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为了明确紫外预电离对主放电的影响,对光子能量为5 eV和10 eV的紫外光预电离后的电子密度分布进行了研究。首先介绍了紫外预电离过程中发生的主要过程,然后建立了紫外预电离的简单模型,再根据模拟结果分析了上述光子能量的紫外光对气体中电子密度分布的影响。模拟结果表明:总气压为50 kPa、光强为103W/cm2时,上述紫外光的有效作用距离分别为0.15 cm和0.5 cm,即使将光强升至106W/cm2,它们的有效作用距离也仅仅分别增加至0.3 cm和0.8 cm,还无法对主放电产生明显的影响;当总气压为10 kPa时,紫外光的有效作用距离分别达到1.1 cm和2.7 cm,可以对主放电产生明显的影响。这说明:在较低的工作气压下,5 eV和10 eV的紫外光均可以产生明显的预电离效果,较低气压可以获得更大的有效预电离区域和更均匀的预电离电子密度。
In order to clarify the influence of UV pre-ionization on the main discharge, the electron density distribution of pre-ionized UV light with 5 eV and 10 eV photons was studied. First, the main process of UV preionization is introduced. Then a simple model of UV preionization is established. According to the simulation results, the influence of the above photon energy UV on the electron density distribution in gas is also analyzed. The simulation results show that when the total pressure is 50 kPa and the light intensity is 103W / cm2, the effective distance of the UV light is 0.15 cm and 0.5 cm respectively. Even if the light intensity is increased to 106 W / cm2, their effective distance is only Respectively, to 0.3 cm and 0.8 cm, respectively, and can not significantly affect the main discharge. When the total pressure is 10 kPa, the effective distance of ultraviolet light reaches 1.1 cm and 2.7 cm, respectively, which can significantly affect the main discharge. This shows that at lower working pressures, both 5 eV and 10 eV UV light can produce significant pre-ionization effects, with lower air pressures resulting in larger effective pre-ionization regions and more uniform pre-ionization electron density.