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Valtion Teknillinen Tutkimuskeskus

Timo H Piironen

Detlef Paul

Pertti Kontio

The invention relates to a method for automatic inspection of the surface,of a moving object, in which a region on the object's surface is illuminated from at least two different illumination directions,. The object's illuminated surface region is imaged with a camera to provide image information for analysis. The light sources in the different illumination directions,are pulsed to illuminate the object's surface region at different times, the pulsing frequency being >1 kHz The object's illuminated surface region is imaged as lines with a line scan camera,in sync with the above pulsing. The invention also relates to an arrangement for inspecting the surface,of a moving object, the arrangement comprising at least two light sources,in at least two different illumination directions,for illuminating the surface region of the object under inspection; a camera for imaging the object's surface region; and an image analyzer for analyzing the image information acquired from the object's surface,by imaging. The light sources,illuminate the object's surface,from the different illumination directions,at different times, and the camera is a line scan camera,. The arrangement further comprises a timing controller,for synchronous pulsing of the light sources,and the at least one line scan camera,, the pulsing frequency of the light sources,being >1 kHz.

Arrangement and method for inspection of surface quality

When examing visually uneven surfaces the problem is the disappearing of the areas remaining in the shade from the picture. To the lighting device in accordance wiht the invention for illumination of and elimination of shades from uneven surface (1) belong a source of light (2), a mainly globular reflecting contrivance (3), the interior surface of which is equipped with reflecting material, and to which openings (4, 5) for the examining of the surface and holes (6) for conducting of the light into the reflecting contrivance are formed, as well as a reflector element (7) for reflecting of light through the opening (4) into the reflecting contrivance.

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Oulu, Finland

Timo H Piironen