Use Of Screen Rotation In Testing Large Mirrors

I. Ghozeil

doi:10.1117/12.953949

1 September 1974 Use Of Screen Rotation In Testing Large Mirrors

I. Ghozeil

Proceedings Volume 0044, Instrumentation in Astronomy II; (1974) https://doi.org/10.1117/12.953949
Event: Instrumentation in Astronomy, 1974, Tucson, United States

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.

Citation Download Citation

I. Ghozeil "Use Of Screen Rotation In Testing Large Mirrors", Proc. SPIE 0044, Instrumentation in Astronomy II, (1 September 1974); https://doi.org/10.1117/12.953949

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