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Proceedings Paper

Holographic radius test plates
Author(s): Quandou Wang; Johannes A. Soons; Ulf Griesmann
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Paper Abstract

We evaluate a method for testing the radius of a spherical surface with a hologram that consists of a pair of nested Fresnel zone lenses. The hologram is positioned in the collimated test beam of a Fizeau interferometer. The inner zone lens generates a focus at the test part surface, whereas the wavefront of the first diffraction order of the outer zone lens is confocal with the test part. When the test part radius is equal to the nominal radius, the fringes in both zone lens areas are nulled at the same distance of the test sphere from the zone lens. The radius error of the spherical surface can be calculated from the test sphere displacement between interferometer null positions for the inner and outer zone lenses, or from the defocus term of the outer (confocal) lens at the position of zero defocus of the inner (cat’s-eye) zone lens. The primary benefits of the nested zone lens method are its ease of use, and that it enables radius measurements of spherical surfaces with large radii. We describe the radius measurement of a precise convex sphere with a nominal radius of 80mm.

Paper Details

Date Published: 7 September 2013
PDF: 7 pages
Proc. SPIE 8838, Optical Manufacturing and Testing X, 88380I (7 September 2013); doi: 10.1117/12.2024890
Show Author Affiliations
Quandou Wang, National Institute of Standards and Technology (United States)
Johannes A. Soons, National Institute of Standards and Technology (United States)
Ulf Griesmann, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 8838:
Optical Manufacturing and Testing X
Oliver W. Fähnle; Ray Williamson; Dae Wook Kim, Editor(s)

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