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Caixia LI, Jianyu FENG, Shuchang WANG, Cheng LI, Junxia RAN, Yuyang PAN, Lifang DONG. Formation mechanism of bright and dark concentric-ring pattern in dielectric barrier discharge[J]. Plasma Science and Technology, 2024, 26(8): 085401. DOI: 10.1088/2058-6272/ad386a
Citation: Caixia LI, Jianyu FENG, Shuchang WANG, Cheng LI, Junxia RAN, Yuyang PAN, Lifang DONG. Formation mechanism of bright and dark concentric-ring pattern in dielectric barrier discharge[J]. Plasma Science and Technology, 2024, 26(8): 085401. DOI: 10.1088/2058-6272/ad386a

Formation mechanism of bright and dark concentric-ring pattern in dielectric barrier discharge

  • In this work, a bright and dark concentric-ring pattern is reported in a dielectric barrier discharge for the first time. The spatiotemporal dynamics of the bright and dark concentric-ring pattern are investigated with an intensified charge-coupled device and photomultiplier tubes. The results indicate that the bright and dark concentric-ring pattern is composed of three concentric-ring sublattices. These are bright concentric-ring structures, dark concentric-ring structures and wider concentric-ring structures, respectively. The bright concentric-ring structures and dark concentric-ring structures are alternately distributed. The bright concentric-ring structures are located at the centre of the wider concentric-ring structures. The wider concentric-ring structures first form from the outer edge and gradually develop to the centre. The essence of all three concentric-ring structures is the individual discharge filaments. The optical emission spectra of different sublattices are acquired and analysed. It is found that the plasma parameters of the three concentric-ring sublattices are different. Finally, the formation mechanism of the bright and dark concentric-ring pattern is discussed.
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