Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Spectra-physics Visiontech Oy

Other

Pertti Kontio

Detlef Paul

Timo H Piironen

Martti Karppinen

Ari Harkonen

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

In a method an an apparatus for automatic inspection of moving surfaces using at least three different illumination/observation channels, the surface to be inspected under a bright field condition is illuminated by a first beam of light from a first light source. The light of the first beam of light reemitted from the surface is received by a light sensitive sensor device to obtain a first signal. Then, the surface is illuminated under a dark field condition by a second beam of light and by a third beam of light from a second and a third light source, respectively, the first, second and third beams of light having different characteristics. The light of the second beam of light and the light of the third beam of light, respectively, reemitted from the surface are received by the light sensitive sensor device to obtain a second signal and a third signal. Finally, a physical property of the surface is derived from the first, second and third signals.

Method and apparatus for automatic inspection of moving surfaces

Growing community of inventors

Oulu, Finland

Pertti Kontio