【摘要】 用发射光谱法对氮气大气压介质阻挡放电等离子体进行了诊断,测出了N2(C3Пu-B3Пg)的337.1nm谱线强度随气体流量、电极间距、放电电压以及放电频率的变化规律.发现光强在气体流量为300mL/min或电极间距为1.5mm时有一个最大值;光强随放电电压及频率的增加而增强,但放电频率或电压增加到某一值时,光强的增强产生了突变,这时放电从丝状介质阻挡放电转变成准辉光介质阻挡放电;测得了放电电压电流波形、电压-电荷李萨如图形、时间分辨的发射光谱,发现丝状介质阻挡放电的微放电通道是随机分布独立存在的,相互不受影响;而准辉光介质阻挡放电的微放电通道之间产生叠加,并相互影响.更多还原

【Abstract】 N₂ dielectric barrier discharges are diagnosticated by optical emission spectrometry, and the relationships between the intensity at 337.1 nm of N₂（C³П_u-B³П_g） and gas flow, electrode gap, voltage and frequency of power supply are obtained. The intensity at 337.1 nm has a maximum value when gas flow rate is 300 mL/min or electrode gap is 1.5 mm; the intensity at 337.1 nm increases when voltage or frequency of power supply increases, but it has a sharp increasing when the voltage or frequency of power supply increases to some extent, at this time, filamentary dielectric barrier discharges transfer into homogeneous dielectric barrier discharges. The voltage and current of power supply and Lissajous figure are measured; in addition, the temporal resolution spectrometry at 337.1 nm is also measured. It is found that the microdischarges of filamentary dielectric barrier discharge are distributed at random, but those of homogeneous dielectric barrier discharges are overlapped and influenced by each other.更多还原