Absolute measurements of the free-fall acceleration in Esch-sur-Alzette, Belval, Luxembourg EURAMET.M.G-K2 2015

The described work was carried out on November 2015 by the Istituto Nazionale di Ricerca Metrologica (INRiM) of Turin (Italy), for the participation of the IX Regional Comparison of Absolute Gravimeters EURAMET.M.G-K2 (former ECAG2015) in the dedicated laboratory of Belval centre, in Esch-sur-Alzette, Luxembourg, organized by the University of Luxembourg. The experimental results of the absolute measurement of the free-fall acceleration g in the three sites dedicated to the comparison are reported. The measurements were performed with the transportable absolute gravimeter IMGC-02 of the INRiM. At the same time, 20 other absolute gravimeters coming for different parts of the Europe and United States were used for the comparison. In the proximity of the measurement sites, a relative gravimeter and an absolute one were enabled to monitor the variation of the gravitation field along the days. With the IMGC-02 instrument a relative accuracy of few parts in 109 is reachable, i.e. measurement of g with uncertainty of tens microgals (1 μGal = 1 × 10−8 m s−2). ∼ ·