大气压射流等离子体放电特性及其灭菌效果

 介绍了一种同轴电极的射流等离子体发生装置，可以直接在大气中将生成的氦气辉光放电射流等离子体喷出进行杀菌消毒，无需反应容器和真空系统，并从电压、频率、流速等方面讨论了该同轴等离子体发生器的放电特性。在稳定的放电条件下，利用实验装置进行了大气压下的等离子体灭菌实验，验证了本装置在等离子体灭菌应用上的可行性和易操作性。灭菌结果表明：在最初的2 min内，细菌减小趋势明显，3 min后细菌几乎全部消亡。

Discharge characteristics of plasma jet at atmospheric pressure and its sterilization efficacy

A plasma jetting system with the use of the coaxial dielectric barrier electrodes is introduced. It can create glow discharge helium plasma in the air, and be applied to sterilization without both reaction vessel and vacuum system. Some factors such as the electrode voltage, the frequency of power supply and the gas flow rate are considered to recognize the features of the plasma created. Higher voltage between electrodes will lead to larger discharge current, and the peak discharge current moves forward in each voltage half cycle. But over-loaded voltage will cause filamentary discharge, which is not expected in the experiment. Increasing the frequency of supply power will give rise to the peak value of discharge current and the ejection distance of the plasma. In addition, faster gas flo