Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum-magnesium alloy
Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum-magnesium alloy
复制标题
铝镁合金激光诱导烧蚀等离子体物质分布的测量与分析
DOI：
10.1088/2058-6272/ac401a
复制
发表时间：
2021
影响因子：
1.7
通讯作者：
Suotang Jia
中科院分区：
文献类型：
--
作者：
Junxiao Wang;Shuqing Wang;Lei Zhang;Maogen Su;Duixiong Sun;Qi Min;Weiguang Ma;Wangbao Yin;Suotang Jia
我们提出了一种基于激光烧蚀热模型和二维轴对称多物种流体动力学模型的理论时空成像方法。利用强度公式可以计算谱线的积分强度并绘制相应的强度分布图像。通过进一步的图像处理，如归一化、最小强度的确定、组合和滤色等，可以获得等离子体中相对清晰的物种分布图像。利用上述方法，我们模拟了1 atm氩气下不同激光能量对Al-Mg合金的等离子体烧蚀，得到了Mg I、Mg II、Al I、Al II和Ar I物种的理论时空分布，与差分成像的实验结果几乎一致。与实验衰减时间常数相比，低激光能量下的一致性更高，表明我们的理论模型更适合以激光支持燃烧波为主的等离子体。
We proposed a theoretical spatio-temporal imaging method, which was based on the thermal model of laser ablation and the two-dimensional axisymmetric multi-species hydrodynamics model. By using the intensity formula, the integral intensity of spectral lines could be calculated and the corresponding images of intensity distribution could be drawn. Through further image processing such as normalization, determination of minimum intensity, combination and color filtering, a relatively clear species distribution image in the plasma could be obtained. Using the above method, we simulated the plasma ablated from Al–Mg alloy by different laser energies under 1 atm argon, and obtained the theoretical spatio-temporal distributions of Mg I, Mg II, Al I, Al II and Ar I species, which are almost consistent with the experimental results by differential imaging. Compared with the experimental decay time constants, the consistency is higher at low laser energy, indicating that our theoretical model is more suitable for the plasma dominated by laser-supported combustion wave.