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29 May 2001 Controlled CO2 laser cutting on the border to beginning of plasma
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The content of the presented work is an experimental investigation in the border range between inert gas melt cutting and the plasma generation point. Based on spectral emission measurements, a photo detector with a wavelength sensitivity of 400 - 800 nm was found to be suitable for detecting the development of plasma. The detector was positioned behind a coated ZnSe mirror to measure the process signal coaxially. Parameter investigations show the influence of the cutting gas pressure and feed rate on the ignition of plasma. By increasing the feed rate to the maximum cutting speed, the amplitude of sudden plasma sparking increases. To avoid this effect, a concept for a closed-loop control system in order to eliminate the plasma sparking is presented.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hans Kurt Toenshoff, Andreas Ostendorf, and Bernd Thiessen "Controlled CO2 laser cutting on the border to beginning of plasma", Proc. SPIE 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics, (29 May 2001);

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