Automatic interferometric evaluation of tool decentration for diamond-turned optics

Delvin A. Lindley

doi:10.1117/12.134856

1 January 1992 Automatic interferometric evaluation of tool decentration for diamond-turned optics

Delvin A. Lindley

Proceedings Volume 1531, Advanced Optical Manufacturing and Testing II; (1992) https://doi.org/10.1117/12.134856
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

Citation Download Citation

Delvin A. Lindley "Automatic interferometric evaluation of tool decentration for diamond-turned optics", Proc. SPIE 1531, Advanced Optical Manufacturing and Testing II, (1 January 1992); https://doi.org/10.1117/12.134856

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