大气压射流等离子体中O及OH自由基的发射光谱在线诊断
On-line diagnosis of O and OH radical in atmospheric pressure plasma jet by optical emission spectroscopy
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摘要: OH自由基及氧原子在大气化学、表面处理及化学污染物分解等方面有着重要的作用。利用发射光谱技术在线测量了大气压射流等离子体中OH自由基紫外波段与O自由基777，844 nm波段的发射光谱。研究了OH自由基与氧原子光谱强度随放电功率及放电体系中所加入的氧浓度的变化。将实验测得的OH自由基光谱图与用Lifbase数据库模拟光谱图进行比较，估算了OH自由基的转动温度。结果表明：OH自由基的转动温度随放电功率的增加而增加，随工作气体流速的增加而减小。Abstract: The hydroxyl radical(OH) and oxygen atom(O) play important roles in atmospheric chemistry, surface treatment and chemical decontamination. The present work reports the measurement of OH and O in atmospheric pressure plasma jet by optical emission spectroscopy. The OH and O are observed in discharges of the H2O/O2/Ar mixture. The effects of discharge power and O2 addition in discharge system on the emission intensity of OH and O are studied. By comparing the measured emission spectrum of OH with that simulated from Lifbase data, the rotational temperature is evaluated for OH.It is shown that the rotational temperature of OH increase with the increase of discharge power,and decrease with the increase of discharge gas flow rate.
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Key words:
- atmospheric pressure plasma /
- jet /
- radical /
- optical emission spectroscopy /
- plasma diagnosis
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