Illuminating device for cylindrical objects, so that julich surfaces examination method and computer program product

摘要

The invention relates to a lighting device, comprising a cylindrical lamp (1) in its interior with a cylindrical slotted diaphragm (6), in which the luminaire a cylindrical light source (3) with a cylindrical diffuser (4) comprises a and in which the slotted aperture with axially extending slots (13) is a cylinder, the slots are arranged in such a way that at right angles to the slit diaphragms axis (o) incident light rays (7) is coupled through the slits in the interior of the slotted aperture, in a point spaced from the cylinder axis (m) converge.Furthermore, the invention relates to a method for the detection of defects on the surface of a cylindrical object (5), comprising the steps of:a) acting upon the object with radiation, the on a projection screen a pattern of mutually adjacent bright and dark stripes to be able to produce,b) orstaufgelöstes detecting the radiation reflected from the surface of the object and detecting the measured values as an image,c) calculating for each picture element of the image or a part of the image points of a plurality of features,d) identifying image points, where the value of a feature is above or below a predetermined threshold value,e) identifying image regions, in which the identified image points exceed a predetermined density,f) identifying a fault due to the fact that the to ..