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Proceedings Paper

Closed-loop control of material processing with high-power CO2 lasers
Author(s): Hans Kurt Toenshoff; Ludger Overmeyer; Ferdinand von Alvensleben
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Paper Abstract

To obtain on-line information about the different processes in laser machining like cutting, welding and material removal, optical sensors are integrated in the working head of a high power CO2 laser machining system. In order to detect the dynamic light or plasma intensity fluctuation during machining, these sensors provide the real-time signal of the vapor or plasma flame intensity in the wavelength spectrum of 200 nm to 1100 nm. Moreover, the real-time intensity of the laser power is measured in real-time with a pyroelectrical sensor. The aim is to analyze each process. With the knowledge of the specific characteristics of the process, a closed-loop control is set up. Distinguishing between continuous and pulsed processes, different control algorithms have been developed and tested. Thus, a control system based on micro-controller hardware and its theoretical background for failure detection and closed loop control is explained.

Paper Details

Date Published: 17 April 1995
PDF: 9 pages
Proc. SPIE 2375, Beam Control, Diagnostics, Standards, and Propagation, (17 April 1995); doi: 10.1117/12.206976
Show Author Affiliations
Hans Kurt Toenshoff, Laser Zentrum Hannover eV (Germany)
Ludger Overmeyer, Laser Zentrum Hannover eV (Germany)
Ferdinand von Alvensleben, Laser Zentrum Hannover eV (Germany)

Published in SPIE Proceedings Vol. 2375:
Beam Control, Diagnostics, Standards, and Propagation
Lindsay W. Austin; Adolf Giesen; Daniel H. Leslie, Editor(s)

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