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Proceedings Paper

Development of an in-orbit refocusing mechanism for the Meteosat second-generation weather satellites
Author(s): Peter Verhoeff; H. A. van Mierlo; Ben C. Braam; Jeroen C. W. Hopman; W. P. van Werhoven; Marco Le Kluse
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Paper Abstract

A Refocusing Mechanism (REM) has been designed and built for the SEVIRI instrument, the imager in the Meteosat Second Generation (MSG) satellite. The purpose of the mechanisms is in-orbit focal adjustment from its geostationary assembly which forms part of SEVIRI. As the MSG satellite observes the earth and its atmosphere from its geostationary orbit, the REM will be used to compensate for satellite structural distortions due to gravitational-, thermal- and aging effects. It is designed for frequent use. It enables in- orbit refocusing in 1.4 micrometers steps over a range of 2 mm with virtually no spurious rotations and translations. The REM was designed to support a large 3.9 kg mirror module in an ARIANE 5 rocket launch environment without the use of clamping mechanisms. Further major design drivers were the limited volume and the strict mass requirement. The REM function is realized in two modules. A guide module, based on elastic elements provides the required stroke within the strict requirements on lateral deviation and tilt. An actuator module with a motor, a planetary gearbox and a recirculating rollerscrew provides the force for translation of the mirror assembly. Coupling of the two modules has been realized by a dedicated leverarm structure.

Paper Details

Date Published: 3 October 1998
PDF: 12 pages
Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325616
Show Author Affiliations
Peter Verhoeff, TNO Institute of Applied Physics (Netherlands)
H. A. van Mierlo, TNO Institute of Applied Physics (Netherlands)
Ben C. Braam, TNO Institute of Applied Physics (Netherlands)
Jeroen C. W. Hopman, TNO Institute of Applied Physics (Netherlands)
W. P. van Werhoven, TNO Institute of Applied Physics (Netherlands)
Marco Le Kluse, TNO Institute of Applied Physics (Netherlands)

Published in SPIE Proceedings Vol. 3439:
Earth Observing Systems III
William L. Barnes, Editor(s)

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