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12 July 2023 Full-SiC derotator optics for METimage: flight hardware status
Christian Bastin, Etienne Renotte, Michel Bougoin, P. Bronlet, B. Carlomagno, Alexis Feutry, Nicolas Fontana, Pierre Gloesener, A. Jago, Fabien Lemagne, Daniel Logut, Florent Mallet, Y. Martin, M. Pfaffe, A. Radioti, S. Thomas
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Proceedings Volume 12777, International Conference on Space Optics — ICSO 2022; 127772Q (2023) https://doi.org/10.1117/12.2690295
Event: International Conference on Space Optics — ICSO 2022, 2022, Dubrovnik, Croatia
Abstract
METimage is an advanced multispectral radiometer for weather and climate forecasting developed by Airbus Defence & Space under the auspices of the German Space Administration (DLR) for the EUMETSAT Polar System-Second Generation (EPS-SG). The instrument is equipped with a continuously rotating scan mirror with a 1.7s period followed by a static telescope. The scan mirror permits an extended Earth view of 108° per revolution and regular views to on-board calibration sources. A derotator assembly, which is half-speed synchronised with the scanner, is inserted in the optical beam after the telescope to compensate the image rotation in the focal plane. The derotator optical arrangement is a five-mirror concept that minimises the polarisation sensitivity. The derotator design is constrained by optical performance, mass and compactness, which led to the selection of a full silicon carbide (SiC) concept. The stringent alignment requirements of the derotator optics lead to an excellent pointing accuracy, confirmed by the measurements performed with a dedicated OGSE. The measured wavefront error of the system is very small, thanks to fine polishing of the five optics. In this paper, we will present the overall design of the derotator, discuss the manufacturing of the key SiC elements and present the results of the FM1 test campaign.
© (2023) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Christian Bastin, Etienne Renotte, Michel Bougoin, P. Bronlet, B. Carlomagno, Alexis Feutry, Nicolas Fontana, Pierre Gloesener, A. Jago, Fabien Lemagne, Daniel Logut, Florent Mallet, Y. Martin, M. Pfaffe, A. Radioti, and S. Thomas "Full-SiC derotator optics for METimage: flight hardware status", Proc. SPIE 12777, International Conference on Space Optics — ICSO 2022, 127772Q (12 July 2023); https://doi.org/10.1117/12.2690295
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KEYWORDS
Mirrors
Optical alignment
Optics manufacturing
Astronomical imaging
Silicon carbide
Design and modelling
Coating
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