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Proceedings Paper

Use Of Screen Rotation In Testing Large Mirrors
Author(s): I. Ghozeil
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Paper Abstract

An automated microdensitometer is used to obtain a density distribution on a photographic plate. Each density is proportional to a surface departure from ideal at some point on a mirror during its figuring. The departures are obtained by the screen test method developed at Kitt Peak National Observatory, as applied to the 4-meter primary mirror. It is shown that for various screen rotations with the mirror stationary, easily interpreted results are obtained with this density representation. These results are in good agreement with each other. When all the rotated-screen density representations are made on the same photographic plate, one obtains a composite in which areas of greatest agreement are emphasized and areas of scarce surface sampling are complemented.

Paper Details

Date Published: 1 September 1974
PDF: 6 pages
Proc. SPIE 0044, Instrumentation in Astronomy II, (1 September 1974); doi: 10.1117/12.953949
Show Author Affiliations
I. Ghozeil, Kitt Peak National Observatory' (United States)


Published in SPIE Proceedings Vol. 0044:
Instrumentation in Astronomy II
Lewis Larmore; Donald H. Menzel; David Crawford, Editor(s)

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