中文摘要：

大气压空气中均匀介质阻挡放电具有广泛的应用前景,实现均匀放电是介质阻挡放电应用关键之一,因而利用上升沿40ns,脉宽70ns的重复频率纳秒脉冲电源激励在大气压空气中产生介质阻挡放电,介绍了纳秒脉冲均匀介质阻挡放电的电特性和放电图像及放电发射光谱,获得了2ns曝光时间的高速摄影放电图像。发现空气中1mm气隙距离下可以实现均匀放电,气隙距离增加至4mm时放电转变为明显的丝状放电,通过观察发射光谱显示等离子体谱线主要是来自400nm以下的氮分子第二正系。结果证实了大气压空气中利用ns脉冲激励可以产生稳定介质阻挡放电,且能实现均匀放电,是典型非平衡态低温等离子体。

英文摘要：

Dielectric barrier discharge（DBD} in atmospheric air has a promising application for plasma excitation, and a homogeneous discharge is important for dielectric barrier discharge applications. Consequently, a repetitive nanosecond-pulse generator with 40 ns rise time and 70 ns pulse duration was used to drive dielectric barrier discharge in air at atmospheric pressure. Discharge characteristic, images, and emission spectra of the nanosecond- pulse DBD were presented. Especially, fast images were taken using one ICCD camera with an exposure time of 2 ns. The experimental results show that the discharge is in a homogeneous mode when the air gap is lmm, and it will be changed to a filamentary mode when the air gap is increased to 4 mm. The emission spectra of the discharge indicate that the spectra are mainly from nitrogen species of second positive system below 400 nm. The results indicate that the usage of nanosecond pulses can produce a stable dielectric barrier discharge in atmospheric air, especially results in a homogeneous discharge under some conditions, and the excited plasma is a low-temperature plasma with a highly non-equilibrium state.