1 October 1999 Fourier optic online measurement of the dimensional variations in paper
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Optical Engineering, 38(10), (1999). doi:10.1117/1.602219
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.
Peter Hansson, Goran Manneberg, "Fourier optic online measurement of the dimensional variations in paper," Optical Engineering 38(10), (1 October 1999). http://dx.doi.org/10.1117/1.602219


Spatial light modulators

Fourier optics

Modulation transfer functions

Optical filters

Optical testing

Image filtering


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