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A diffractive optical element based machine vision system for local optical inspection of compressed paper

Oksman A., Silvennoinen R., Peiponen K. E., Avikainen M., Komulainen H.

Opto-Electronics Review

2005

Vol. 13, No. 1

39--42

Surface quality of fine and supercalendered (SC) paper samples was investigated by using a pressure gauge together with a machine vision system. It is shown in this study that a machine vision system that exploits diffractive optical element (DOE) along with a focused laser beam detects local specular reflectance variation of the compressed paper. It is suggested that this machine vision system can be utilized for inspection of optical quality variations of compressed paper.