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Proceedings Paper

The mounting system of lenses in ASPIICS coronagraph
Author(s): Martin Veselý; Tomáš Vít; Jan Pleštil
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Paper Abstract

This article describes the mounting system of lenses in a coronagraph ASPIICS (Association of Spacecraft for Polarimetric Imaging Investigation of the Corona of the Sun). ASPIICS is developed and produced in cooperation of twenty partners from seven countries. It is a part of the ESA's PROBA-3 mission, which includes a formation flight of a pair of satellites at orbit. Coronagraph itself consists of three objectives, where the last one is composed by one objective tube for each lens plus holder and Lyot stop. To achieve high accuracy of mounting of the individual lenses, it was necessary to achieve tight geometric and dimensional tolerances for manufacturing of the objectives barrels. In order to minimize the stress and to prevent the displacement of the lens from ideal position during a temperature change on orbit, an athermal solution was proposed. This is achieved by inserting a Teflon ring of a suitable thickness between the lens surface, objective barrel and the spring washer with a precisely defined contact force. It was necessary to find a suitable technological process of manufacturing, because of the specific behavior of PTFE during turning and complex design of other parts. All parameters of mounting system were repeatedly verified by a thermomechanical analysis in FEM software, based on tests of real parts.

Paper Details

Date Published: 11 November 2016
PDF: 6 pages
Proc. SPIE 10151, Optics and Measurement International Conference 2016, 101510V (11 November 2016); doi: 10.1117/12.2257230
Show Author Affiliations
Martin Veselý, The Czech Academy of Sciences (Czech Republic)
Tomáš Vít, Technical Univ. of Liberec (Czech Republic)
Jan Pleštil, The Czech Academy of Sciences (Czech Republic)

Published in SPIE Proceedings Vol. 10151:
Optics and Measurement International Conference 2016
Jana Kovacicinova, Editor(s)

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