MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
Degrees of equivalence: Dk and expanded uncertainty Uk (k = 2), both expressed in µGal
Comparison of these degrees of equivalence with those obtained in previous exercises is given in Section 9 of the Final Report. It shows good agreement.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO-31-0 Annex B Rule B.
Metrology area, Sub-field | Mass and related quantities, Gravity |
Description | Free-fall acceleration |
Time of measurements | 2011 |
Status | Approved for equivalence |
Final Reports of the comparisons | |
Measurand | Free-fall acceleration: 9.81 m/s2 The non-SI unit "Gal" is normally used in this field: 1 Gal = 10-2 m/s2 |
Transfer device | Comparison of absolute gravimeters at the Underground Laboratory for Geodynamics in Walferdange, Luxemburg |
Comparison type | Key Comparison |
Consultative Committee | CCM (Consultative Committee for Mass and Related Quantities) |
Conducted by | EURAMET (European Association of National Metrology Institutes) |
RMO Internal Identifier | EURAMET Project No 1186 |
Comments | Results published on 22 October 2012 Free-fall acceleration |
Pilot institute |
METAS
Federal Institute of Metrology Switzerland |
Contact person | Henri BAUMANN +41 (0) 31 32 33 243 |
Pilot laboratory | |
---|---|
METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
FGI |
Finnish Geospatial Research Institute, Finland, EURAMET |
INRIM |
Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET |
LNE-SYRTE |
Observatoire de Paris/Systèmes de Référence Temps-Espace; now: Observatoire de Paris/Laboratoire Temps Espace (LNE-OP), France, EURAMET |
VUGTK/RIGTC |
Research Institute of Geodesy, Topography and Cartography, Czechia, EURAMET |
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MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
The data processing is explained in Section 7 of the Final Report and is based on a global weighted least-square adjustement of the measurements after correction for self-attraction, laser beam diffraction and Superconducing Gravimeter observations. This makes it possible to evaluate the gravity value Gj at each Station j, as well as the offset Dk for absolute gravimeter AG(k), and associated expanded uncertainties (k = 2). |
The degree of equivalence of absolute gravimeter AG(k) is given by a pair of terms: Dk and Uk, its expanded uncertainty with coverage factor equal to 2, both expressed in µGal. |
MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
Raw measurements from Absolute Gravimeters are given in Table 3 of the Final Report.