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Proceedings Paper

Last results of MADRAS: a space active optics demonstrator
Author(s): Marie Laslandes; Claire Hourtoule; Emmanuel Hugot; Marc Ferrari; Christophe Devilliers; Arnaud Liotard; Céline Lopez; Frederic Chazallet
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Paper Abstract

The goal of the MADRAS project (Mirror Active, Deformable and Regulated for Applications in Space) is to highlight the interest of Active Optics for the next generation of space telescope and instrumentation. Wave-front errors in future space telescopes will mainly come from thermal dilatation and zero gravity, inducing large lightweight primary mirrors deformation. To compensate for these effects, a 24 actuators, 100 mm diameter deformable mirror has been designed to be inserted in a pupil relay. Within the project, such a system has been optimized, integrated and experimentally characterized. The system is designed considering wave-front errors expected in 3m-class primary mirrors, and taking into account space constraints such as compactness, low weight, low power consumption and mechanical strength. Finite Element Analysis allowed an optimization of the system in order to reach a precision of correction better than 10 nm rms. A dedicated test-bed has been designed to fully characterize the integrated mirror performance in representative conditions. The test set up is made of three main parts: a telescope aberrations generator, a correction loop with the MADRAS mirror and a Shack-Hartman wave-front sensor, and PSF imaging. In addition, Fizeau interferometry monitors the optical surface shape. We have developed and characterized an active optics system with a limited number of actuators and a design fitting space requirements. All the conducted tests tend to demonstrate the efficiency of such a system for a real-time, in situ wave-front. It would allow a significant improvement for future space telescopes optical performance while relaxing the specifications on the others components.

Paper Details

Date Published:
PDF: 8 pages
Proc. SPIE 10564, International Conference on Space Optics 2012, so1202; doi: 10.1117/12.2228773
Show Author Affiliations
Marie Laslandes, Lab. d’Astrophysique de Marseille (France)
Claire Hourtoule, Lab. d’Astrophysique de Marseille (France)
Emmanuel Hugot, Lab. d'Astrophysique de Marseille (France)
Marc Ferrari, Lab. d'Astrophysique de Marseille (France)
Christophe Devilliers, Thales Alenia Space (France)
Arnaud Liotard, Thales Alenia Space (France)
Céline Lopez, Thales SESO SAS (France)
Frederic Chazallet, euroShaktiware (France)


Published in SPIE Proceedings Vol. 10564:
International Conference on Space Optics 2012

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