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Laser-interferometric dilatometry

Spannagel, Ruven (2017) Laser-interferometric dilatometry. Dissertation, Universität Bremen.

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Abstract

Highly dimensionally stable materials and structures are particularly needed in optical systems such as ultra precise optical clocks, as well as materials with excellent dimensional stability and light weight properties for space applications such as telescopes, optical benches, and optical resonators. Also, the dimensional stability of mounting technologies of materials with different properties is of high interest for such applications. Glass ceramics and composite materials can be tuned to reach a very low coeffcient of thermal expansion (CTE) at different temperatures, enabling best stability in the operating temperature for certain applications. In order to determine the CTE of such highly stable materials, very accurate set-ups are needed. In this thesis, metrology set-ups to measure the CTE of a large variety of material samples are designed, realized and verifed, measuring dimensionally stable glass ceramics. The set-ups are able to characterize tube shaped samples at a temperature range of 140K to 333 K. Due to our unique mirror mount design all kind of materials can be characterized. The optical dilatometer set-ups are based on a heterodyne interferometer with a displacement sensitivity at the sub-nanometer level. This instrument is used to measure the expansion of a sample when applying controlled small amplitude temperature signals. A carbon fiber reinforced polymer (CFRP) sample was characterized where CTE levels of 10

Item URL in elib:https://elib.dlr.de/115006/
Document Type:Thesis (Dissertation)
Title:Laser-interferometric dilatometry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Spannagel, Ruvenruven.spannagel (at) dlr.deUNSPECIFIED
Date:4 October 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:optical Dilatometer, optical clocks
Institution:Universität Bremen
Department:Fachbereich Produktionstechnik
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Systems Engineering Optische Systeme
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systems Enabling Technologies
Deposited By: Hüls, Simone
Deposited On:10 Jan 2018 11:29
Last Modified:07 Feb 2018 12:50

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