Calibration of a superconducting gravimeter with an absolute atom gravimeter

authored by: S. Merlet, Pierre Gillot, Bing Cheng, Romain Karcher, Almazbek Imanaliev, Ludger Timmen, Franck Pereira dos Santos
Abstract: We present a 27-day-long common view measurement of an absolute cold atom gravimeter (CAG) and a relative iGrav superconducting gravimeter, which we use to calibrate the iGrav scale factor. This allowed us to push the CAG long-term stability down to the level of 0.5 nm s^{- 2}. We investigate the impact of the duration of the measurement on the uncertainty in the determination of the correlation factor and show that it is limited to about 3‰ by the coloured noise of our cold atom gravimeter. A 3-day-long measurement session with an additional FG5X absolute gravimeter allows us to directly compare the calibration results obtained with two different absolute meters. Based on our analysis, we expect that with an improvement of its long-term stability, the CAG will allow to calibrate the iGrav scale factor to better than the per mille level (1σ level of confidence) after only 1 day of concurrent measurements for maximum tidal amplitudes.
Organisation(s): Institute of Geodesy
CRC 1464: Relativistic and Quantum-Based Geodesy (TerraQ)
External Organisation(s): LNE-SYRTE - Observatoire de Paris
Type: Article
Journal: Journal of geodesy
Volume: 95
ISSN: 0949-7714
Publication date: 10.05.2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Geophysics, Geochemistry and Petrology, Computers in Earth Sciences
Electronic version(s): https://doi.org/10.1007/s00190-021-01516-6 (Access: Closed)

BibTeX

@article{e7546b80fb734427877cc8f195a11105,
title = "Calibration of a superconducting gravimeter with an absolute atom gravimeter",
abstract = "We present a 27-day-long common view measurement of an absolute cold atom gravimeter (CAG) and a relative iGrav superconducting gravimeter, which we use to calibrate the iGrav scale factor. This allowed us to push the CAG long-term stability down to the level of 0.5 nm s- 2. We investigate the impact of the duration of the measurement on the uncertainty in the determination of the correlation factor and show that it is limited to about 3‰ by the coloured noise of our cold atom gravimeter. A 3-day-long measurement session with an additional FG5X absolute gravimeter allows us to directly compare the calibration results obtained with two different absolute meters. Based on our analysis, we expect that with an improvement of its long-term stability, the CAG will allow to calibrate the iGrav scale factor to better than the per mille level (1σ level of confidence) after only 1 day of concurrent measurements for maximum tidal amplitudes.",
keywords = "Absolute atom gravimeter, Absolute free fall corner cube gravimeter, Relative superconducting gravimeter, Scale factor",
author = "S. Merlet and Pierre Gillot and Bing Cheng and Romain Karcher and Almazbek Imanaliev and Ludger Timmen and {Pereira dos Santos}, Franck",
note = "Funding Information: This research is carried on within the kNOW and ITOC projects, which acknowledges the financial support of the EMRP. The EMRP was jointly funded by the European Metrology Research Programme (EMRP) participating countries within the European Association of National Metrology Institutes (EURAMET) and the European Union. B.C. thanks the Labex First-TF for financial support. This work has been supported by the Paris {\^I}le-de-France R{\'e}gion in the framework of DIM SIRTEQ. ",
year = "2021",
month = may,
day = "10",
doi = "10.1007/s00190-021-01516-6",
language = "English",
volume = "95",
journal = "Journal of geodesy",
issn = "0949-7714",
publisher = "Springer Verlag",
number = "5",
}