Memoirs of the Faculty of Engineering, Yamaguchi University

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Memoirs of the Faculty of Engineering, Yamaguchi University Volume 30 Issue 1
published_at 1979

The Dynamic-Electrostatic Probe in Low Temperature High Pressure Plasma Stream

低温高圧力プラズマ流に対する動的静電探針
Saeki Setsuo
Osaki Katashi
Yoshimura Takaharu
Niyada Masateru
fulltext
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KJ00000156275.pdf
Descriptions
One of the plasma diagnostics, probe method can make local measurement and be done by extremely simple device. As the probe is immersed in the low temperature high pressure plasma stream, it becomes so hot that it could emit electrons or vaporize, further more overheating of it could cause sputtering of its material. The measurements were carried out using a moving electrostatic probe, which crossed the jet in the radial direction at the speed of 1.4 m/sec. A number of measurements were made along the center line of the jet. Experiments were made at arc current of 100A, Argon gas flow rate 4 l/min. The electron temperature at the center of the jet and 2mm from the nozzle exit was 14,900K, and was in agree with that by the spectroscopic method. The electron temperature for radial survey dropped more quickly than that for axial survey. The electron density at the center of the jet and 2mm from the nozzle exit was 8.2×(10)^<19>m^<-3>, and that for radial survey decrease more quickly than that for axial survey. The electron density was fewer than that of Grey's experiment by approximately 3 order.