研究目的
Investigating the interaction dynamics of two counterpropagating laser induced plasmas and shockwaves in ambient air, focusing on the effects of separation distance and energy ratio between the plasma sources.
研究成果
The interaction of two counterpropagating plasma plumes and shockwaves in air leads to the formation of a stagnation layer and a plasma jetlet, whose characteristics depend on the separation distance and energy ratio of the sources. The propagation of the shock front from a high energy source through a low energy plasma predominantly leads to jetlet formation, providing insights into energy exchange mechanisms during plasma interactions.
研究不足
The study is limited to low density and low temperature plasma sources in ambient air. The observations are constrained by the spatial and temporal resolution of the imaging techniques used.
1：Experimental Design and Method Selection:
The study utilized 2D emission and shadowgraphic imaging techniques to observe the interaction dynamics of plasmas and shockwaves generated by a 7 ns laser induced breakdown of air. The experiment varied the separation distance between two plasma sources and their energy ratios to study the formation of a stagnation layer and plasma jetlet.
2：Sample Selection and Data Sources:
The plasma sources were created by focusing two counterpropagating laser pulses into ambient air, with the separation distance and energy ratios systematically varied.
3：List of Experimental Equipment and Materials:
The setup included a Nd:YAG laser for plasma generation, a He–Ne laser for shadowgraphy, and ICCD cameras for imaging. Lenses and translation stages were used to control the laser focus and separation distance.
4：Experimental Procedures and Operational Workflow:
Two laser pulses were focused into air to create plasma sources. The interaction dynamics were captured using shadowgraphy and 2D emission imaging at various time delays.
5：Data Analysis Methods:
The evolution of plasma and shockwaves was analyzed from the captured images, focusing on the formation of stagnation layers and jetlets.
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