原子团温度对原子干涉陀螺条纹对比度的影响  

Influence of Group Temperature on Fringe Contrast of Atomic Interference Gyroscope

作　　者：赵文武 徐瑜浓 邓敏 ZHAO Wenwu;XU Yunong;DENG Min(Hunan Gaodi Photoelectric Technology Development Co.,Ltd.,Changsha,Hunan 410073,China)

机构地区：[1]湖南高地光电科技发展有限公司,湖南长沙410073

出　　处：《自动化应用》2024年第11期7-11,共5页Automation Application

摘　　要：原子干涉陀螺是基于冷原子物质波Sagnac效应测量相对于惯性参考系的转动角速度的一种陀螺仪,其转动时会在2条干涉传播路径之间额外产生相移,该转动相移中包含了垂直于拉曼光方向的纵向速度分量。一般认为入射原子团的纵向速度分布是导致原子陀螺干涉信号强度减弱和条纹对比度下降的最主要因素,但这忽略了与拉曼光方向平行的横向速度分布的影响。通过建立原子干涉陀螺的简单数学模型,定量分析2种分布对相同转速的影响程度,发现横向速度分布对最终干涉条纹质量非常关键,其比纵向速度分布容忍度更低。这要求在设计原子干涉陀螺系统时,需要更重视原子团的横向冷却效率,而不是只关注和转动相移相关的纵向速度分布部分。Atomic interference gyroscope is a type of gyroscope that measures the rotational angular velocity relative to an inertial reference frame based on the Sagnac effect of cold atomic matter waves.Its rotation generates an additional phase shift between two interference propagation paths,which includes a longitudinal velocity component perpendicular to the direction of Raman light.It is generally believed that the longitudinal velocity distribution of incident atomic clusters is the main factor leading to a decrease in the intensity of atomic gyroscope interference signals and a decrease in fringe contrast,but this ignores the influence of the transverse velocity distribution parallel to the direction of Raman light.By establishing a simple mathematical model of atomic interferometric gyroscopes and quantitatively analyzing the degree of influence of two distributions on the same rotational speed,it is found that the transverse velocity distribution is crucial for the quality of the final interference fringes,and its tolerance is lower than that of the longitudinal velocity distribution.This requires that when designing an atomic interference gyroscope system,more attention should be paid to the lateral cooling efficiency of atomic clusters,rather than only focusing on the longitudinal velocity distribution related to rotational phase shift.

关 键 词：原子干涉陀螺 纵向速度分布 横向速度分布 条纹对比度 

分 类 号：TH824[机械工程—仪器科学与技术]