ＣＡＲＳによる温度・数密度計測　（プラズマジェットへの応用）

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  • Measurement of Temperature and Number Density by CARS. (Application of CARS to Plasma Jets).
  • CARS ニ ヨル オンド スウ ミツド ケイソク プラズマ ジェット エ ノ

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The Q-branch multiplex CARS method has been applied to simultaneous measurement of the distributions of the rotational temperature and number density in pure nitrogen plasma jets. Temperature and number density are measured by comparing an experimental CARS spectrum with a theoretical one. The plasma jets are produced by DC discharge (150A, 14-16V) and expanded to an evacuated chamber. Because of relatively low ionization, the signal of CARS is strong enough to measure temperature and number density of molecules in the electronic ground state. For backpressure of less than 20 Torr, shock waves of jets are observed, which correspond to the distribution of measured temperature and number density along the centerline of jets. However, for backpressure of more, than 50 Torr, the flow becomes subsonic and the shock waves disappear. The effect of the pressure deviation and the fraction of excited nitrogen to the theoretical spectrum are investigated through evaluation of the error of temperatre and number density.

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