中文摘要：

介质阻挡放电（DBD）实验中观察到了旋转同心圆环斑图。为研究斑图中点的运动状态与DBD参数之间的关系,采用高速录像机短曝光拍照、发射光谱分析及理论模拟等方法研究了DBD放电的旋转同心圆环斑图。斑图由中心点、内圈圆环点和外圈圆环点组成;内外圈圆环上的点均旋转,但具有不同的速度;随着压强的升高,各点旋转速度增大。高速录像机以1个周期为曝光时间拍摄的照片显示,发现每个点均由明亮的体放电和丝状的沿面放电组成。发射光谱分析显示：随着气体压强从30 k Pa增大到50 k Pa时,旋转同心圆环中心点、内圈圆环点和外圈圆环点处的分子振动温度、电子平均能量均降低,而电子密度均增高。通过对旋转同心圆环斑图中体放电电流积分,结合着光谱测量的电子密度,模拟了旋转同心圆环斑图中体放电产生的壁电荷的电势,结果表明沿面放电对放电丝的旋转速度有重要影响。

英文摘要：

Rotating concentric spot-ring patterns are observed in dielectric barrier discharge（DBD） experiments. To study the relation between the spot movement in the patterns and DBD parameters, we studied the patterns through observation using a high-speed video camera, optical emission spectra analysis and theoretical simulation. The pattern consists of a center spot, an inner spot-ring and an outer spot-ring. It is found that the spots in the two spot-rings rotate at different speeds, which increase with pressure. The instantaneous image taken with one-period exposure by the video camera shows that every spot consists of surface discharge and bright volume discharge. The optical emission spectra analysis indicates that when pressure increases to 50 k Pa from 30 k Pa, for all the dots at the two rings and center spot, the molecular vibration temperature and average electron energy decrease, but the electronic density electronic density increases. We also simulated the potential of the wall charges induced by volume discharges based on the current integration of volume discharge in the rotation concentric spot-ring pattern and the measurement of electronic density. The result indicates that surface discharges have great influence upon the rotation speed of the spots.