| 主权项 |
1. A method for monitoring a processing region of a workpiece on which a laser processing operation is being carried out, the method comprising:
detecting the radiation emitted by the processing region in a space-resolved manner, wherein the processing region is divided into a grid comprising a plurality of unit areas, each unit area of the grid representing a corresponding elemental area of the processing region, and wherein detecting the radiation emitted by the processing region comprises detecting the radiation for each elemental area at least two wavelengths simultaneously; optically filtering, for each elemental area, the at least two wavelengths; producing, for each wavelength of the at least two wavelengths, a corresponding image of the processing region, wherein the image is based on the radiation detected at the wavelength; determining, for each elemental area, an emission coefficient from the images; and performing a quality assessment of the laser processing operation based on the determined emission coefficients, wherein the processing region comprises one or more selected from the group consisting of a key hole, the molten film surface of a keyhole, a weld pool produced in laser welding, a wake of a weld pool, solidified material, and a heat-affected zone. |
