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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.

Gloss inspection of metallic products by diffractive optical element based sensor

Myller K., Silvennoinen R., Peiponen K.

Opto-Electronics Review

2003

Vol. 11, No. 1

35-38

A sensoe was developed to measure the glos of curved metal objects. The crucial part of the sensor is a diffractive optical element (DOE). The advantages of the present sensor are non-contact measurement mode, normal incidence of the probe light, and possibility to measure gloss of curved surfaces. The sensory yields information also on the surface texture, such as finishing marks, of curved metal surfaces. The operation of the sensor was verified by measuring draw-off pipes of water cranes, which were obtained from metal industry.