Comparison of 3 absolute gravimeters based on different methods for the e-MASS project

TL;DR

This paper compares three absolute gravimeters using optical and atomic interferometry methods to evaluate their performance and consistency in measuring gravitational acceleration for precision metrology.

Contribution

It provides a direct comparison of three different absolute gravimeters, highlighting their differences, similarities, and measurement consistency in a practical metrology context.

Findings

All three gravimeters produced consistent measurements within their uncertainties.

Differences between methods are characterized and discussed.

Results support the reliability of optical and atomic interferometry for precise gravity measurements.

Abstract

We report on the comparison between three absolute gravimeters that took place in April 2010 at Laboratoire National de M\'etrologie et d'Essais. The three instruments (FG5#209 from METAS, Switzerland, IMGC-02 from INRIM, Italy, and CAG from LNE-SYRTE, France) rely on different methods: optical and atomic interferometry. We discuss their differences as well as their similarities. We compare their measurements of the gravitational acceleration in 4 points of the same pillar, in the perspective of an absolute determination of g for a watt balance experiment