点击次数：

论文类型：期刊论文

发表时间：2016-01-01

发表刊物：VACUUM

收录刊物：EI、SCIE、ISTIC

卷号：123

页面范围：49-53

ISSN号：0042-207X

关键字：Surface DBD; Morphological image; Discharge uniformity; Discharge area; Gas component and velocity

摘要：The discharge uniformity and area of surface dielectric barrier discharge (DBD) has recently attracted lots of attention. In this study, morphological images of surface DBD are acquired by an intensified chargecouples device (ICCD) camera from the top view of the exposed electrode. Spatial and transient characteristics of plasma have been visualized with the gate width of 5 gs and 120 gs The discharge uniformity and discharge area are respectively estimated by calculating the number of pixels and the full width at half maximum (FWHM) of gray frequency by MATLAB software with microsecond time scale. The results offer a new estimated method for the characteristics of homogenous discharge. The formation of diffuse plasma mainly depends on an increase of the ionization coefficient and a creation of sufficient seed electrons by the Penning Effect at low electric fields. Accordingly, experimental measurements show that the diffuse discharge with a larger area behaves a good uniformity and stability comparing with the filamentary discharge. Applied frequency is not capable of exerting significant influence on the discharge uniformity and area. By adding noble gases into N-2, the diffuse distharge is more likely to form. And the diffuse discharge also can be stabilized by the helium flow with gas velocity of 0.6-0.8 cm/s. (C) 2015 Elsevier Ltd. All rights reserved.