Mr. Damien Sucher Profile

Damien Sucher

at Thales Alenia Space

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Proceedings Article | 11 June 2021 Open Access

Full scale active telescope engineering model

Sébastien Guionie, Guillaume Briche, Damien Sucher, Mélanie Verdino, Enguerran De La Vaquerie, Florent Favier, Mikaël Carlavan, F. Champandard, Christophe Devilliers, Vincent Costes, Arnaud Liotard, Lauriane Galtier, Jean-François Blanc

Proceedings Volume 11852, 118522Y (2021) https://doi.org/10.1117/12.2599459

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Thales Alenia Space has designed and developed space high performance observation instruments for more than 40 years. The future missions will have to deal with better performance, better optical quality while from affordability point of view, the total mass, the development schedule and the final cost have to be reduced. These constraints induce an innovative generation of solutions based on larger entrance optics associated to high lightweight ratio. In these conditions, the enhancement of the final performance can only be guaranteed by using active optics in flight. In this context, Thales Alenia Space has been selected by French National Space Agency (CNES) to develop an active optics full scale telescope to path the way for the new class of Extremely high resolution telescopes. The whole building blocks have been already tested and qualified over the last 4 years. So, a deformable mirror is implemented in the future large telescopes in order to correct manufacturing residues, ground/flight evolution including gravity. Moreover, low mass and high agility satellites require more compact designs which implies telescope solutions more sensitive to misalignments. An active positioning mechanism is then also needed in order to correct the telescope alignment during flight conditions. A wavefront sensor is implemented in the mission focal plane and the global active loop validated. This paper presents the validation of active optic telescope on a full scale Engineering Model of 1500mm of entrance pupil diameter. All the active optic building blocks already qualified are mounted on this demonstrator. This Engineering model has followed a complete integration and alignment process that confirms the breakthrough simplification expected. The test plan validates on a full scale model the wave-front correction algorithms on-ground and in flight conditions, ensuring the best performance achievable with the telescope all along the lifetime.

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Proceedings Article | 9 September 2019 Paper

Active optics for space telescopes

Damien Sucher, Guillaume Butel, Guillaume Briche, Jean-François Blanc, Arnaud Liotard, Marc Bernot, Mikaël Carlavan, Aurélien Suau, Nisrine Louh, Lauriane Galtier, Sebastien Guionie, Thierry Viard, Fabrice Champandard, Jean-Bernard Ghibaudo, Vincent Costes, Stéphanie Behar-Lafenetre

Proceedings Volume 11116, 1111611 (2019) https://doi.org/10.1117/12.2529103

KEYWORDS: Telescopes, Mirrors, Active optics, Deformable mirrors, Space telescopes, Aerospace engineering, Actuators, Optical instrument design, Optical alignment, Algorithm development

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Thales Alenia Space is designing and developing space observation instruments since more than 40 years. This paper explains why active optics is needed for next generation of instruments for Earth observation. It describes what kind of solution is preferred and gives an overview of the development status on the associated technologies. Indeed, the future missions will have to deal with better performance, better optical quality while from manufacturing point of view, the total mass, the development schedule and the final cost have to be reduced. These constraints induce a new generation of solutions based on large entrance optics associated to high lightweight ratio which naturally provide solutions sensitive to gravity deformation. In these conditions, the enhancement of the final performance can only be guaranteed by using active optics in flight. A deformable mirror is therefore foreseen to be implemented in future large telescopes in order to correct manufacturing residues and ground/flight evolution, including gravity. Moreover, low mass and low cost require more compact designs which entail solutions more sensitive to misalignment. An active positioning mechanism is then also needed in order to correct the telescope alignment during operation conditions. Thales Alenia Space has been selected by CNES to develop and qualify active optics building blocks and then to test and demonstrate the improvement that new active technologies can bring in a full size instrument representative of the next generation of observation instruments. An overview of the current development status and the achieved performances is given for each building block (Primary Mirror, deformable mirror, 6-dof mechanism, wavefront sensor).

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