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Proceedings Paper

Automatic interferometric evaluation of tool decentration for diamond-turned optics
Author(s): Delvin A. Lindley
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Paper Abstract

The proper centering of the cutting tool's motion with respect to the spindle axis is essential for the generation of programmed surface figures on turned optical components. The tool centering error, or decentration error, is decomposed into horizontal and vertical displacements. Horizontal decentration imparts a conical figure error to programmed spherical surfaces. Visual interferometric analysis of this figure has been used to estimate the magnitude and sign of this offset. Vertical decentration cannot be estimated by fringe pattern analysis since it does not generate a significant figure error. Here the application of phase measuring interferometry is suggested to obtain automatic estimates of these errors. The horizontal error is obtained by fitting a simple radial polynomial to the phase data. The vertical offset is derived from the extent of a poorly modulated central zone.

Paper Details

Date Published: 1 January 1992
PDF: 9 pages
Proc. SPIE 1531, Advanced Optical Manufacturing and Testing II, (1 January 1992); doi: 10.1117/12.134856
Show Author Affiliations
Delvin A. Lindley, Phase Shift Technology, Inc. (United States)

Published in SPIE Proceedings Vol. 1531:
Advanced Optical Manufacturing and Testing II
Victor J. Doherty, Editor(s)

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