Ms. Zi Zhang Profile

Zi Zhang

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Proceedings Article | 19 November 2021 Paper

Influence of target surface morphology on LIBS spectrum

L. Yang, Z. Zhang, Y. H. Zhang, P. He, F. Ji, R. S. Lu

Proceedings Volume 12059, 1205917 (2021) https://doi.org/10.1117/12.2612111

KEYWORDS: Laser induced breakdown spectroscopy, Surface roughness, Chromium, Plasma, Iron, Target detection, Laser ablation, Surface finishing, Analytical research, Particles

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Laser-induced breakdown spectroscopy (LIBS) is an effective technology to analyze the content of the target elements. The surface morphology of the target will affect the coupling between the laser and the target, which will change the plasma spectrum and lead to inaccurate results. The surface relief and surface roughness are taken as the research parameters of the target surface morphology, the influence of which on LIBS spectrum are researched. The LIBS spectra are acquired on a set of ferroalloy targets, whose included angles θ with horizontal direction changed from -10° to 10°, or surface roughness are different. On the basis of theoretical derivation, we explore the variation trends of line intensity, line integral area, line intensity ratio of different main elements, and line intensity ratio of the same main element with surface morphology parameters. The experimental results have an increasing trend with the increase of θ and a decreasing trend with the decrease of surface roughness. The line intensity ratios are closely related to the change of surface morphology. The line integral area of Cr Ⅰ 429.3438nm has a large variation amplitude and higher correlation coefficient R, which is suitable for characterizing the change of LIBS spectrum with the target surface morphology. The results can provide a valuable reference for reducing the influence of target surface morphology on LIBS detection.

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