环境空气中射频微等离子体射流中的杂质侵入
Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air
摘要：
利用可调谐二极管激光吸收光谱技术测量了大气压射频微等离子体射流中氦亚稳态原子的时空分辨浓度。空间分布以及寿命测量表明，从前喷嘴进入放电的空气和来自气体供应系统的杂质的显着影响。淬火的可吸收性是用来推断定量浓度的侵入杂质。从光学发射光谱以及它们对通过射流的进料气流的依赖性确定沿射流轴的杂质分布。
英文摘要：
Space and time resolved concentrations of helium metastable atoms in an atmospheric pressure radio-frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. Spatial profiles as well as lifetime measurements show significant influences of air entering the discharge from the front nozzle and of impurities originating from the gas supply system. Quenching of metastables was used to deduce quantitative concentrations of intruding impurities. The impurity profile along the jet axis was determined from optical emission spectroscopy as well as their dependance on the feed gas flow through the jet.
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