Study on a Room-Temperature Air Plasma for Biomedical Application
Study on a Room-Temperature Air Plasma for Biomedical Application
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DOI：
10.1109/tps.2011.2132152
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发表时间：
2011-04
影响因子：
1.5
通讯作者：
Shuqun Wu;Zhan Wang;Q. Huang;Xinpei Lu;Yuan Pan
中科院分区：
文献类型：
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作者：
Shuqun Wu;Zhan Wang;Q. Huang;Xinpei Lu;Yuan Pan
研究了室温大气压空气等离子体的放电特性。等离子体由自制的直流电源驱动。然而，放电电流出现脉冲。脉冲行为由离子漂移机制决定。详细研究了外加电压和差距距离对脉冲重复频率和电流脉冲峰值的影响。研究发现，施加的电压显着影响，但不是脉冲重复频率。当所施加的电压高于12 kV时，刚好在击穿之前的电极上的电压开始随着所施加的电压的增加而降低。分析表明，在这种情况下，残余电荷对击穿起着重要的作用。另一方面，当施加的电压低于12 kV时，击穿前的电极上的电压对于各种施加的电压保持恒定;这表明在这种情况下，残余电荷在击穿的开始中起次要作用。研究发现，脉冲重复频率取决于离子向电极漂移的时间。进一步的分析表明，在不同的间隙距离下，平均电场保持不变。脉冲重复频率与差距距离成反比，这在实验中被精确地观察到。
The - characteristics of a room-temperature atmospheric pressure air plasma are investigated. The plasma is driven by a homemade direct-current power supply. However, discharge currents appear pulsed. The pulse behavior is determined by the ion drift mechanism. The effects of the applied voltage and the gap distance on pulsed repetition frequency and peak value of the current pulse are studied in detail. It is found that the applied voltage dramatically affects but not the pulse repetition frequency . When the applied voltage is higher than 12 kV, the voltage on the electrode just before breakdown starts to decrease with the increase in the applied voltage. A detail analysis shows that the residual charges play an important role in the initiation of breakdown under this condition. On the other hand, when the applied voltage is lower than 12 kV, the voltage on the electrode just before breakdown keeps constant for various applied voltages; it indicates that the residual charges play a minor role in the initiation of breakdown for this circumstance. It is found that the pulse repetition frequency is determined by the time for the ion drift to the electrode. A further analysis shows that the average electric field keeps constant for various gap distances. The pulse repetition frequency is inversely proportional to the gap distance, which is exactly observed in the experiments.