アルゴン‐水素混合ガスアークにおける種々の分光スペクトルからのプラズマ状態評価

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  • Plasma structures in Ar-H2 mixed gas tungsten arcs determined by some spectroscopic measurements.
  • アルゴンー スイソ コンゴウ ガスアーク ニ オケル シュジュ ノ ブンコウ

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In a previous report, different temperature distributions in Ar-H2 mixed gas tungsten arc had been evaluated from an argon atom line (Ar I), hydrogen atom line (H I) and ionized argon line (Ar II) intensities by emission spectroscopic measurements.<BR>In order to find a solution to these inconsistent results, a new spectroscopic method (named as Ar I-H I correlation method) was developed in which the temperature was estimated from the correlation between Ar I and H I intensities in the assumption of a local thermodynamic equilibrium (LTE) and heterogeneous of plasma gas composition.<BR>The temperature distribution by the Ar I-H I correlation method showed good agreement with that by the Ar I-Ar II correlation method reported in another paper. From this fact, it was shown that the consistent temperature distribution was led using Ar I, Ar II and H I line intensities. Furthermore, electron density distributions were determined without the assumption of LTE by both Stark broadening method of hydrogen atom line Hβ and method of infrared plasma diagnostics, and showed good agreement with electron density distributions calculated using Saha relations from the local plasma gas composition and temperature obtained by Ar I-H I correlation method.<BR>All of the results led to the conclusion that the performed spectroscopic analysis of argon-hydrogen gas arc plasma, under the assumption of LTE, was valid and effective, and that the hydrogen gas concentrated near the cathode and the temperatures in the whole plasma region was remarkably lower than the temperatures in a pure argon gas arc.

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