Development of a three-mirror anastigmat telescope for the GERB experiment

Pierre Gloesener; Eric Quertemont; Carlo Flebus

doi:10.1117/12.2307913

21 November 2017 Development of a three-mirror anastigmat telescope for the GERB experiment

Pierre Gloesener, Eric Quertemont, Carlo Flebus

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Proceedings Volume 10569, International Conference on Space Optics — ICSO 2000; 105691W (2017) https://doi.org/10.1117/12.2307913
Event: International Conference on Space Optics 2000, 2000, Toulouse Labège, France

Abstract

The GERB experiment, on-board Meteosat Second Generation, aims at monitoring the Earth radiation budget within a broad spectral range (0.32 –30 ‡m). This paper outlines the development of the GERB imaging subsystem, a f/2 three-mirror anastigmat telescope with a 18° x 0,28° rectangular field-of-view. The telescope is an all-aluminium design, comprising a primary off-axis elliptical mirror and two spherical ones, with a largest size of 100 mm. After integration and environmental testing, its global on-axis imaging performance reached 0,45 ‡ rms at 633 nm for an optical design value of 0,27 ‡ rms. The global opto-mechanical tolerance analysis of the design phase defined an integration sequence able to keep the individual alignment of each mirror within the accuracy needed to ascertain the whole telescope quality.

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Pierre Gloesener, Eric Quertemont, and Carlo Flebus "Development of a three-mirror anastigmat telescope for the GERB experiment", Proc. SPIE 10569, International Conference on Space Optics — ICSO 2000, 105691W (21 November 2017); https://doi.org/10.1117/12.2307913

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KEYWORDS

Telescopes

Mirrors

Tolerancing

Wavefronts

Phase modulation

Optical instrument design

Control systems

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