一种基于光阱力的原子加速度计方案  

Scheme for Optical-Trap-Force-Based Atomic Accelerometer

作　　者：何思璇 吴德伟[1] 苗强[1] He Sixuan;Wu Dewei;Miao Qiang(College of Information and Navigation,Air Force Engineering University,Xi'an,Shaanxi 710077,China)

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《激光与光电子学进展》2020年第17期213-219,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61573372,61603413);陕西省自然科学基础研究计划(2017JM6017)。

摘　　要：惯性导航具有自主性强,隐蔽性好,全天候、全天时工作等优点,成为战略、战术武器不可或缺的核心导航方式,同时对惯性器件提出了高精度的要求。基于光阱力的原子加速度计为闭环系统,由于结构中没有机械连接,弹性支撑部分的摩擦阻尼对测量结果的影响较小,具有抗干扰能力强、精度高等优点,是实现小型化高精度加速度计的有效方案。根据瑞利散射模型,建立了单轴双光束加速度计的力学模型,并进行了数值仿真。同时分析并仿真了激光波长、聚焦程度等光阱参数对光阱力的影响。通过对加速度计的灵敏度分析,对参数进行了优化,得到了10^-7g·nm^-1(g=10 m·s^-2)的测量灵敏度。研究结果表明,基于光阱力的原子加速度计具有较高的测量精度。Inertial navigation has the advantages of strong autonomy,good concealment,all-weather and all-time work,so it becomes an indispensable core navigation mode in strategic and tactical weapons,which in turn puts forward high precision requirements for inertial devices.The optical-trap-force-based atomic accelerometer adopts the closed-loop system and the influence of the friction damping of elastic support elements on the measurement results is small because there is no mechanical connection in the structure,and thus it possesses the advantages of strong anti-interference ability and high precision,which is effective to realize the miniaturization of a high precision accelerometer.According to the Rayleigh scattering model,we establish the mechanical model of the single-axis double-beam accelerometer and conduct the numerical simulation.In addition,we analyze and simulate the influence of laser wavelength,focusing degree and other optical-trap parameters on optical-trap force.Through the sensitivity analysis of the accelerometer,the parameters are optimized to obtain the measurement sensibility of 10^-7g·nm^-1(g=10 m·s^-2).The research results show that the optical-trap-force-based atomic accelerometer has a relatively high measurement precision.

关 键 词：激光光学 光阱力 惯性导航 原子加速度计 瑞利散射 灵敏度分析 

分 类 号：TN249[电子电信—物理电子学]