![]() The MFDs and RHP Brackets are both mounted on Interface Structures (IFSs) or on a single rigid Socle, depending on the mirror assembly.The Radiative Heating Plate is supported by brackets (RHPBs) which also act as thermal insulation.A Radiative Heating Plate (RHP) with a double layer heater on each side is used for thermal control of the mirror.The MFDs also thermally insulate the mirror from the interface.The mirrors are integrated on flexures called Mirror Fixation Devices (MFDs) to filter the vibration and optimize stability. ![]() Coatings of the mirrors are gold or silver, depending on the mirror.The mirrors are lightweighted ZerodurĀ®.These Mirror Assemblies have been developed jointly by THALES SESO and LIDAX during phase B/C of the contract awarded by OHB System AG (formerly Kayser-Threde), who is responsible for the telescope assembly of both FCI-TA and IRS instruments. This paper describes the key design features and expected performances before STM (Structural Thermal Model) Test Campaign for M1, M2, M3 and M4 Mirrors of MTG FCI-TA (Flexible Combined Imager) and IRS (Infra-Red Sounder) Front Telescope Optics (FTO). Meanwhile, an optimum assembly process assures the demanding required cleanliness levels. Joint efforts of these two companies have minimized alignment and stability errors while providing the required optical performance together with stiffness & strength enough to withstand the environmental loads. LIDAX will describe the Thermal Control design, high stability Mirror Supports and Field Stops/Aperture Stops. THALES SESO will review Optical Elements key issues with associated performance characteristics, related to mirrors and flexures. In the case, MTG has resulted in the need to unprecedented requirements in terms of Optical Elements quality and Thermal Control. Leading Edge Earth Observation Missions are demanding Higher Resolution Systems, which in turn result in even more stringent requirements in terms of stability for the Optical Elements. Four MTG-I and two MTG-S satellites will bring to the meteorological community a series of satellites for continuous high spatial, spectral and temporal resolution observations and geophysical parameters of the Earth based on sensors from the geo-stationary orbit. There will be up to 6 satellites series to cover beyond 20 years of European meteorology. It will ensure the future continuity of MSG with the capabilities to enhance nowcasting, global and regional numerical weather prediction, climate and atmospheric chemistry monitoring data from Geostationary Orbit. The Meteosat Third Generation (MTG) Programme is being realised through the well established and successful Cooperation between EUMETSAT and ESA.
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