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Proceedings Paper

Production Testing Method For Wide-Angle Domes
Author(s): David Shafer
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Paper Abstract

Steep domes and nearly hemispherical shells are difficult to test from the center of curvature because of the very wide angle the test piece subtends from that position. To test the whole piece at once would require exceedingly fast f# test optics. A mosaic picture of the whole element can be built up by sequentially looking at subaperture areas, but this is clearly not ideal and is not suited for large-volume production situations. This paper describes a simple double-pass null test for wide-angle concentric domes and shells that greatly reduces the f# speed required of the test optics, and yet fills the whole aperture while giving a perfect null. The test involves an auxiliary Mangin mirror type of element nearly in contact with the dome or shell, and makes use of the aplanatic points of the inner surface of the test piece.

Paper Details

Date Published: 29 November 1979
PDF: 3 pages
Proc. SPIE 0193, Optical Systems in Engineering I, (29 November 1979); doi: 10.1117/12.957899
Show Author Affiliations
David Shafer, The Perkin-Elmer Corporation (United States)

Published in SPIE Proceedings Vol. 0193:
Optical Systems in Engineering I
Paul R. Yoder Jr., Editor(s)

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