直流辉光放电正柱区辉纹的形态演变

发布时间：2018-01-27 11:58

本文关键词： 直流辉光放电正柱区辉纹发光亮度形态演变　出处：《中国科学:物理学力学天文学》2017年03期 　论文类型：期刊论文

【摘要】：本文采用石英放电管,在氮、氩和氦气中进行直流辉光放电,改变气压、气体流速和放电电流,正柱区可形成辉纹,且形态逐渐演变.为研究辉纹形态演变,使用可连拍工业相机获得辉纹区照片,通过照片亮度计算分析辉纹亮度分布特点及其变化.结果表明:正柱区辉纹均呈现良好空间周期性;同时,有些放电条件下,辉纹亮度呈现从阴极到阳极逐渐衰减的周期性.与两种惰性气体相比,氮气中的辉纹最为清晰.因此,以氮气辉纹为例,定量研究了辉纹形态(辉纹波长和衰减系数)随放电条件的演变,结果发现:辉纹波长与放电电流密度的对数值几乎呈线性关系;而与气压和气体流速的相关性更为复杂.与此类似,在不同气压和流速条件下,辉纹衰减系数随放电电流的变化趋势也相当一致.
[Abstract]:In this paper, a quartz discharge tube is used for direct current glow discharge in nitrogen, argon and helium gas. By changing the gas pressure, gas flow rate and discharge current, the positive column region can form a glow grain, and the shape gradually evolves. A series of industrial cameras were used to obtain the photos of the flare zone. The characteristics and changes of the luminance distribution were analyzed by calculating the luminance of the photos. The results showed that the stripes in the positive column region all showed a good spatial periodicity. At the same time, under some discharge conditions, the brightness of the glow grain decreases gradually from the cathode to the anode. Compared with the two inert gases, the speckle in the nitrogen gas is the most clear. Therefore, take the pattern of the nitrogen gas as an example. The evolution of ripple shape (ripple length and attenuation coefficient) with discharge conditions is quantitatively studied. The results show that the logarithmic relationship between the ripple length and discharge current density is almost linear. Similarly, under different pressure and velocity, the variation trend of the decay coefficient with discharge current is quite consistent.
【作者单位】：大连理工大学三束材料改性教育部重点实验室;同济大学数学系;
【分类号】：O461.21
【正文快照】： 1引言力保证正柱区的导电性能,因此在这种细长正柱区内,发光亮度沿轴线分布通常更加均匀.正柱区的辉纹现低气压直流辉光放电空间中,从阴极到阳极可以象就是这类细长正柱区内出现的明显周期性亮度分依次出现A s t o n暗区、阴极辉光区、阴极(C r o o k e s)暗布.2 0世纪早期至

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