基金项目:
国家自然科学基金(51307133;
51521065;
51477135);
国家重点基础研究发展计划(973计划)(2015CB251003);
中国博士后科学基金(2016M590946);
中央高校基本科研业务费专项基金(xjj2016003);
电力设备电气绝缘国家重点实验室基金(EIPE16314);
Project supported by National Natural Science Foundation of China (51307133, 51521065, 51477135), National Basic Research Program of China (973 Program) (2015CB251003), China Postdoctoral Science Foundation (2016M590946), Fundamental Research Funds for the Central Universities (xjj2016003), State Key Laboratory of Electrical Insulation and Power Equipment (EIPE16314);
Atmospheric pressure low temperature plasma is rich of active species and has potential application value in different fields. In this paper, the electrical and optical characteristics of atmospheric pressure parallel plate dielectric barrier discharge (DBD) in helium, including the discharge current peak, discharge power, first breakdown voltage, stable breakdown voltage, emission spectrum and discharge images, are studied by changing the applied voltage frequency. It is found that stable uniform discharge is easier to be produced with higher applied voltage frequency. When applied voltage frequency increases, the stable and first breakdown voltages decrease and increase slightly, respectively. Some nonlinear phenomenon appears in He DBD under some special applied voltage frequencies. By taking discharge images (exposure time ~μs) and optical spectra, it is found that the He DBD presents to be glow discharge in the range of 10~90 kHz; the line intensity of excited OH increases more obviously than that of excited N2 and N2+.
KEY WORDS :atmospheric pressure helium;dielectric barrier discharge;applied voltage frequency;electrical and optical characteristics;multi-periods behavior;
图10
r(OH/He), r(N2/He)和r(N2+/He)随外施电压频率变化
Fig.10
r(OH/He), r(N2/H) and r(N2+/He) changed with applied voltage frequency
He DBD均具有较均匀的辉光放电结构,且放电正柱发光区域会随着频率的增加而有所缩小,并逐渐集中于放电间隙中央,说明带电粒子更多地被束缚在了气隙中部。此外,不同频率He DBD发射光谱的研究发现:r(OH/He)随着频率的增加呈现出近似线性上升的趋势,而r(N2/He)和r(N2+/He)变化较小。说明相较于N2+,激发态OH产生效率对亚稳态He原子数密度可能更加敏感。
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