METHOD FOR DETERMINING THE POSITION OF AT LEAST ONE EDGE OF AN OBJECT BY EVALUATING FRESNEL DIFFRACTION BORDER PROFILES

摘要

The present invention is a method for determining at least one position of the edge of the object, in particular the strand, the method comprising illuminating the object with light from at least one coherent light source, the diffraction border are caused by the object, , steps that are generated in both the geometric boundaries of the shade, at least one of the spatial intensity profile of the diffraction border at least one single or multi-line (multi line) step of recording, using the optical sensor, at least one of the recorded intensity profile the step shown in the derivative with respect to position, and the square this position axis, and comparing the at least one of the recorded intensity profile at least one reference periodic intensity profile shown in the finely divided, and square with respect to the position where the axis of the object based on the comparison is completed at least the position of one edge It relates to a method, comprising the determining step.;