Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976nropt...7..381b&link_type=abstract
Nouvelle Revue d'Optique, vol. 7, Nov.-Dec. 1976, p. 381-387. In French.
Astronomy and Astrophysics
Astronomy
2
Cost Effectiveness, Infrared Astronomy, Optical Properties, Paraboloid Mirrors, Telescopes, Weight Reduction, Accelerated Life Tests, Bending, Interferometry, Mosaics, Photometry, Sandwich Structures
Scientific paper
The design and fabrication procedure of a large, light-weight mirror for use in infrared astronomical collectors are considered. The mirror consists of 61 thin tubes of identical diameter and length, and of two thin hexagonal plates with a diagonal of 98 cm. These two components comprise a sandwich structure with the plates on the outside and the tubes inside. Attention is given to fabrication of the elements, assembly, adhesion of the plates to the tubes, and welding. Results of bending and accelerated life tests on the mirror specimens are presented and the optical quality of the mirrors is examined by means of photometry, the use of Foucaultgrams and through images at the center of curvature. The prototype mirror with a diagonal of 98 cm weighs 50 kg after finishing, which would allow one to realize a primary mirror mosaic weighing about 80 kg/sq m.
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