Manufacture of large glass honeycomb mirrors

Details Manufacture of large glass honeycomb mirrors Manufacture of large glass honeycomb mirrors

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..332..298a&link_type=abstract

IN: International Conference on Advanced Technology Optical Telescopes, Tucson, AZ, March 11-13, 1982, Proceedings (A83-30976 13

Astronomy and Astrophysics

Astronomy

1

Borosilicate Glass, Honeycomb Structures, Mirrors, Telescopes, Casting, Fabrication, Ground Stations, Refractory Materials, Spaceborne Telescopes, Structural Weight, Temperature Gradients, Ventilation

Scientific paper

The problem of making very large glass mirrors for astronomical telescopes is examined, and the advantages of honeycomb mirrors made of borosilicate glass are discussed. Thermal gradients in the glass that degrade the figure of thick borosilicate mirrors during use can be largely eliminated in a honeycomb structure by internal ventilation (in air) or careful control of the radiation environment (in space). It is expected that ground-based telescopes with honeycomb mirrors will give better images than those with solid mirrors. Materials, techniques, and the experience that has been gained making trial mirrors and test castings as part of a program to develop 8-10-m-diameter lightweight mirrors are discussed.

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