Time-resolved spectroscopy of a homogeneous dielectric barrier discharge for soft ionization driven by square wave high voltage
Time-resolved spectroscopy of a homogeneous dielectric barrier discharge for soft ionization driven by square wave high voltage
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DOI：
10.1007/s00216-015-8969-7
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发表时间：
2015-08
影响因子：
4.3
通讯作者：
V. Horvatić;A. Michels;N. Ahlmann;G. Jestel;D. Veẑa;C. Vadla;J. Franzke
中科院分区：
文献类型：
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作者：
V. Horvatić;A. Michels;N. Ahlmann;G. Jestel;D. Veẑa;C. Vadla;J. Franzke
利用发射光谱技术研究了方波型高压驱动下氦毛细管介质阻挡放电的时空特性。证实了前面用正弦样高压进行的研究的发现，即射流中的等离子体和毛细管中的等离子体构成了两个时间上分离的事件。射流中的等离子体发生在毛细管放电之前，并且仅在施加高压的正半周期内存在。在1.96 ~ 2.31 kV电压幅值变化范围内，毛细管放电相对于射流放电的时间延迟分别在2.4 ~ 8.4 μs之间。结果表明，与正弦波电压相比，施加方波高压能使射流产生更强的He线发射（~6倍），更有利于有效的软电离。利用方波高压对正高压和负高压期间毛细管内的电流（~ 1ma）进行了比较，得到了等离子体射流在大气中耗散的电荷（（4±20%）× 10−11C）的估计。
Helium capillary dielectric barrier discharge driven by the square wave-shaped high voltage was investigated spatially and temporally by means of optical emission spectroscopy. The finding of the previous investigation conducted with the sinusoidal-like high voltage was confirmed, i.e., the plasma in the jet and the plasma in the capillary constitute two temporally separated events. The plasma in the jet occurs prior to the discharge in the capillary and exists only during the positive half period of the applied high voltage. The time delay of the capillary discharge with respect to the discharge in the jet depended on the high voltage, and it was between 2.4 and 8.4 μs for the voltage amplitude change in the range from 1.96 to 2.31 kV, respectively. It was found that, compared to sinusoidal-like voltage, application of the square wave high voltage results with stronger (~6 times) He line emission in the jet, which makes the latter more favorable for efficient soft ionization. The use of the square wave high voltage enabled comparison of the currents (~1 mA) flowing in the capillary during the positive and negative high voltage periods, which yielded the estimation for the charge dissipated in the atmosphere ((4 ± 20 %) × 10−11C) through the plasma jet.