Schulte, 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, 30. Mrz. - 02. Apr. 2020, 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 Dates: | 30. Mrz. - 02. Apr. 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: | 26 Sep 2021 22:57 |
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