High-Precision Atom Interferometer-Based Dynamic Gravimeter Measurement by Eliminating the Cross-Coupling Effect

• Published in: Sensors (Basel, Switzerland) Switzerland), 2024-02, Vol.24 (3), p.1016
• Main Authors: Zhou, Yang, Wang, Wenzhang, Ge, Guiguo, Li, Jinting, Zhang, Danfang, He, Meng, Tang, Biao, Zhong, Jiaqi, Zhou, Lin, Li, Runbing, Mao, Ning, Che, Hao, Qian, Leiyuan, Li, Yang, Qin, Fangjun, Fang, Jie, Chen, Xi, Wang, Jin, Zhan, Mingsheng
• Format: Article
• Language: English
• Subjects: Accelerometers; Aircraft; atom interferometer; cold atom; dynamic gravimeter measurement; gravimeter; Gravity; high precision; Lasers; marine gravity survey; Measurement; Measuring instruments; Noise; Optical instruments; Sensors
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s24031016

A dynamic gravimeter with an atomic interferometer (AI) can perform absolute gravity measurements with high precision. AI-based dynamic gravity measurement is a type of joint measurement that uses an AI sensor and a classical accelerometer. The coupling of the two sensors may degrade the measurement precision. In this study, we analyzed the cross-coupling effect and introduced a recovery vector to suppress this effect. We improved the phase noise of the interference fringe by a factor of 1.9 by performing marine gravity measurements using an AI-based gravimeter and optimizing the recovery vector. Marine gravity measurements were performed, and high gravity measurement precision was achieved. The external and inner coincidence accuracies of the gravity measurement were ±0.42 mGal and ±0.46 mGal after optimizing the cross-coupling effect, which was improved by factors of 4.18 and 4.21 compared to the cases without optimization.