Investigation of Scintrex CG-6 Gravimeters in the Gravity Meter Calibration System Hannover

authored by: Ludger Timmen, Christian Rothleitner, Marvin Reich, Stephan Schröder, Matthias Cieslack
Abstract: A reliable evaluation of four Scintrex CG-6 gravimeters was done with respect to the stability of the calibration, measurement uncertainty, repeatability, and daily drift behaviour. An uncertainty on the 10 nm/s² level for adjusted g-results is striven for. Measurements were performed on the Vertical Gravimeter Calibration Line Hannover (VGCH, 192 μm/s² range, 20-storey building, 10 μm/s² interval, 2 · 10⁻⁴ expanded uncertainty of the scale). The achieved standard deviations of the adjusted calibration factors are in the order of 2 to 6 · 10⁻⁵, and the maximum variations between two calibration results for a single instrument varied between 2 to 7 · 10⁻⁴. Therefore, the stability of the scale factor (calibration) of a CG-6 instrument has to be controlled by the user before and after the microgravimetric survey. The transportation drift over some hours or a working day shows partly short-term variations with an impact of up to 100 nm/s² which can only be identified and controlled by sufficient repeated observations on same points. The manufacturer Scintrex Ltd. solved the problematic nature of an instrumental air pressure effect but a test especially for older CG gravimeters is still recommended. Overall, the CG-6 gravimeters meet fully the expectations.
Organisation(s): Institute of Geodesy
QuantumFrontiers
External Organisation(s): National Metrology Institute of Germany (PTB)
Helmholtz Centre Potsdam - German Research Centre for Geosciences (GFZ)
Landesamt für Vermessung und Geobasisinformation
Type: Article
Journal: AVN Allgemeine Vermessungs-Nachrichten
Volume: 127
Pages: 155-162
No. of pages: 8
ISSN: 0002-5968
Publication date: 2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Geography, Planning and Development, Civil and Structural Engineering, Earth and Planetary Sciences (miscellaneous)
Electronic version(s): https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003300 (Access: Closed)

BibTeX

@article{bc88ad7b59be4eecba435c9ca6e28221,
title = "Investigation of Scintrex CG-6 Gravimeters in the Gravity Meter Calibration System Hannover",
abstract = "A reliable evaluation of four Scintrex CG-6 gravimeters was done with respect to the stability of the calibration, measurement uncertainty, repeatability, and daily drift behaviour. An uncertainty on the 10 nm/s2 level for adjusted g-results is striven for. Measurements were performed on the Vertical Gravimeter Calibration Line Hannover (VGCH, 192 μm/s2 range, 20-storey building, 10 μm/s2 interval, 2 · 10−4 expanded uncertainty of the scale). The achieved standard deviations of the adjusted calibration factors are in the order of 2 to 6 · 10−5, and the maximum variations between two calibration results for a single instrument varied between 2 to 7 · 10−4. Therefore, the stability of the scale factor (calibration) of a CG-6 instrument has to be controlled by the user before and after the microgravimetric survey. The transportation drift over some hours or a working day shows partly short-term variations with an impact of up to 100 nm/s2 which can only be identified and controlled by sufficient repeated observations on same points. The manufacturer Scintrex Ltd. solved the problematic nature of an instrumental air pressure effect but a test especially for older CG gravimeters is still recommended. Overall, the CG-6 gravimeters meet fully the expectations.",
keywords = "Accuracy, Gravimeter calibration, Instrumental air pressure effect, Relative gravimetry, Scintrex CG-6, Transportation drift",
author = "Ludger Timmen and Christian Rothleitner and Marvin Reich and Stephan Schr{\"o}der and Matthias Cieslack",
note = "Funding Information: The Scintrex CG-6#171 gravimeter was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy – EXC – 2123 QuantumFrontiers – 390837967 in summer 2019. We thank Hans-Martin Schuler from IGM Messtechnik GmbH ({\"U}berlingen, Germany) for his support concerning questions and problems with Scintrex meters.",
year = "2020",
language = "English",
volume = "127",
pages = "155--162",
journal = "AVN Allgemeine Vermessungs-Nachrichten",
issn = "0002-5968",
publisher = "VDE Verlag GmbH",
number = "4",
}