1 July 1990 Progress toward making lightweight 8-m mirrors of short focal length
Author Affiliations +
Abstract
A technique has been developed for casting glass in the form of a honeycomb structure possessing good stiffness despite its low weight, and facilitating thermal control via forced ventilation of the honeycomb cells. To date, 3.5 m diameter mirrors of this type have been successfully cast; fully 8 m diameter mirrors are expected to be cast by 1992. No mirror of diameter as large as 8 m has ever been polished, however, and the difficulties which will be encountered shall be compounded by the shorter focal lengths required for advanced telescopic optics. A novel method, designated 'stressed lap polishing', has been developed to address these problems.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James Roger P. Angel, Warren B. Davison, John M. Hill, Edward J. Mannery, Hubert M. Martin, "Progress toward making lightweight 8-m mirrors of short focal length", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19273; https://doi.org/10.1117/12.19273
PROCEEDINGS
5 PAGES


SHARE
RELATED CONTENT

Technology for 8-m primary mirrors
Proceedings of SPIE (July 01 1990)
University Of Texas 7.6 Meter Telescope Project
Proceedings of SPIE (November 04 1982)
WIN 3.5-m telescope project
Proceedings of SPIE (July 01 1990)
A View In The Mirror Or Through The Looking...
Proceedings of SPIE (February 21 1986)
New optical telescope projects at Devasthal Observatory
Proceedings of SPIE (September 17 2012)
Very wide field, very fast telescope
Proceedings of SPIE (July 20 2000)
Giant Magellan Telescope (GMT)
Proceedings of SPIE (July 07 2004)

Back to Top