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Evaluation of the diffraction correction during the 10th International Comparison of Absolute Gravimeters (ICAG-2017)
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Paper Abstract

The curved wavefronts of a Gaussian beam used in absolute gravimeters introduce a systematic error in the measured gravity value. Diffraction correction is defined to denote the correction of the error. This paper presents an evaluation of the diffraction correction for some absolute gravimeters participated in the 10th International Comparison of Absolute Gravimeters. An automatic M2-measurement instrument is introduced to achieve an efficient and accurate measurement of the beam waist diameter. On the basis, the diffraction corrections are calculated and estimated. The results indicate that the waist diameter of two laser beams deviates from the typical value. After optimized, the diffraction corrections of all the estimated AGs are less than 2.4 μGal. The accuracy of the correction is better than 0.1 μGal. This work is of great significance for improving the accuracy of the gravity measurements in the comparison.

Paper Details

Date Published: 7 March 2019
PDF: 6 pages
Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110532S (7 March 2019); doi: 10.1117/12.2512025
Show Author Affiliations
Qiyu Wang, National Institute of Metrology (China)
Jinyang Feng, National Institute of Metrology (China)
Shanliang Liu, National Institute of Metrology (China)
Duowu Su, National Institute of Metrology (China)
Chunjian Li, National Institute of Metrology (China)
Shuqing Wu, National Institute of Metrology (China)

Published in SPIE Proceedings Vol. 11053:
Tenth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Jie Lin, Editor(s)

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