiang;MA Si-qian;CHEN Xin-Wen;ZHOU Chao(Huazhong Institute of Electro-Optics-Wuhan National Laboratory for Optoelectronics,Wuhan 430223,China)

机构地区：[1]华中光电技术研究所-武汉光电国家研究中心,湖北武汉430223

出　　处：《光学与光电技术》2024年第6期129-136,共8页Optics & Optoelectronic Technology

基　　金：国防基础科研计划项目资助。

摘　　要：在基于π-π/2-π的双光子拉曼跃迁的原子干涉中,量子化轴磁场与拉曼光波矢方向的相对角度偏差及其空间均匀性和时间稳定性是影响原子干涉仪的关键因素。采用三轴正交的亥姆霍兹线圈用来补偿动态环境下原子重力仪磁量子化轴方向与拉曼光波矢的角度偏离,并基于comsol仿真计算了不同角度下各轴线圈的驱动电流及干涉区的磁场梯度,利用模拟PID+扰动抑制的控制策略来控制恒流源驱动三轴线圈,提高量子化轴磁场的长期稳定性。实验验证了三轴亥姆霍兹线圈补偿磁量子化轴的可行性,实现了在干涉区磁量子化轴的方向控制以及扰动不超过3 mGs的磁场梯度,为研制动态原子重力仪奠定了技术基础,并对以双光子拉曼跃迁为基础的动态原子干涉仪具有一定的参考意义。In atomic interference based on two-photon Raman transitions,the relative angular deviation between the magnetic field of the quantization axis and the direction of the Raman light wave vector,as well as its spatial uniformity and temporal stability,are the key factors affecting the atomic interferometer.In this paper,a triaxial orthogonal Helmholtz coil is used to compensate for the angular deviation between the magnetic quantization axis direction of the atomic gravimeter and the Raman light wave vector in a dynamic environment,and the driving current of each axis coil and the magnetic field gradient in the interference region are calculated based on COMSOL simulation.The control strategy of simulated PID+disturbance suppression is used to control the constant current source to drive the triaxial coil to improve the long-term stability of the magnetic field of the quantized axis.The experiments verify the feasibility of the three-axis Helmholtz coil to compensate the magnetic quantization axis,and realize the direction control of the magnetic quantization axis in the interference region and the magnetic field gradient with the perturbation not exceeding 3 mGs,which lays a technical foundation for the development of dynamic atomic gravimeter and has certain reference significance for dynamic atomic interferometer based on two-photon Raman transition.

关 键 词：磁量子化轴 双光子跃迁 动态原子重力仪 恒流源 磁场梯度 

分 类 号：P223.1[天文地球—大地测量学与测量工程]