Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983opmep..50....4a&link_type=abstract
(Optiko-Mekhanicheskaia Promyshlennost', vol. 50, Mar. 1983, p. 4-6) Soviet Journal of Optical Technology (ISSN 0038-5514), vol.
Astronomy and Astrophysics
Astronomy
Birefringence, Mirrors, Polishing, Reflecting Telescopes, Surface Finishing, Boundary Value Problems, Construction Materials, Fabrication, Image Resolution, Residual Stress, Temperature Gradients, Wave Front Deformation
Scientific paper
The design and manufacture of large astronomical mirrors are examined from both theoretical and practical perspectives. The effects of birefringence, tool-load relief, cord position, and temperature gradient on the surface quality are assessed quantitatively and discussed in terms of material choice and fabrication technique. It is shown that a single cord positioned horizontally produces only minimum image distortion. Formulas for calculating the deformation of the wave front by the mirror surface due to birefringence difference, the optimum load relief, and the deformation temperature, are presented. Graphs of important relationships and a table listing the diameters and surface parameters of recently built large telescopes are provided.
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