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Theory and practice of moving mass (Newtonian) calibration of tilt and gravity meters

Authors

Benedek,  Judit
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Meurers,  Bruno
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Leonhardt,  Roman
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Papp,  Gábor
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ruotsalainen,  Hannu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Benedek, J., Meurers, B., Leonhardt, R., Papp, G., Ruotsalainen, H. (2023): Theory and practice of moving mass (Newtonian) calibration of tilt and gravity meters, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4652


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021061
Abstract
Probably the moving mass calibration (MMC) apparatus built in the underground Mátyáshegy Gravity and Geodynamics Laboratory Budapest has been used most extensively and several spring type instruments (LaCoste&Romberg and Scintrex gravimeters) have been investigated and calibrated by it. Its test mass is a cylindrical ring having a weight of 3 tons.The same principle and technology can be used to test compact tilt sensors having nanoradian resolution capability. Up to now rigorous testing methods below microradian range were not available in practice. The analysis of the so called off-axis variation of the gravitational vector generated by the vertical movement of the cylindrical ring mass of the Mátyáshegy MMC device, however, showed that a sufficiently accurate reference signal having (15±0.02) nrad peak-to-peak amplitude can be provided for calibration. It is just in the range of the tilt induced by earth tide effect, which is a “standard” signal component in the time series recorded in observatory environment. In the first part of the presentation a discussion of the proposed methodology of tilt meter calibration is given. Then results of the physical experiments dedicated to the support of the theory is shown. Special attention is payed for the investigation of some factors (mass heterogenities of the test mass, magnetic effects, etc...) influencing the accuracy of the calibration.