Physics – Optics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7426e..21k&link_type=abstract
Optical Manufacturing and Testing VIII. Edited by Burge, James H.; Fähnle, Oliver W.; Williamson, Ray. Proceedings of the SPIE
Physics
Optics
Scientific paper
A number of ongoing astrophysical mission concept studies are based on large aperture spaceborne telescopes. As optics get larger, both manufacturing and engineering trades come into consideration and must be balanced with the science goals and requirements. One of the top-level telescope trades examines the impact of a large monolithic primary mirror versus an array of smaller mirror segments to either fully or sparsely populate the same aperture. The first consideration is the scientific impact. Should the scattered edge effects and diffraction of a segmented design be acceptable, it then becomes a fabrication, test, and cost trade along with any associated risks. This paper will examine some of the key factors that go into such a trade and looks at manufacturing breakpoints. Examples such as the 4-m aperture New World Observer (NWO) and the 8-m aperture Advanced Technology Large Aperture Space Telescope (ATLAST) will be presented.
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