The Gravity Field in Force Standard Machines

M. Schilling, L. Timmen, R. Kumme

Abstract

The gravity acceleration g plays an important role in several physical quantities as provided by National Metrology Institutes. The unit of force is realized in dependence on <i>g</i> in force standard machines (FSM). We present the results of the combination of forward modeling and gravimetric observations to determine the absolute value of <i>g</i> inside the new 200 kN FSM of the Physikalisch-Technische Bundesanstalt (PTB). A model of the machine itself and gravimetric measurements, performed prior and after the installation of the FSM, are compared. The agreement is within 10 nm/s². The final uncertainty concerning <i>g</i> is 1.2 &times; 10^-7 due to temporal variations typically neglected in force measurements.

Keywords

gravity, force standard machine, gravimetry, forward gravity modelling

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IMEKO-TC3-2017-044.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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