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Ionization effect on arc plasma's optical diagnosis by the measurement of the refractive index

机译：通过测量折射率对电弧等离子体光学诊断的电离作用

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摘要

The effect of arc plasma ionization on its temperature diagnosis by the measurement of the refractive index is discussed. The refractive index of arc plasma in two conditions is compared: 1) only the first ionization is considered and 2) both the first and second ionizations are considered. In order to facilitate plasma temperature reconstruction, two corresponding refractive index models are deduced. For the sake of making this study universal, both the monatomic and dual-atomic molecule arc plasmas are chosen as typical examples for theoretical deduction and analysis. A condition, which can be adopted to estimate whether the second ionization should be considered in temperature reconstruction, is proposed. Finally, an argon arc plasma is chosen as an example for experiment, and the experimental results match well with the theoretical analysis. This study is crucial to arc plasma's optical diagnosis, which is based on the measurement of the refractive index.
机译：通过测量折射率，讨论了电弧等离子体电离对其温度诊断的影响。比较了两个条件下电弧等离子体的折射率：1）仅考虑了第一电离，并且2）考虑了第一和第二电离。为了促进等离子体温度的重建，推导了两个相应的折射率模型。为了使这项研究具有普遍性，选择单原子和双原子分子电弧等离子体作为理论推论和分析的典型例子。提出了可以用来估计在温度重建中是否应考虑第二次电离的条件。最后以氩弧等离子体为例进行了实验，实验结果与理论分析吻合良好。这项研究对电弧等离子体的光学诊断至关重要，该诊断基于折射率的测量。

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