Planning the National New Technology Telescope (NNTT). III - Primary optics - tests on a 1.8-m borosilicate glass honeycomb mirror

Details Planning the National New Technology Telescope (NNTT). III - Primary optics - tests on a 1.8-m borosilicate glass honeycomb mirror Planning the National New Technology Telescope (NNTT). III - Primary optics - tests on a 1.8-m borosilicate glass honeycomb mirror

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..628...91p&link_type=abstract

IN: Advanced technology optical telescopes III; Proceedings of the Meeting, Tucson, AZ, Mar. 3-6, 1986 (A87-35201 15-89). Bellin

Computer Science

Performance

1

Borosilicate Glass, Honeycomb Structures, Mirrors, Planning, Reflecting Telescopes, Casting, Finite Element Method, Interferometry, Performance Tests, Temperature Gradients

Scientific paper

Materials for large primary mirrors should have low density, high elastic modulus, low coefficient of thermal expansion, dimensional stability over time, favorable polishing characteristics and affordable cost. The mirror's structural shape can contribute to high stiffness, low weight and a short thermal time constant. These characteristics can be provided by cast honeycomb borosilicate glass mirrors, but the coefficient of 1/4-arcsecond level. This paper describes a series of tests performed on a 1.8-meter cast honeycomb mirror with an integral ventilation system for temperature control. Surface distortions have been related to the pattern of temperatures present, and the effect of ventilation on the thermal time constant has been explored. The results are extrapolated to larger size mirrors using finite-element analysis.

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