论文标题
脉冲调制频率对氦气大气压等离子体射流特性的影响
Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics
论文作者
论文摘要
这项工作研究了脉冲调制频率的影响，范围从50 Hz-10 kHz对氦气RF大气压力等离子体的基本特性。调节频率对等离子体喷射排放行为，几何变化，反应性物种发射和等离子体参数（气温TG，电子激发温度TEXC和电子密度（NE）的影响与较高的调制频率相比，血浆尺寸，更高的电子密度和更大的光发射（即He I，O，O，OH，N2+等），与较高的调制频率相比。还讨论了10-40％的占空比的属性，更重要的是，通过在10-20％的占空比的情况下，对RF等离子体的较短等离子体的长度进行了综合。
This work investigates the influence of pulse modulation frequency ranging from 50 Hz- 10 kHz on the helium RF atmospheric pressure plasma jet's fundamental characteristics. The impact of modulation frequency on plasma jet discharge behavior, geometrical variation, reactive species emission, and plasma parameters (gas temperature Tg, electron excitation temperature Texc, and electron density (ne) are studied using various diagnostics such as optical imaging, emission spectra, and thermal diagnostics. From the experiments, it is observed that operating the plasma jet at low pulse modulation frequencies (around 50 Hz) provides enhanced plasma dimensions, higher electron densities and greater optical emission from reactive species (viz., He I, O, OH, N2+, etc.) as compared to the higher modulation frequencies. Besides the low power consumption, the three times less gas temperature of the modulated plasma jet than the continuous wave mode makes it more advantageous for the applications. Moreover, the influence of duty cycle (D) and applied RF power (P) on the plasma jet characteristics are also discussed. It is found that 10- 40% duty cycle operation provides the most favorable attributes. More importantly, the concern of shorter plasma length in RF plasma jets is overcome by operating at 10- 20% duty cycle with increased applied power. This work thoroughly characterizes helium atmospheric pressure RF plasma jet with a wide range of pulse mode operating parameters, which could help select appropriate operating conditions for various industrial and biomedical applications.
