中文摘要：

利用脉冲调制正弦高压驱动在大气环境中产生了稳定的Ar等离子体射流,并研究了外加电压及脉冲调制对射流的影响。研究结果表明：实验中产生的Ar等离子体射流是一种多脉冲放电,并且在电压的正半周期和负半周期放电大致相当,无明显不同。在无脉冲调制时,外加电压直接影响射流的长度和射流中主要粒子的强度;而增加调制脉冲,射流的长度基本保持不变,但是射流中主要粒子的强度却随着调制占空比的增加线性增强;随着调制频率的增加先增强,到达一定值后再减弱,并且在调制频率从30~500 Hz的变化过程中,粒子强度仍呈现出线性调制特性。因此,调制脉冲可在射流长度保持不变的情况下,线性调控射流中的活性粒子数,为等离子体射流的可控应用提供了一定的研究发展空间。

英文摘要：

The atmospheric pressure, argon plasma-jet was generated by a pulse-modulated sinusoidal high voltage. The influence of the sine voltage and modulation pulse on the characteristics of the plasma-jet was experimentally investi- gated. The results show that the high voltage has a major impact on the jet length and emission intensities of the reactive particles while the modulation pulse only influences the latter greatly of electrons and ions of the jet-plasma. To be specif- ic, the multi-pulse discharge remains unchanged in the positive and negative halves of the voltage;as the pulse frequency increases, the emission intensities of reactive particles change in an increase-decrease mode, being linearly modulated in 30~ 500 Hz,and also increases with an increase of the duty-ratio,which little affects the jet length. We suggest that the modulation pulse should be capable of adjusting the emission intensities of reactive particles of the plasma-jet.