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Proceedings Paper

Optical Flatness Standard II: Reduction Of Interferograms
Author(s): William Primak
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Paper Abstract

In [I], "Optical flatness standard," by W. Primak, published in Optical Enneerie 23(6), 806-61,5 (1984) , the ultimate precision of determining figures of optical flats was considered for an investigation of dimensional stability and stress relaxation, where any increase in precision of measurement is significant in shortening these investigations, usually extending over months and years. Although it might have been adequate to examine the contour along a single traverse, an attempt was made to combine such measurements to determine the figure of the whole surface in order to choose a traverse away from abrupt contour variations to avoid the errors of placement. With the equipment then at hand, it was difficult to handle more than a few traverses at a time. Now, with the advent of microcomputers with large memories and faster computational speeds, it has become practical to configure data loggers capable of handling data for the whole surface at once, thus greatly simplifying the task of combining the data for the interference patterns of sets of flats in pairs to determine their individual figures, and also giving access to a variety of methods. Several methods of reducing the interference patterns, including two using Fourier series expansions and one using substitution are given, and the problems of such determinations are discussed. A mathematical error in [I] is corrected.

Paper Details

Date Published: 16 January 1989
PDF: 7 pages
Proc. SPIE 0954, Optical Testing and Metrology II, (16 January 1989); doi: 10.1117/12.947612
Show Author Affiliations
William Primak, Wolfe Loeb & Co. (United States)


Published in SPIE Proceedings Vol. 0954:
Optical Testing and Metrology II
Chander Prakash Grover, Editor(s)

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