A Vibration Compensation Approach for Atom Gravimeter Based on Improved Sparrow Search Algorithm

Abstract

Atom gravimeter (AG) is a kind of high-precision absolute gravimeter based on atom interference, which can measure absolute gravitational acceleration. Vibration is one of the important factors which limits measurement accuracy. Vibration compensation is an effective method to reduce the impact of vibration on measurement accuracy and it is especially suitable for complex vibration environments. In this article, an improved vibration compensation method is proposed. Based on the simplified model of the vibration transfer function, the method searches for the optimal parameters through an improved chaotic sparrow search algorithm (CSSA) to effectively restore the real vibration of the Raman mirror and achieve the best compensation effect. The experimental results show that the improved method proposed in this article can achieve better compensation effectiveness in less calculation time than the previous methods. The modified atom interference fringe fitting uncertainty can attenuate by 70.21%, and the search time is reduced by nearly six times, effectively improving the accuracy and stability of the AG measurement. This method can correct the interference fringes in time when the environment changes, which provides a new idea for the design of the vibration compensation method considering dynamic gravimetry with AG.