介质阻挡放电中两种亮暗点菱形斑图的光谱研究
发布时间:2019-04-20 12:09
【摘要】:空气和氩气混合气体的双水电极介质阻挡放电装置中,在电压升高过程中首次发现了两种由亮点和暗点组成的亮暗点菱形斑图。通过观察斑图照片可以发现:第一种菱形斑图(菱形斑图Ⅰ)中的暗点处于由亮点组成的菱形单元的中心;第二种菱形斑图(菱形斑图Ⅱ)中的暗点恰好处于周围其他三个亮点的中心位置。利用发射光谱法,通过采集氮分子(N_2)第二正带系(C~3Π_u→B~3Π_g)发射谱线和氩原子696.54nm(2P_2→1S_5)谱线的展宽,研究了两种菱形斑图中亮点和暗点的分子振动温度和电子密度。实验发现:两种菱形斑图中暗点的分子振动温度均高于亮点,相对菱形斑图Ⅰ来说,菱形斑图Ⅱ中的亮点和暗点的分子振动温度均升高;而菱形斑图Ⅰ中暗点的电子密度低于亮点,菱形斑图Ⅱ中亮点和暗点的电子密度却几乎相等。两种菱形斑图中电子密度表现出不同的变化趋势,且在菱形斑图Ⅱ中表现出的规律尤为特殊,因而采用高速录像机对菱形斑图Ⅱ进行短曝光拍摄观察斑图中亮点和暗点的成分,发现暗点是体放电和沿面放电共存的状态。进一步研究从菱形斑图Ⅰ到菱形斑图Ⅱ的演化过程中三种斑图中亮点的电子密度,结果发现:演化中间过程的斑图中的亮点的电子密度最大,菱形斑图Ⅱ中亮点的电子密度最低。实验结果对于研究斑图的自组织形成过程具有参考作用。
[Abstract]:In the dielectric barrier discharge (DBD) device of air and argon gas mixture, two bright and dark diamond patterns composed of bright spots and dark points have been discovered for the first time in the process of voltage rise. It can be found that the dark points in the first rhombic pattern (rhombus pattern I) are at the center of the diamond unit composed of bright spots. The dark spots in the second rhombus pattern (rhombus pattern 鈪,
本文编号:2461594
[Abstract]:In the dielectric barrier discharge (DBD) device of air and argon gas mixture, two bright and dark diamond patterns composed of bright spots and dark points have been discovered for the first time in the process of voltage rise. It can be found that the dark points in the first rhombic pattern (rhombus pattern I) are at the center of the diamond unit composed of bright spots. The dark spots in the second rhombus pattern (rhombus pattern 鈪,
本文编号:2461594
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