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Gravity field modelling for the Hannover 10 m atom interferometer

Schilling, Manuel and Wodey, Étienne and Timmen, Ludger and Tell, Dorothee and Zipfel, Klaus and Schlippert, Dennis and Schubert, Christian and Rasel, Ernst and Müller, Jürgen (2020) Gravity field modelling for the Hannover 10 m atom interferometer. Journal of Geodesy, 94 (12), p. 122. Springer. doi: 10.1007/s00190-020-01451-y. ISSN 0949-7714.

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Official URL: https://link.springer.com/article/10.1007/s00190-020-01451-y


Absolute gravimeters are used in geodesy, geophysics, and physics for a wide spectrum of applications. Stable gravimetric measurements over timescales from several days to decades are required to provide relevant insight into geophysical processes. Users of absolute gravimeters participate in comparisons with a metrological reference in order to monitor the temporal stability of the instruments and determine the bias to that reference. However, since no measurement standard of higher-order accuracy currently exists, users of absolute gravimeters participate in key comparisons led by the International Committee for Weights and Measures. These comparisons provide the reference values of highest accuracy compared to the calibration against a single gravimeter operated at a metrological institute. The construction of stationary, large scale atom interferometers paves the way towards a new measurement standard in absolute gravimetry used as a reference with a potential stability up to 1 nm/s² at 1 s integration time. At the Leibniz University Hannover, we are currently building such a very long baseline atom interferometer with a 10 m long interaction zone. The knowledge of local gravity and its gradient along and around the baseline is required to establish the instrument´s uncertainty budget and enable transfers of gravimetric measurements to nearby devices for comparison and calibration purposes. We therefore established a control network for relative gravimeters and repeatedly measured its connections during the construction of the atom interferometer. We additionally developed a 3D model of the host building to investigate the self-attraction effect and studied the impact of mass changes due to groundwater hydrology on the gravity field around the reference instrument. The gravitational effect from the building 3D model is in excellent agreement with the latest gravimetric measurement campaign which opens the possibility to transfer gravity values with an uncertainty below the 10 nm/s² level.

Item URL in elib:https://elib.dlr.de/136785/
Document Type:Article
Title:Gravity field modelling for the Hannover 10 m atom interferometer
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schilling, ManuelUNSPECIFIEDhttps://orcid.org/0000-0002-9677-0119UNSPECIFIED
Wodey, ÉtienneInstitut für Quantenoptik, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0001-9522-8558UNSPECIFIED
Timmen, LudgerInstitut für Erdmessung, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0003-2334-5282UNSPECIFIED
Tell, DorotheeInstitut für Quantenoptik, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0002-2793-7982UNSPECIFIED
Zipfel, KlausInstitut für Quantenoptik, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0002-3135-1247UNSPECIFIED
Schlippert, DennisInstitut für Quantenoptik, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0003-2168-1776UNSPECIFIED
Rasel, ErnstInstitut für Quantenoptik, Leibniz Universität Hannover, GermanyUNSPECIFIEDUNSPECIFIED
Müller, JürgenInstitut für Erdmessung, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0003-1247-9525UNSPECIFIED
Journal or Publication Title:Journal of Geodesy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 122
Keywords:atom interferometry, gravity acceleration, absolute gravimetry, gravimeter reference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Hannover
Institutes and Institutions:Institute for Satellite Geodesy and Inertial Sensing > Satellite Geodesy and Geodetic Modelling
Institute for Satellite Geodesy and Inertial Sensing > Quantum Sensing
Deposited By: Schilling, Manuel
Deposited On:14 Dec 2020 11:34
Last Modified:23 Oct 2023 12:32

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