The Gravity Field in Force Standard Machines

• 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 g in force standard machines (FSM). We present the results of the combination of forward modeling and gravimetric observations to determine the absolute value of g 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 g is 1.2 × 10^-7 due to temporal variations typically neglected in force measurements.
• Keywords:

  gravity, force standard machine, gravimetry, forward gravity modelling
• Download:

  IMEKO-TC3-2017-044.pdf
• DOI:

  _unreg_tc3-2017.044

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