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Optical Engineering

Object positioning by a digital moire focusing technique
Author(s): Roberto Daniel Torroba; L. C. S. Nunes; Alberto A. Tagliaferri
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Paper Abstract

Based on measuring the contrast of moire fringes produced by digital subtraction, an alternative method for object positioning is presented. We use a model of fringe visibility mismatch due to defocusing and search for a global maximum as the best focusing criterion. Both laser and white light illumination are tested. Experimental results shows an accuracy of 0.5 mm.

Paper Details

Date Published: 1 August 1999
PDF: 4 pages
Opt. Eng. 38(8) doi: 10.1117/1.602191
Published in: Optical Engineering Volume 38, Issue 8
Show Author Affiliations
Roberto Daniel Torroba, Ctr. de Investigationes Opticas (Argentina)
L. C. S. Nunes, Univ. Federal Fluminense (Brazil)
Alberto A. Tagliaferri, Univ. Federal Fluminense (Brazil)

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