Gravity field modelling for the Hannover 10 m atom interferometer
Autor: | Schilling, Manuel, Wodey, Étienne, Timmen, Ludger, Tell, Dorothee, Zipfel, Klaus H., Schlippert, Dennis, Schubert, Christian, Rasel, Ernst M., Müller, Jürgen, Institute of Geodesy, Leibniz University Hannover, Hannover, Germany, Institute of Quantum Optics, Leibniz University Hannover, Hannover, Germany |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
Atom interferometer Physics - Instrumentation and Detectors Atomic Physics (physics.atom-ph) FOS: Physical sciences 01 natural sciences ddc:526 Quantensensorik Physics - Atomic Physics 010309 optics Gravitational field Geochemistry and Petrology 0103 physical sciences gravimeter reference Calibration Astronomical interferometer ddc:550 ddc:530 Gravimetry Computers in Earth Sciences 010306 general physics Physics Satellitengeodäsie und geodätische Modellierung Gravimeter gravity acceleration Instrumentation and Detectors (physics.ins-det) Geodesy Metrology Interferometry Geophysics atom interferometry absolute gravimetry Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik |
Zdroj: | Journal of Geodesy 94 (2020), Nr. 12 |
DOI: | 10.15488/10717 |
Popis: | 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 for a new measurement standard in absolute gravimetry used as a reference with a potential stability up to 1 nm/s 2 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. Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347 Niedersächsisches Ministerium für Wissenschaft und Kultur http://dx.doi.org/10.13039/501100010570 https://www.bipm.org/kcdb |
Databáze: | OpenAIRE |
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