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Dilatometer Setup to Characterize Dimensionally Stable Materials by the Coefficient of Thermal Expansion at a Temperature Range from 100 K to 325 K

Hamann, Ines and Spannagel, Ruven and Schuldt, Thilo and Sanjuan, Jose and Gohlke, Martin and Johann, Ulrich and Weise, Dennis and Braxmaier, Claus (2016) Dilatometer Setup to Characterize Dimensionally Stable Materials by the Coefficient of Thermal Expansion at a Temperature Range from 100 K to 325 K. DPG Tagung, 29. Februar - 04. März 2016, Hannover.

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Abstract

Space missions with the aim of high precision optical measurements are often limited by the dimensional stability of the instrument which can be exposed to high temperature fluctuations, due to the environment of the space probe. To minimize the change of the geometric dimension due to temperature changes, highly dimensionally stable materials are needed at the specific environmental temperatures. Materials like glass ceramics offer a minimal coefficient of thermal expansion (CTE) but they are also very heavy. Composite materials like CFRP or SiC offer also a very low CTE but with a lower weight and are more and more used for such applications. To characterize such low expansion materials we use a laser dilatometer with a heterodyne interferometer to measure length variations of the sample caused by an applied temperature variation. Using a cryocooler in combination with a heating system, we are able to determine CTEs at the 10 ppb/K level within a temperature range from 100 K to 325 K. In this talk, we present improvements of our setup and recent sample measurements.

Item URL in elib:https://elib.dlr.de/111127/
Document Type:Conference or Workshop Item (Speech)
Title:Dilatometer Setup to Characterize Dimensionally Stable Materials by the Coefficient of Thermal Expansion at a Temperature Range from 100 K to 325 K
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hamann, Inesdlr-ryUNSPECIFIED
Spannagel, Ruvendlr-ry, bremenUNSPECIFIED
Schuldt, Thilodlr-ry, bremenUNSPECIFIED
Sanjuan, Josedlr-ryUNSPECIFIED
Gohlke, Martindlr-ry, bremenUNSPECIFIED
Johann, Ulrichairbus ds gmbhUNSPECIFIED
Weise, Dennisairbus ds gmbhUNSPECIFIED
Braxmaier, Clausclaus.braxmaier (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Space Mission, optical measurements, CTE
Event Title:DPG Tagung
Event Location:Hannover
Event Type:national Conference
Event Dates:29. Februar - 04. März 2016
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
Institutes and Institutions:Institute of Space Systems > Systems Enabling Technologies
Deposited By: Hüls, Simone
Deposited On:14 Feb 2017 09:42
Last Modified:21 Mar 2017 11:57

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