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24 March 1989 Process Control During Laser Machining
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Proceedings Volume 1020, High Power CO2 Laser Systems and Applications; (1989)
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany
Controlled laser processing is required to improve and ensure the quality of welding and heat treatment. A sensor collects informations from the processing zone and passes them to a controller. The controller generates a signal adjusting the beam power according to the present situation. This feed-back structure using a pyrometer as sensor for the surface temperature was successfully employed for transformation hardening of workpieces with complex geometries. The complex phenomena in laser induced plasma require a modified sensor. The plasma signal detected by a photodiode contains implicit informations about the quality of the welding process. These informations have to be worked up before they can be passed to a controller. An experimental approach of process modelling, which requires a wide banded (0..300kHz) on-line mesurement of beam power for a recursive system identification algorithm, will be described.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Drenker, W. Gatzweiler, K. Wissenbach, and E. Beyer "Process Control During Laser Machining", Proc. SPIE 1020, High Power CO2 Laser Systems and Applications, (24 March 1989);


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