Cost-optimized methods extending the solution space of lightweight spaceborne monolithic ZERODUR(R) mirrors to larger sizes

Antoine Leys; Tony Hull; Thomas Westerhoff

doi:10.1117/12.2187099

2 September 2015 Cost-optimized methods extending the solution space of lightweight spaceborne monolithic ZERODUR® mirrors to larger sizes

Antoine Leys, Tony Hull, Thomas Westerhoff

Author Affiliations +

Proceedings Volume 9573, Optomechanical Engineering 2015; 95730E (2015) https://doi.org/10.1117/12.2187099
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

We address the problem that larger spaceborne mirrors require greater sectional thickness to achieve a sufficient first eigen frequency that is resilient to launch loads, and to be stable during optical telescope assembly integration and test, this added thickness results in unacceptable added mass if we simply scale up solutions for smaller mirrors. Special features, like cathedral ribs, arch, chamfers, and back-side following the contour of the mirror face have been considered for these studies. For computational efficiency, we have conducted detailed analysis on various configurations of a 800 mm hexagonal segment and of a 1.2-m mirror, in a manner that they can be constrained by manufacturing parameters as would be a 4-m mirror. Furthermore each model considered also has been constrained by cost-effective machining practice as defined in the SCHOTT Mainz factory. Analysis on variants of this 1.2-m mirror has shown a favorable configuration. We have then scaled this optimal configuration to 4-m aperture. We discuss resulting parameters of costoptimized 4-m mirrors. We also discuss the advantages and disadvantages this analysis reveals of going to cathedral rib architecture on 1-m class mirror substrates.

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Antoine Leys, Tony Hull, and Thomas Westerhoff "Cost-optimized methods extending the solution space of lightweight spaceborne monolithic ZERODUR® mirrors to larger sizes", Proc. SPIE 9573, Optomechanical Engineering 2015, 95730E (2 September 2015); https://doi.org/10.1117/12.2187099

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