中文摘要：

为研究在大气压氦气中斑图放电与辉光放电的转换，利用高频高压电源进行了大气压氦气介质阻挡放电（DBD）试验。通过测量外加电压与回路电流随时间变化的波形，并利用增强型电荷耦合器件（intensifiedchargecoupleddevice，ICCD）相机同时拍摄电极侧面和底面的短时曝光放电图像，研究了斑图放电和辉光放电的放电模式以及2种放电模式的转换规律。研究结果显示：放电起始时放电空间出现斑图放电，每个斑图放电单元经历了由汤森放电向辉光放电的演化过程；放电起始后降低外加电压，可得到稳定的单脉冲辉光放电；升高外加电压，回路电流逐渐变成双脉冲，斑图放电单元面积变小，放电单元数增多，放电逐渐均匀；外加电压升高到回路电流变为3脉冲及以上时放电转化为多脉冲辉光放电。以上结果证明：单个回路电流波形不能用来判断放电的均匀性；随着外加电压的升高，斑图放电向辉光放电的转换过程实质上是局部辉光放电向整体辉光放电的演化过程。

英文摘要：

In order to study the conversion of spational-temporal patterned discharges to glow discharges in atmospheric helium, dielectric barrier discharges {DBDs） were obtained using a high-frequency power supply in atmospheric helium. Waveform of the applied voltage and loop current were measured and short exposure time discharge photos were taken with an intensified charge-couple device {ICCD} to investigate the characteristics of spatio-temporal patterned discharges, especially their conversion to glow discharges. The characteristics of glow discharges were also discussed. The results showed that spatio-temporal patterned discharges occurred when the applied voltage was high enough. Each pattern shared similar characteristics with a glow discharge and its physical process started from a Townsend discharge to a glow one. After a patterned discharge generated, a single-pulse glow discharge could be achieved when the applied voltage was adjusted to a lower voltage, a two-pulse discharge appeared at a higher voltage. At the same time, the radial size of each pattern became smaller, however, the number of the discharge channels increased. It is found that, with an increasing applied voltage, the discharge becomes uniform gradually and turns into multi-pulse glow discharges. The discharge current can not be used to diagnose the discharge mode. The conversion of a spatio-temporal patterned discharge to a glow barrier discharge with the increasing applied voltage is a progress that the discharge changed from a partial APGD {atmospheric pressure glow discharze） to a whole APGD.