Patent ID: 9056368
Filing Date: 2015-06-16
Classification: B23K

Abstract:
1. A method for monitoring a laser processing operation to be performed on a workpiece, having the following steps: detecting at least two current measured values by means of at least one sensor that monitors the laser processing operation, providing a predetermined point set in a feature space, wherein the predetermined point set is defined inside the feature space by means of a learning process, by performing a reference run in which at least one process parameter is varied, wherein in the laser processing operation a upper and a lower specification boundary occurs and is overshot, determining at least two current features from the at least two current measured values, the at least the two current features jointly representing a current fingerprint in the feature space, wherein the determination of the at least two current features from the at least two current measured values comprises a method for data reduction or dimension reduction such as principal component analysis, and classifying the laser processing operation by detecting the position of the current fingerprint relative to the predetermined point set in the feature space, the at least one sensor comprising at least one camera unit that records camera images with different exposure times and processes said camera images with each other using a high dynamic range (HDR) method in order to provide images with high contrast ratio as current measured values.