Laser-induced shock process in under-liquid regime studied by time-resolved photoelasticity imaging technique
Laser-induced shock process in under-liquid regime studied by time-resolved photoelasticity imaging technique
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DOI：
10.1063/1.4798532
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发表时间：
2013-03
影响因子：
4
通讯作者：
T. Nguyen;R. Tanabe;Yoshiro Ito
中科院分区：
文献类型：
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作者：
T. Nguyen;R. Tanabe;Yoshiro Ito
直观地演示了液体覆盖层的等离子体约束效应对激光诱导冲击过程中应力的增强作用，并研究了液体覆盖层对激光诱导冲击过程中应力增强的影响。采用时间分辨光弹性成像技术，在明场模式下，同时观察到固相中的应力波和液相中的冲击波、等离子体和空化泡。从光弹性图像，强度的激光诱导的应力波（LSW）内的固体进行了半定量评估。我们证明了液层越薄，LSW越弱。为了实现与大量液体相同的效果，液体膜需要比阈值更厚。
Stress enhancement in laser-induced shock process by plasma-confining effect of liquid overlay was demonstrated visually and its dependence on liquid layer thickness was studied. Time-resolved photoelasticity imaging technique in bright-field mode was used to observe the stress wave in solid phase and the shock wave, plasma, and cavitation bubble in the liquid phase simultaneously. From the photoelastic images, intensity of the laser-induced stress wave (LSW) inside a solid was evaluated semi-quantitatively. We prove that LSW is weaker with thinner liquid layer. To achieve the same effect with bulk liquid, the liquid film needs to be thicker than a threshold value.