Silver protected is one of the most required coating for space observation telescopes covering the wavelength range from 430 nm to infra-red. Many challenges have to be addressed in such coatings including high efficiency over the wide spectrum, high durability with behavior in AIT conditions and during flight. Thales SESO has already produced more than 166 total space mirrors from which 87 are flying successfully since many years. Most of them are coated with protected silver coatings. For over the past 20 years, Thales SESO has enhanced the characteristics of our coating related to its durability in acceptance test conditions, its mechanical stability when going to vacuum and its behavior toward space aggressions such as ATOX or radiations. A lot of the corresponding developments were substantially sustained by CNES, together with Thales Alenia Space through different French programs. Previous realizations include Pléiades, French national program, MTG mirrors both for sounders (IRS instrument) and imagers (FCI instrument), Sentinel 3 with Na and Ob mirrors and different other export programs. The last improvements were made in the frame of TANGO program for Thales Alenia Space/CNES, with improved adhesion during acceptance tests, with ability to apply the full coating process on sub-assemblies including glued parts, and with reduction in the stress induced on the substrate. The performance and uniformity were demonstrated on 1700 mm diameter in Thales SESO STEP large coating chamber. Through these different developments Thales SESO has gained maturity in the contribution of the coating on stress induced in the mirror as well as its stability when going to vacuum. We now perfectly anticipate this effect in the polishing process. Here after, you find an overview of the Thales SESO realizations starting from Pléiades first results to the status achieved with the last improvements on TANGO program and future prospective developments.
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.
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).
Thales Alenia Space has been involved in the design and the development of space observation instruments for over 40 years. This paper will explain why active optics is needed for next generation of instruments for Earth observation. We will also describe what kind of solution is preferred and why. We will give 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, 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 achievable performances is given.
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