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12 July 2019 ZERODUR as a dimensionally stable mirror substrate material for spaceborne telescopes
Tony Hull, Antoine Carre, Ralf Jedamzik
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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 1118017 (2019) https://doi.org/10.1117/12.2535962
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece
Abstract
Demanding new environmental requirements for earth observation, and for astrophysics, may impose ultrastability requirements on telescope mirrors. Dimensional stability of the mirror material under environmental boundary conditions is as important to the success of a mission, if not more so, than considerations of strength and stiffness. Among these characteristics is the response of the mirror material to variable thermal stimulus. It is found that not only the mirror material’s coefficient of thermal expansion (CTE) is important, but also the homogeneity of the material characteristics. Furthermore the match of thermal characteristics between the mirror material and those of metering structure contributes to maintaining a manageable error budget for operations under various view factors to sun and earth.
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Tony Hull, Antoine Carre, and Ralf Jedamzik "ZERODUR as a dimensionally stable mirror substrate material for spaceborne telescopes", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 1118017 (12 July 2019); https://doi.org/10.1117/12.2535962
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KEYWORDS
Zerodur
Mirrors
Temperature metrology
Telescopes
Silicon carbide
Space telescopes
Space mirrors
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