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Optical Engineering

Self-calibration for microrefractive lens measurements
Author(s): Neil W. Gardner; Angela D. Davies
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Paper Abstract

The self-calibration test known as the random ball test (RBT) is adapted and applied to instrument calibration for measurements of microrefractive lens figure error. The RBT exploits the symmetry properties of a microsphere, resulting in a low-uncertainty estimate of the instrument biases. One hundred surface patches on a 1-mm-diam steel sphere are imaged by commercial instruments then averaged together in software to determine the instrument bias for a 500-µm radius of curvature test piece. The results show biases on the order of a few hundred nanometers peak-to-valley for a scanning white light interferometer and a Twyman-Green interferometer.

Paper Details

Date Published: 1 March 2006
PDF: 5 pages
Opt. Eng. 45(3) 033603 doi: 10.1117/1.2181982
Published in: Optical Engineering Volume 45, Issue 3
Show Author Affiliations
Neil W. Gardner, The Univ. of North Carolina at Charlotte (United States)
Angela D. Davies, The Univ. of North Carolina at Charlotte (United States)

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