Computer Science
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985silc.rept.....b&link_type=abstract
Final Report Sira Inst. Ltd., Chislehurst (England). Research and Development Div.
Computer Science
Mirrors, Spaceborne Telescopes, Weight Reduction, Ceramics, Composite Structures, Glass, Manufacturing, Technology Assessment
Scientific paper
Lightweight mirror techniques for space telescopes were identified, and development plans for technology demonstrations were prepared. The basic requirement is for mirrors up to 4 m diameter with area densities of 50 to 100 kg/sqm with aspherical form and a surface accuracy and quality appropriate for the efficient formation of diffraction-limited images with visible radiation. Segmented and membrane mirror systems are more suited to infrared systems. Active thin meniscus mirrors are potentially the most attractive of the techniques reviewed, passive and active. Attractions include the ability to correct gravity release and thermal loads, the wider choice of mirror materials including metals, the reduced dependence on any one mirror manufacturer, the possibility of reducing manufacturing costs, greater design confidence, and the possibility of achieving an area density of 50 kg/sqm. Lightweight fabrication techniques must be developed for the low expansion glasses and glass/ceramics. An alternative approach in which an active deformable mirror is utilized is recommended. This technique could offer great advantages over passive and semipassive techniques and may be applicable to a wider materials range.
Barker Adrian J.
Cutter Michael A.
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