Publication Date:
2021-11-29
Description:
The 8th International Comparison of Absolute Gravimeters (ICAG2009) took place at the headquarters
of the International Bureau of Weights and Measures (BIPM) from September to October 2009. It was
the first ICAG organized as a key comparison in the framework of the CIPM Mutual Recognition
Arrangement of the International Committee for Weights and Measures (CIPM MRA) (CIPM 1999).
ICAG2009 was composed of a Key Comparison (KC) as defined by the CIPM MRA, organized by the
Consultative Committee for Mass and Related Quantities (CCM) and designated as CCM.G-K1.
Participating gravimeters and their operators came from national metrology institutes (NMIs) or their
designated institutes (DIs) as defined by the CIPM MRA. A Pilot Study (PS) was run in parallel in order
to include gravimeters and their operators from other institutes which, while not signatories of the CIPM
MRA, nevertheless play important roles in international gravimetry measurements. The aim of the CIPM
MRA is to have international acceptance of the measurement capabilities of the participating institutes in
various fields of metrology. The results of CCM.G-K1 thus constitute an accurate and consistent gravity
reference traceable to the SI (International System of Units), which can be used as the global basis for
geodetic, geophysical and metrological observations of gravity. The measurements performed afterwards
by the KC participants can be referred to the international metrological reference, i.e. they are
SI-traceable.
The ICAG2009 was complemented by a number of associated measurements: the Relative Gravity
Campaign (RGC2009), high-precision levelling and an accurate gravity survey in support of the BIPM
watt balance project. The major measurements took place at the BIPM between July and October 2009.
Altogether 24 institutes with 22 absolute gravimeters32 and nine relative gravimeters participated in the
ICAG/RGC campaign.
This paper is focused on the absolute gravity campaign. We review the history of the ICAGs and
present the organization, data processing and the final results of the ICAG2009.
After almost thirty years of hosting eight successive ICAGs, the CIPM decided to transfer the
responsibility for piloting the future ICAGs to NMIs, although maintaining a supervisory role through its
Consultative Committee for Mass and Related Quantities.
Description:
Published
Description:
666–684
Description:
2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
Description:
JCR Journal
Description:
restricted
Keywords:
absolute gravimetry
;
International Comparison
;
05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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