Parks, R.
, Shao, L.
and Evans, C.
(1998),
Pixel Based Absolute Topography Test for Three Flats, Applied Optics
(Accessed July 13, 2025)
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Pixel Based Absolute Topography Test for Three Flats
Published
Author(s)
, Lianzhen Shao,
Abstract
We demonstrate a new method of performing the absolute three flat test using reflection symmetries of the surfaces and an algorithm for generating the rotation of arrays of pixel data. Most of the operations involve left/right and top/bottom flips of data arrays, operations that are very fast on most frame grabbers and are available on most commercial phase measuring interferometers. We demonstrate the method with simulated data as well as with actual data from 150 mm diameter surfaces that are flat to better than 25 nm peak-to-valley.Citation
Applied Optics
Volume
37(25)
Pub Type
Journals
Keywords
absolute testing, interferometry, optical testing, surface metrology, three-flat test
Citation
Issues
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Created December 31, 1997, Updated October 12, 2021