Object positioning by a digital moire focusing technique

Roberto Daniel Torroba; L. C. S. Nunes; Alberto A. Tagliaferri

doi:10.1117/1.602191

1 August 1999 Object positioning by a digital moire focusing technique

Roberto Daniel Torroba, L. C. S. Nunes, Alberto A. Tagliaferri

Optical Engineering, Vol. 38, Issue 8, (August 1999). https://doi.org/10.1117/1.602191

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.

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Roberto Daniel Torroba, L. C. S. Nunes, and Alberto A. Tagliaferri "Object positioning by a digital moire focusing technique," Optical Engineering 38(8), (1 August 1999). https://doi.org/10.1117/1.602191

Published: 1 August 1999

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