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1 September 1991 Manufacture of ISO mirrors
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric Ruch "Manufacture of ISO mirrors", Proc. SPIE 1494, Space Astronomical Telescopes and Instruments, (1 September 1991);


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