中文摘要：

研究氧气的添加对射流放电特性的影响对获得含氧高活性的低温等离子体具有重要意义。本文通过电压-电流波形测量、发光图像拍摄以及光谱分析等诊断手段研究了氧气添加对Ar气等离子体射流特性的影响,计算了放电功率和传输电荷量等重要放电电气参量以及分子转动温度、分子振动温度和电子激发温度等等离子体参量,研究了这些参量、射流模式和射流长度等随氧气含量变化规律,并结合放电机理对实验结果进行分析。结果表明,氩氧射流等离子体放电可分为电晕放电、介质阻挡放电和射流放电三个阶段,氧含量对等离子体射流的影响主要表现在射流放电阶段,氩气中加入氧气后电流脉冲个数增多,脉冲持续时间增加,随着含氧量的增加射流长度变短,放电功率和传输电荷下降。加入氧气后发射光谱中大部分谱线强度都随着氧含量的增加而有所减小,但OH谱线强度在氧气浓度为0.5%时达到最大值,转动温度和振动温度均随氧含量的增大而略有升高,氧含量为0.5%时等离子体射流的电子激发温度为0.637 eV。

英文摘要：

The influence of an addition of oxygen on the discharge characteristics of atmospheric pressure argon plasma was investigated with conventional plasma diagnose tools. Three distinct types of discharge were identified, including the corona discharge,dielectric barrier discharge,and jet discharge of the argon / oxygenplasma. The preliminary results show that the oxygen concentration has a major impact on the jet discharge and reactivity of plasma. For example,as the oxygen concentration increased,the number of current pulse and pulse duration increased; and the jet-length,discharge power,and transported charge decreased. Moreover,most emission peaks were found to decrease with an increase of oxygen concentration,except the OH peak. At an oxygen concentration of 0. 5%,the electron excitation temperature was 0. 637 eV; and the peak of OH radicals reached its maximum,possibly because of the optimized concentration of highly reactive atomic oxygen.