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Proceedings Paper • Open Access

The FCI on board MTG : optical design and performances
Author(s): J. Ouaknine; T. Viard; B. Napierala; U. Foerster; S. Fray; P. Hallibert; Y. Durand; S. Imperiali; P. Pelouas; J. Rodolfo; F. Riguet; J.-L. Carel

Paper Abstract

Meteosat Third Generation is the next ESA Program of Earth Observation dedicated to provide Europe with an operational satellite system able to support accurate prediction of meteorological phenomena until the late 2030s. The satellites will be operating from the Geostationary orbit using a 3 axes stabilized platform. The main instrument is called the Flexible Combined Imager (FCI), currently under development by Thales Alenia Space France. It will continue the successful operation of the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on Meteosat Second Generation (MSG) with improved performance.

This instrument will provide full images of the Earth every 10 minutes in 16 spectral channels between 0.44 and 13.3 μm. The ground resolution is ranging from 0.5 km to 2 km. The FCI is composed of a telescope developed by Kayser-Threde, which includes a Scan mirror for the full Earth coverage, and a calibration mechanism with an embedded black body dedicated to accurate in-flight IR radiometric calibration. The image produced by the telescope is split into several spectral groups by a spectral separation assembly (SSA) thanks to dichroïc beamsplitters. The output beams are collimated to ease the instrument integration before reaching the cryostat. Inside, the cold optics (CO-I) focalize the optical beams onto the IR detectors. The cold optics and IR detectors are accurately positioned inside a common cold plate to improve registration between spectral channels. Spectral filters are integrated on top of the detectors in order to achieve the required spectral selection.

This article describes the FCI optical design and performances. We will focus on the image quality needs, the high line-of-sight stability required, the spectral transmittance performance, and the stray-light rejection. The FCI currently under development will exhibit a significant improvement of performances with respect to MSG.

Paper Details

Date Published: 17 November 2017
PDF: 9 pages
Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 1056323 (17 November 2017); doi: 10.1117/12.2304144
Show Author Affiliations
J. Ouaknine, Thales Alenia Space (France)
T. Viard, Thales Alenia Space (France)
B. Napierala, Thales Alenia Space (France)
U. Foerster, Kayser Threde (Germany)
S. Fray, Kayser Threde (Germany)
P. Hallibert, ESA (Netherlands)
Y. Durand, ESA (Netherlands)
S. Imperiali, Thales SESO S.A.S. (France)
P. Pelouas, Thales SESO S.A.S. (France)
J. Rodolfo, REOSC (France)
F. Riguet, REOSC (France)
J.-L. Carel, REOSC (France)

Published in SPIE Proceedings Vol. 10563:
International Conference on Space Optics — ICSO 2014
Zoran Sodnik; Bruno Cugny; Nikos Karafolas, Editor(s)

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