Patent ID: 6757055
Filing Date: 2004-06-29
Classification: B23K

Abstract:
A method of measuring process parameters of a material working process using a high energy beam (2), in particular a laser beam, focused onto a working zone of a workpiece (8) by measuring with an optical sensor (10) the light intensity emitted from the workpiece substantially coaxially to high energy radiation directed toward the working zone in an area of vapour capillaries (14) produced by the high energy beam (2), the optical sensor (10) sensing a picture field and transmitting the measuring signals to an evaluation means (18),wherein the optical sensor (10) has a dynamic range of more than 70 db, and measuring signals of sections of (a) an image field showing the area of the vapour capillaries (14) and (b) at least an area of a melting zone (20) surrounding the vapour capillaries (14) which are simultaneously transmitted to the evaluation means (18).