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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.