Accuracy and stability evaluation of the 85Rb atom gravimeter WAG-H5-1 at the 2017 International Comparison of Absolute Gravimeters
Abstract
We report on the realization and evaluation of the 85Rb mobile atom absolute gravimeter named WAG-H5-1. With a distinctive Raman laser implementation, two new systematic errors, ac Stark shift imbalance and Raman laser chirp, are found and evaluated. The robustness of the instrument was tested during 1200 km-long transportation for the 10th International Comparison of Absolute Gravimeters at Beijing in October 2017. We acquire the degree of equivalence of 3 [ image ]Gal after the comparison. Its performance was further assessed by comparing with an absolute gravimeter (FG5X) in Wuhan. With high mobility and environmental adaptability, the gravimeter reaches a sensitivity of 30 [ image ]Gal (Hz)-1/2, stability of 1 [ image ]Gal@ 4000 s and accuracy within 10 [ image ]Gal.
- Publication:
-
Metrologia
- Pub Date:
- August 2019
- DOI:
- 10.1088/1681-7575/ab2f01
- Bibcode:
- 2019Metro..56d5012H
- Keywords:
-
- 85Rb;
- atom gravimeter;
- accuracy;
- stability