光学学报, 2017, 37 (4): 0430002, 网络出版: 2017-04-10
介质阻挡放电羽的等离子体参数光学诊断 下载: 503次
Optical Diagnosis on Plasma Parameters of a Plasma Plume Generated by Dielectric Barrier Discharge
光谱学 介质阻挡放电 等离子体喷枪 等离子体子弹 发射光谱 电子密度 spectroscopy dielectric barrier discharge plasma jet plasma bullet optical emission spectrum electron density
摘要
利用介质阻挡放电装置在大气压下产生了稳定的氩气等离子体羽,利用示波器对等离子体羽的外加电压、电流和发光信号进行了记录。光学诊断结果表明,等离子体羽由高速运动的等离子体子弹组成。基于碰撞辐射模型,利用300~800 nm范围的光学发射谱诊断了等离子体羽的电子密度。结果表明,电子密度随外加电压和气体流量的增大而增大,随驱动频率的增大而减小。利用光谱法对等离子体羽的振动温度和转动温度进行了研究,发现其振动温度和转动温度均随外加电压和气体流量的增大而升高,随驱动频率的增大而降低。通过分析放电电场,对以上现象进行了定性解释。
Abstract
A stable argon plasma plume is generated at atmospheric pressure by a plasma jet in dielectric barrier discharge configurations. The applied voltage, the current and the light emission signal are simultaneously recorded by an oscilloscope. Results indicate that the plasma plume is composed of successive fast-moving plasma bullets. Based on collisional-radiative model, the electron density of the plasma plume is investigated by optical emission spectrum in the range from 300 nm to 800 nm. Optical diagnosis shows that the electron density increases with the increasing applied voltage or gas flow rate. However, it decreases with the increasing driving frequency. The vibrational temperature and the rotational temperature of the plasma plume are also studied by optical emission spectroscopy. It is found that both of them increase with the increasing applied voltage or gas flow rate, and decrease with the increasing driving frequency. The aforementioned phenomena are qualitatively explained by analyzing the electric field of discharge.
李亚茹, 李雪辰, 贾鹏英, 张盼盼, 耿金伶. 介质阻挡放电羽的等离子体参数光学诊断[J]. 光学学报, 2017, 37(4): 0430002. Li Yaru, Li Xuechen, Jia Pengying, Zhang Panpan, Geng Jinling. Optical Diagnosis on Plasma Parameters of a Plasma Plume Generated by Dielectric Barrier Discharge[J]. Acta Optica Sinica, 2017, 37(4): 0430002.