Schultze, Alexander and Sell, Alexander and Kögel, Harald and Weise, Dennis and Braxmaier, Claus (2021) Differential common path interferometry for picometre surface metrology. In: Proceedings of SPIE - The International Society for Optical Engineering, 11852. International Conference on Space Optics, 2020-03-30 - 2020-04-02, Online. doi: 10.1117/12.2600308. ISSN 0277-786X.
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Official URL: http://dx.doi.org/10.1117/12.2600308
Abstract
Future space based missions for gravitational wave research call for an improved inertial reference sensor with acceleration noise levels of fm/s^(2). Spherical test masses can enable increased performance by suspension-free operation, contrary to cuboid solutions suffering from cross-coupling of attitude control noise. However, interferometric readout is affected by surface irregularities and test mass tumbling [Gerardi et al. 2014]. An accurate surface map for compensation must be established for compensation, either by characterisation a priori or in flight, when optical path length changes due to surface occur in the measurement band. We demonstrate a method for generating a surface map of a spherical body with optical point sensors using a differential method to suppress common mode errors present, taking advantage of the excellent performance of heterodyne interferometry at sub-nanometer levels. A measurement setup is proposed in which two beams of a Nd:YAG Michelson interferometer are used to scan the surface, which is afterwards reconstructed from the differential measurement. Such a method could potentially benefit other research areas, such as the precise determinations of the Avogadro constant [Azuma et al. 2015] or aspheric surface metrology.
Item URL in elib: | https://elib.dlr.de/144098/ | ||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | ||||||||||||||||||||||||
Title: | Differential common path interferometry for picometre surface metrology | ||||||||||||||||||||||||
Authors: |
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Date: | 21 June 2021 | ||||||||||||||||||||||||
Journal or Publication Title: | Proceedings of SPIE - The International Society for Optical Engineering | ||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||
Volume: | 11852 | ||||||||||||||||||||||||
DOI: | 10.1117/12.2600308 | ||||||||||||||||||||||||
ISSN: | 0277-786X | ||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||
Keywords: | Interferometrie, Oberflächen-Metrologie | ||||||||||||||||||||||||
Event Title: | International Conference on Space Optics | ||||||||||||||||||||||||
Event Location: | Online | ||||||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||||||
Event Start Date: | 30 March 2020 | ||||||||||||||||||||||||
Event End Date: | 2 April 2020 | ||||||||||||||||||||||||
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: | Bremen , Ulm | ||||||||||||||||||||||||
Institutes and Institutions: | Institute of Quantum Technologies > Quantum Metrology Institute of Space Systems > Systems Enabling Technologies | ||||||||||||||||||||||||
Deposited By: | Hamann, Ines | ||||||||||||||||||||||||
Deposited On: | 26 Sep 2021 22:57 | ||||||||||||||||||||||||
Last Modified: | 24 Apr 2024 20:43 |
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