Method for checking profile dimensions of elongate products

摘要

The method for optical checking of the profile cross section of an elongate product consists of transversely illuminating the profile with a laser beam with a predetermined angle of incidence, forming at least one image of the cut, and reconstructing the profile via image analysis. The method is characterised by the fact that the laser beam is dynamically focussed along the profile.Special points of the profile are illuminated with sufficient excess intensity to locally saturate a picture spot of a camera (20) delivering the image. The centre of the spot is given by its centroid. The illumination of the rest of the profile is an order less than the resolution of the camera.