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17 April 1995 Closed-loop control of material processing with high-power CO2 lasers
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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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Kurt Toenshoff, Ludger Overmeyer, and Ferdinand von Alvensleben "Closed-loop control of material processing with high-power CO2 lasers", Proc. SPIE 2375, Beam Control, Diagnostics, Standards, and Propagation, (17 April 1995);


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