Self-calibration for microrefractive lens measurements

Neil W. Gardner; Angela D. Davies

doi:10.1117/1.2181982

1 March 2006 Self-calibration for microrefractive lens measurements

Neil W. Gardner, Angela D. Davies

Author Affiliations +

Optical Engineering, Vol. 45, Issue 3, 033603 (March 2006). https://doi.org/10.1117/1.2181982

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.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Neil W. Gardner and Angela D. Davies "Self-calibration for microrefractive lens measurements," Optical Engineering 45(3), 033603 (1 March 2006). https://doi.org/10.1117/1.2181982

Published: 1 March 2006

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