Computer Science – Performance
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1494..265r&link_type=abstract
IN: Space astronomical telescopes and instruments; Proceedings of the Meeting, Orlando, FL, Apr. 1-4, 1991 (A92-45151 19-89). Be
Computer Science
Performance
Cryogenic Temperature, Infrared Space Observatory (Iso), Infrared Telescopes, Mirrors, Diffraction Patterns, European Space Agency, Functional Design Specifications, International Cooperation, Structural Weight
Scientific paper
The three mirrors comprising the Infrared Space Observatory telescope are discussed. The mirrors are made of fused silica substrate using a Ritchey-Chretien configuration. The primary mirror is aspherical, has an aperture diameter of 640 mm, and a fast F number of F/1.6. The mirror is mechanically lightweighted to a ratio of 70 per cent and is figured to lambda/90 RMS at the specified wavelength of 5 microns. The aspherical secondary mirror has a diameter of 90 mm. The pyramidal mirror's four sides reflect the incoming light in four perpendicular directions toward the scientific instruments. Consideration is given to the manufacturing steps of these mirrors, including the lightweighting process, the thermal and mechanical interface machining, the acid etching, the aspherical grinding and polishing, the coating, and the assembly on their support structure. Wavefront error measurements show diffraction-limited performance for each mirror as well as for the whole telescope.
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