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Extending the volume of atmospheric pressure plasma jets through the use of additional helium gas streams

机译：通过使用额外的氦气流延伸大气压等离子体喷气机的体积

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Atmospheric pressure plasma jets are a promising tool for a variety of applications.However,the small size of atmospheric pressure plasma jets limits their use to small scale processes and materials treatment.To address this issue,this work describes how to increase the plasma volume without additional power supplies or circuitry.Instead,additional noble gas streams are positioned orthogonal to the jet's direction of propagation which generates new plasma regions along these streams.This approach increases the plasma volume,which also increase the effective area available to interact with surfaces.The resulting augmented plasma is characterized with electrical,imaging,and time-integrated optical emission spectroscopy techniques.With these additional gas streams,the power required to drive the plasma jet increases sublinearly with the plasma volume,making this an attractive method to generate large area plasmas efficiently.The emission intensity of the He-air plasma lines along the plasma jet were compared to those in the added noble gas streams and were found to be similar in magnitude and follow similar trends as the main plasma jet.There does not appear to be a limit on the number of noble gas streams that can be added downstream of the plasma jet and thus volume expansion.
机译：大气压等离子体射流是一种很有前途的工具，可用于多种应用。然而，大气压等离子体射流的小尺寸限制了其在小规模工艺和材料处理中的应用。为了解决这个问题，这项工作描述了如何在不增加电源或电路的情况下增加等离子体体积。相反，额外的惰性气体流被放置在与射流传播方向正交的位置，从而沿着这些气流产生新的等离子体区域。这种方法增加了等离子体体积，也增加了与表面相互作用的有效面积。由此产生的增强等离子体具有电学、成像和时间积分光学发射光谱技术的特征。有了这些额外的气流，驱动等离子体射流所需的功率与等离子体体积呈次线性增加，这使得这是一种高效产生大面积等离子体的有吸引力的方法。将沿等离子体射流的氦-空气等离子体线的发射强度与添加的惰性气体流中的发射强度进行了比较，发现其强度与主等离子体射流类似，并遵循类似的趋势。对于可添加到等离子体射流下游的惰性气体流的数量，以及由此产生的体积膨胀，似乎没有限制。

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