High-speed visualization of thermal plasma characteristics

T. Watanabe, T. Hashizume, T. Imatsuji, M. Tanaka

研究成果: 書籍/レポート タイプへの寄稿会議への寄与


Thermal plasmas are expected to be utilized for a number of industrial applications, such as nanomaterial synthesis and waste treatment. The thermal plasma generation and its characteristics remain to be explored for more attractive processing. In particular, the electrode dynamics are one of the most considerable issues for the practical use of industrial applications, because it determines the electrode lifetime and the performance of materials in thermal plasmas. High-speed imaging provides a powerful tool to reveal the plasma dynamics. High-speed video camera with bandpass filter system was used to measure the electrode temperature as well as the arc fluctuation. Electrode temperature was evaluated from the radiation intensities at 785 nm and 880 nm from the electrode thermal emission. This system can be also applied to observe the dynamic behavior of vapor generation from the electrode on the millisecond time scale. Emissions from tungsten vapor were observed at the wavelength of 393 nm. The tungsten electrode started to evaporate just after the peak top of the arc current in the anodic period. The tungsten vapor became the main species in the anodic arc when the electrode started to evaporate. In contrast, a small amount of tungsten evaporation was observed during the cathodic period. These experimental studies enable us to understand the electrode erosion mechanism of the multiphase AC arc. Fundamental researches for electrode phenomena determining thermal plasma characteristics lead to the development of innovative industrial applications of material processing and waste treatment.

ホスト出版物のタイトルSelected Papers from the 31st International Congress on High-Speed Imaging and Photonics
編集者Takeharu Goji Etoh, Hiroyuki Shiraga, Takeharu Goji Etoh
出版ステータス出版済み - 1月 1 2017
イベント31st International Congress on High-Speed Imaging and Photonics - Osaka, 日本
継続期間: 11月 6 201611月 10 2016


名前Proceedings of SPIE - The International Society for Optical Engineering


その他31st International Congress on High-Speed Imaging and Photonics

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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