Influence of Group Temperature on Fringe Contrast of Atomic Interference Gyroscope
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.
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