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Optical Engineering

Fourier optic online measurement of the dimensional variations in paper
Author(s): Peter Hansson; Goran Manneberg
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Paper Abstract

All commercial paper types have a more or less apparent periodic pattern, called wire mark. We show how a Fourier optic analysis of this pattern can be used for on-line measurement of the dimensional variations of the paper in a paper or printing machine operating at a realistic speed (10 to 20 m/s). The way in which motion blur should be avoided during the exposure of the spatial light modulator, required to transform a spatially incoherent image of the paper into a coherent one, is also studied. Three techniques for doing this are discussed: rotating prism, rotating mirror and inverse filtering.

Paper Details

Date Published: 1 October 1999
PDF: 5 pages
Opt. Eng. 38(10) doi: 10.1117/1.602219
Published in: Optical Engineering Volume 38, Issue 10
Show Author Affiliations
Peter Hansson, Optronic Consult (Sweden)
Goran Manneberg, Royal Institute of Technology (Sweden)


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