【作者】 齐玉妍；

【导师】 董丽芳；

【作者基本信息】 河北大学 ， 等离子体物理， 2008， 硕士

【摘要】 采用发射光谱法,研究了氩气及氩气／空气介质阻挡放电中的电子密度、气体温度、电子温度及分子振动温度。通过引入Stark位移,进一步发展了测量电子密度的光谱线型法。研究了大气压氩气／空气介质阻挡放电四边形斑图及六边形斑图中微放电通道的电子密度。利用氮分子发射光谱,研究了两种斑图微放电通道中的分子振动温度。实验发现,由Stark频移与Stark展宽两种方法计算所得的电子密度的值大致相同。当电压增加,四边形斑图演化到六边形斑图时,电子密度及分子振动温度均增大。在大气压及近大气压氩气介质阻挡放电中,通过考虑氩原子696.54 nm发射谱线的各种展宽机制,分离出van der Waals展宽,得到了放电的气体温度。结果表明,气体温度随气体压强的增大而增大。与通过氮分子第一负带(0,0)转动谱线得到的气体温度进行比较,发现同一气压条件下,两种方法计算得到的气体温度一致。研究了介质阻挡放电中电子温度和氮分子振动温度,以及它们随气体压强、外加电压等的变化关系。实验还发现,在氩气／空气混合气体放电中,气体成分及比例极大地影响放电的发光特性和能量传输特性。本工作结果对等离子体斑图形成机制研究及介质阻挡放电的应用具有重要参考价值。更多还原

【Abstract】 Plasma parameters such as electron density, gas temperature, electron temperature and molecular vibration temperature in a dielectric barrier discharge (DBD) in argon or argon/air have been investigated by means of optical emission spectroscopy (OES).The Stark shift is introduced here, which improved the method of measuring electron density by OES. The electron density of an individual microdischarge channel in different stable patterns including a square and a hexagon pattern in a dielectric barrier discharge in argon/air at atmospheric pressure is investigated. Vibrational temperature of individual microdischarge channel in square and hexagon patterns is investigated by using a method of N2 molecules spectra. It is found that the values of electron density deduced from the two methods, Stark shift and Stark broadening, are almost the same. Besides, the electron density and vibrational temperature are all increased from square pattern to hexagon pattern with the increase of applied voltage.The gas temperature is measured in a subatmospheric dielectric barrier discharge by using the van der Waals broadening deduced from several broadening factors of Ar I 696.54 nm spectral line. It is found that the gas temperature in a dielectric barrier discharge increases with the increase of gas pressure. In addition, the gas temperature calculated from the (0,0) band of the N2+negative system is same as that from the van der Waals method under the same gas pressure.The electron temperature and vibrational temperature in a dielectric barrier discharge are investigated as a function of experimental conditions such as gas pressure and applied voltage. It is observed that the component and ratio of gas in gas mixture influence the optical characteristic and energy transfer peculiarity in mixed gas discharge.This work is of great importance to the study of pattern formation mechanism in DBD and applications in industry.更多还原