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| Abstract No.: |
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Scheduled at:
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Wednesday, June 04, 2008, Room 08 10:40 AM
Diagnostics and Sensors 1
Modern process diagnostics offer a lot of possibilities for gaining data for both quality control and process knowledge. The recorded data is the base for process models and enhances the process knowledge
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| Title: |
Innovative high speed camera system diagnostics of plasma torch fluctuations
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| Authors: |
Jochen Schein* / Institute for Plasma Technology and Mathematics, University of the Federal Armed Forces Munich, Germany
Günter Forster / Institute for Plasma Technology and Mathematics, University of the Federal Armed Forces Munich, Germany
Jochen Zierhut/ Institute for Plasma Technology and Mathematics, University of the Federal Armed Forces Munich,
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| Abstract: |
Instabilities in plasma torches can result in poor particle heating and thus a produc-tion of low quality coatings. In order to investigate these fluctuations numerous ex-periments have been performed using high speed cameras taking pictures at a rate of 1000 images/s to create sequences with duration of few seconds total. Individual exposure times are usually in the range of few microseconds. In order to improve upon these parameters a new high speed camera system (HOBAS) was developed, which has been demonstrated to acquire short film sequences at a rate of 106 images/s using exposure times of down to 1ns/image. The camera system is based on a regular CCD camera mated with an MCP, where the MCP is triggered rapidly while the image is moved across the CCD-chip, thus enabling it to record mul-tiple images during the CCD integration interval. Results of investigations will be pre-sented using this instrument to detect plasma jet fluctuations in single electrode and multi electrode plasma torches.
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