大面积沿面放电等离子体温度的光谱研究

设计了水电极放电装置，在空气/氩气混合气体中实现了大面积沿面放电。采用发射光谱法，对分子振动温度、电子平均能量和电子激发温度等随气压的变化进行了研究。根据氮分子第二正带系(C3Π_u→B3Π_g)的发射谱线计算出氮分子的振动温度;使用Ar 763.51 nm(2P₆→1S₅)和772.42 nm(2P₂→1S₃)的两条发射谱线的强度比得到电子激发温度;通过氮分子离子391.4 nm和氮分子337.1 nm两条发射谱线的相对强度之比得出了电子的平均能量的变化。实验研究了发射光谱随气压的变化，发现其强度随着气压的增加而增强，且其整个轮廓和谱线强度之比也发生变化。随着气压从0.75×105Pa升高到1×105Pa，分子振动温度、电子激发温度和电子能量均呈下降趋势。

Study on Plasma Temperature of a Large Area Surface Discharge by Optical Emission Spectrum

A large area surface discharge was realized in air/argon gas mixture by designing a discharge device with water electrodes. By using optical emission spectrum, the variations of the molecular vibrational temperature, the mean energy of electron, and the electronic excitation temperature as a function of the gas pressure were studied. The nitrogen molecular vibrational temperature was calculated according to the emission line of the second positive band system of the nitrogen molecule (C3Π_u→B3Π_g). The electronic excitation temperature was obtained by using the intensity ratio of Ar Ⅰ 763.51 nm(2P₆→1S₅) to Ar Ⅰ 772.42 nm (2P₂→1S₃). The changes in the mean energy of electron were studied by the relative intensity ratio of the nitrogen molecular ion 391.4 nm to nitrogen 337.1 nm. It was found that the intensity of emission spectral line increases with the increase in the gas pressure, meanwhile, the outline and the ratios of different spectral lines intensity also change. The molecular vibrational temperature, the mean energy of electron, and the electronic excitation temperature decrease as the gas pressure increases from 0.75×105Pa to 1×105 Pa.