光谱学与光谱分析, 2015, 35 (1): 56, 网络出版: 2015-01-28  

介质阻挡放电中单个新型放电丝放电特征和光谱测量

Discharge Characteristic and Spectrum Measurement of a New Type of Single Filament in a Dielectric Barrier Discharge
作者单位
1 河北大学物理科学与技术学院, 河北 保定 071002
2 河北大学质量技术监督学院, 河北 保定 071002
摘要
在放电间隙较大(d=3.8 mm)的介质阻挡放电(DBD)中, 通过减小放电区域(S=1 cm×1 cm), 首次观察到了单个新型放电丝。与其他实验小组所观察到的单个放电丝相比, 该单个新型放电丝由体放电(VD)和沿面放电(SD)二部分构成, 其放电稳定性和持续性极好。利用高速照相机和光谱仪, 研究了单个新型放电丝在外加电压半周期单次放电中的放电特征和单个新型放电丝侧面放电柱不同位置的等离子体状态。在高速照相机不同曝光时间条件下拍摄得到了单个新型放电丝端面和侧面放电的瞬时照片, 并对其外加电压半周期单次放电的放电特征与辉光放电进行了对比。利用发射光谱法, 采集了单个新型放电丝侧面放电柱不同位置的氩原子763.26 nm(2P6→1S5)和772.13 nm(2P2→1S3)发射谱线, 并通过两条谱线强度比法, 估算出了相应的电子激发温度。实验结果得出: 单个新型放电丝由体放电和沿面放电构成, 且沿面放电在体放电四周呈枝状扩散;单个新型放电丝在外加电压半周期单次放电中与辉光放电特征相似, 且在阴极呈现出漏斗状放电;氩原子谱线强度及其相应的电子激发温度从极板两端到中间均呈减小的变化趋势, 表明单个新型放电丝侧面放电柱不同位置的等离子体状态不同。
Abstract
A new type of single filament was observed in a dielectric barrier discharge (DBD) system for the first time. It was formed with a larger discharge gap (d=3.8 mm) and a smaller discharge area (S=1 cm×1 cm) in an air/argon gas mixture. Compared with the single filament observed by other experimental groups, the new type of single filament is composed of volume discharge (VD) and surface discharge (SD). In addition, the single filament has excellent discharge stability and sustainability. In order to study more about the discharge characteristic of the new type of single filament in a half-cycle of the applied voltage and the plasma state in different positions of the discharge column in the side view of the new type of single filament, both a high speed framing camera (HSFC) and a spectrograph were used in the experiment. The instantaneous images of end and side view of the new type of single filament were taken by the HSFC with different exposure time, and the discharge characteristic of the new type of single filament in a half-cycle of the applied voltage was compared with that of glow discharge. The spectral lines of Ar Ⅰ 763.26 nm (2P6→1S5) and Ar Ⅰ 772.13 nm (2P2→1S3) in different positions of the discharge column of the new type of single filament were measured by using optical emission spectra, and chosen to estimate the corresponding electron excitation temperature by the relative intensity ratio method. It was found that the new type of single filament is composed of VD and SD, and SD produces a dendritic discharge around VD. The discharge characteristic of the new type of single filament in a half-cycle of the applied voltage is similar to that of glow discharge, and a funnel-shaped discharge emerges at the instantaneous cathode. The spectral line intensity and the corresponding electron excitation temperature all decrease with the distance away from the electrodes, indicating that the plasma state in different positions of the discharge column in the side view of the new type of single filament is different.

赵龙虎, 潘宇扬, 董丽芳, 高烨楠, 王永杰. 介质阻挡放电中单个新型放电丝放电特征和光谱测量[J]. 光谱学与光谱分析, 2015, 35(1): 56. ZHAO Long-hu, PAN Yu-yang, DONG Li-fang, GAO Ye-nan, WANG Yong-jie. Discharge Characteristic and Spectrum Measurement of a New Type of Single Filament in a Dielectric Barrier Discharge[J]. Spectroscopy and Spectral Analysis, 2015, 35(1): 56.

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