Manufacturing Industry
Carbon-fiber reinforced mirror weighs 77 pounds.
Advanced Materials & Processes, November, 2000
This space telescope mirror is made of carbon fiber reinforced polymer (CFRP), and weighs just 35kg (77 lb). it is about 2 m (7 ft) across, and was developed by Composite Optics inc., San Diego, Calif., in partnership with the NASA Jet Propulsion Laboratory. It is said to be "the world's largest, lightest-weight, most dimensionally stable, all-composite mirror." The technology will be the enabling lightweight construction technology that will be used for future space telescopes.
Requirements for the mirror included a surface accuracy of a few microns RMS at the cryogenic operating temperature of 80K, with first mode stiffness greater than 60Hz, and areal density less than 20 kg/[m.sup.2]
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