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Proceedings Paper

SOFIA primary mirror assembly: structural properties and optical performance
Author(s): Hermann Bittner; Matthias Erdmann; Peter Haberler; Karl-Heinz Zuknik
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Paper Abstract

The primary mirror assembly is the key opto-mechanical subsystem of the airborne SOFIA telescope. It consists of a 2.7-m primary mirror and a mirror support structure, the so-called primary mirror cell. The mirror is a monolithic ele-ment of Zerodur with a milled honeycomb structure on the backside. Despite of its size it has a mass of approx. 885 kg only. The mirror cell is a lightweight structure made from CFRP panels and profiles, bonded and riveted together with metallic inserts and joints. It provides an isostatic but stiff mounting of the mirror. The first natural frequencies are pre-dicted to be above 70 Hz for the whole 2000-kg assembly. The paper presents the actual structural properties of the primary mirror assembly determined in a modal survey test as well as the optical performance of the mirror mounted in the cell measured in horizontal and vertical orientation of the optical axis.

Paper Details

Date Published: 3 March 2003
PDF: 8 pages
Proc. SPIE 4857, Airborne Telescope Systems II, (3 March 2003); doi: 10.1117/12.458636
Show Author Affiliations
Hermann Bittner, Kayser-Threde GmbH (Germany)
Matthias Erdmann, Kayser-Threde GmbH (Germany)
Peter Haberler, Kayser-Threde GmbH (Germany)
Karl-Heinz Zuknik, Kayser-Threde GmbH (Germany)


Published in SPIE Proceedings Vol. 4857:
Airborne Telescope Systems II
Ramsey K. Melugin; Hans-Peter Roeser, Editor(s)

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