介質(zhì)阻擋放電中兩種亮暗點菱形斑圖的光譜研究
發(fā)布時間:2019-04-20 12:09
【摘要】:空氣和氬氣混合氣體的雙水電極介質(zhì)阻擋放電裝置中,在電壓升高過程中首次發(fā)現(xiàn)了兩種由亮點和暗點組成的亮暗點菱形斑圖。通過觀察斑圖照片可以發(fā)現(xiàn):第一種菱形斑圖(菱形斑圖Ⅰ)中的暗點處于由亮點組成的菱形單元的中心;第二種菱形斑圖(菱形斑圖Ⅱ)中的暗點恰好處于周圍其他三個亮點的中心位置。利用發(fā)射光譜法,通過采集氮分子(N_2)第二正帶系(C~3Π_u→B~3Π_g)發(fā)射譜線和氬原子696.54nm(2P_2→1S_5)譜線的展寬,研究了兩種菱形斑圖中亮點和暗點的分子振動溫度和電子密度。實驗發(fā)現(xiàn):兩種菱形斑圖中暗點的分子振動溫度均高于亮點,相對菱形斑圖Ⅰ來說,菱形斑圖Ⅱ中的亮點和暗點的分子振動溫度均升高;而菱形斑圖Ⅰ中暗點的電子密度低于亮點,菱形斑圖Ⅱ中亮點和暗點的電子密度卻幾乎相等。兩種菱形斑圖中電子密度表現(xiàn)出不同的變化趨勢,且在菱形斑圖Ⅱ中表現(xiàn)出的規(guī)律尤為特殊,因而采用高速錄像機對菱形斑圖Ⅱ進行短曝光拍攝觀察斑圖中亮點和暗點的成分,發(fā)現(xiàn)暗點是體放電和沿面放電共存的狀態(tài)。進一步研究從菱形斑圖Ⅰ到菱形斑圖Ⅱ的演化過程中三種斑圖中亮點的電子密度,結(jié)果發(fā)現(xiàn):演化中間過程的斑圖中的亮點的電子密度最大,菱形斑圖Ⅱ中亮點的電子密度最低。實驗結(jié)果對于研究斑圖的自組織形成過程具有參考作用。
[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,
本文編號: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,
本文編號:2461594
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