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Differential common path interferometry for picometre surface metrology

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


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/
Document Type:Conference or Workshop Item (Poster)
Title:Differential common path interferometry for picometre surface metrology
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schulte, AlexanderAirbus DS GmbHUNSPECIFIED
Sell, AlexanderAirbus DS-Space, FriedrichshafenUNSPECIFIED
Kögel, Haraldharald.koegel (at) astrium.eads.netUNSPECIFIED
Weise, DennisAirbus DS, FriedrichtshafenUNSPECIFIED
Braxmaier, Clausclaus.braxmaier (at) dlr.deUNSPECIFIED
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 ISI Web of Science:No
DOI :10.1117/12.2600308
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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