The Infrared Space Observatory (ISO), a project of the European space agency (ESA), is an astronomical satellite operating at wavelengths from 2.5 to 200 microm. It will be launched in 1993. The ISO optical subsystem is a cryogenically cooled telescope with its baffling system (main baffle and sunshade). The telescope, a 60 cm Ritchey-Chretien type, focuses the beam to the four scientific instruments located in its focal plane. The extremely low temperature, 1.8 K, is provided by the PayLoad Module (PLM) cryostat, filled with superfluid He. The design of those three elements, which will be described after, has been supported on one hand by different mathematical models (mechanical, thermal and optical for image quality and straylight) and on the other hand by dedicated elementary tests linked to operation in cryogenic environment (infrared coatings, mirror fixation, bonding at cryogenic temperature, welding ...).
The infrared space observatory. Optical subsystem
Das Infrarot-Weltraumobservatorium. Optisches Teilsystem
1991
10 Seiten, 5 Bilder, 2 Tabellen, 6 Quellen
Conference paper
English
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The Infrared Space Observatory
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