介质阻挡放电不同边界放电区域的光谱分析

Spectral Analysis of Different Boundary Discharge Domain in Dielectric Barrier Discharge

利用大直径双水电极介质阻挡放电装置,在氩气和空气的混合气体中观察到了相同实验条件下不同边界的放电区域出现不同放电模式的实验现象。其中正方形封闭边界内可形成规则的斑图,而半开放放电区域只能看到随机游走的放电丝。通过采集发射光谱发现封闭边界内激发能较高的几条谱线如696.5,727.3,750.4和772.4nm的相对强度随电压的升高而增大,半开放边界内这几条谱线的相对强度随电压的升高略有下降。此结果表明封闭边界内的电子平均能量要高于半开放边界,并且差别随电压增大而增加。利用氮分子第二正带系谱线计算得到的分子振动温度结果显示封闭边界内的分子振动温度随电压增大而升高,半开放边界内分子振动温度随电压增大而下降。

Different discharge modes in different boundary discharge domains at the same experimental condition are observed in argon/air mixture in a dielectric barrier discharge system with two large diameter water electrodes.Regular patterns and random filaments are formed in the closed square boundary and the semiopen domain respectively.It is found that the relatively intensity of the several higher excitation energy spectral lines such as 696.5,727.3,750.4 and 772.4 nm increases with the applied voltage in the closed boundary domain while decreases in the semiopen domain.Results show that the electron average energy in the closed boundary is higher than that in the semiopen domain and the difference of the electron average energy increases with the applied voltage.The results of molecular vibration temperature estimated by the second positive spectrum of N2 molecular indicate that the vibration temperature increases with the applied voltage in the closed boundary and decreases with the applied voltage in the semiopen boundary domain.