A method for filtering and visualization of periodic structures on rough cylindrical surfaces

摘要

A method for the visualization of a periodic structure, in particular a spin structure, in a cylindrical surface of a workpiece,– in which process a laser light bundle approximately glance the cylindrical surface is irradiated and a diffraction image of the periodic structure in the secondary light reflected from the surface is generated,– and in which process the intensity distribution of the diffraction image is evaluated,characterized by the,that the laser light bundle (7) approximately in the circumferential direction on the cylindrical surface of the workpiece (3) is input andthat the expansion of the diffraction lines contained in the diffraction pattern as well as the signal - noise ratio of the diffraction image as a measure for the peak - to - valley - value of the swirl structure are used.