Plasma imaging for physical variations in laser-induced aerosol plasma with particle size increase,Journal of Analytical Atomic Spectrometry

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Plasma imaging for physical variations in laser-induced aerosol plasma with particle size increase
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-09-18 , DOI: 10.1039/d0ja00297f
Muhammad Sher Afgan _{1,

2,

3,

4,

5} , Sahar Sheta _{1,

2,

3,

4,

5} , Yuzhou Song _{1,

2,

3,

4,

5} , Weilun Gu _{1,

2,

3,

4,

5} , Zhe Wang _{1,

2,

3,

4,

5}

Affiliation

Analytical signal repeatability of the techniques based on laser induced photoionization of aerosols is largely affected by the physical variations in laser–aerosol interaction process. Laser-induced breakdown spectroscopy is especially influenced by these variations since emission from laser–aerosol interaction is taken as a source of analytical signal. In this paper, quantified plasma imaging is presented for physical changes in laser induced plasma of aerosols with particle size. Event-to-event individuality increased with particle size as shown by decreased statistical correlation of plasma images. At optimum delay, average correlation coefficient decreased from 0.931 to 0.856 for particle size increase from 0.2 μm to 1.0 μm. Comparison with pure N₂ plasma results showed that repeatability seriously deteriorates for a multi-phase aerosol ablation compared to uni-phase gaseous photoionization. Physical measurements of plasma dimensions showed a shift of ablation region towards laser beam with particle size increase. Average plasma length increased from 4.25 mm to 4.82 mm for the same size increase. These results reveal that increased individuality, plasma length and shift in ablation region are the contributing factors behind the higher uncertainty of aerosol plasma emission with particle size.

中文翻译：

等离子体成像可随着粒径的增加而使激光诱导的气溶胶等离子体发生物理变化

基于激光诱导的气溶胶光电离技术的分析信号的可重复性在很大程度上受到激光-气溶胶相互作用过程中物理变化的影响。激光诱发的击穿光谱尤其受这些变化的影响，因为激光与气溶胶相互作用的发射被视为分析信号的来源。在本文中，提出了定量等离子体成像，以了解激光诱导的气溶胶血浆中粒径的物理变化。事件间的个体性随粒径的增加而增加，如血浆图像的统计相关性降低所显示。在最佳延迟下，随着粒径从0.2μm增加到1.0μm，平均相关系数从0.931下降到0.856。与纯N _2的比较等离子体结果表明，与单相气态光电离相比，多相气溶胶烧蚀的可重复性严重降低。等离子体尺寸的物理测量结果表明，随着粒径的增加，烧蚀区域向激光束方向移动。对于相同的尺寸增加，平均血浆长度从4.25毫米增加到4.82毫米。这些结果表明，增加的个体性，血浆长度和消融区域的偏移是气溶胶血浆排放随粒径的不确定性增加的原因。

更新日期：2020-11-03

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