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Proceedings Paper

Automated design technique for steel trusses supporting close-packed hexagonal mirror segment arrays
Author(s): Frank B. Ray
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Paper Abstract

One method of reducing the cost of a large terrestrial telescope is to fix its spherical primary mirror with respect to gravity and utilize a tracking mechanism revolved about the mirror's center of curvature to compensate for an astronomical image's ephemeral position and rate. To maximize throughput, hexagonal segments may be arrayed in a close-packed fashion on the primary sphere, but because regular hexagons do not tile a spherical surface, either the hexagons must be irregular, as in the Keck 10 m telescope, or they must be irregularly spaced. In either case, we can exploit the natural symmetry of the underlying geometry in order to define a truss generation scheme which is generally useful in both design and cost reduction.

Paper Details

Date Published: 1 June 1994
PDF: 10 pages
Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); doi: 10.1117/12.176266
Show Author Affiliations
Frank B. Ray, Univ. of Texas McDonald Observatory (United States)

Published in SPIE Proceedings Vol. 2199:
Advanced Technology Optical Telescopes V
Larry M. Stepp, Editor(s)

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