1. Accuracy improvement of quantitative analysis in spatially resolved fiber-optic laser-induced breakdown spectroscopy
- Author
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Yun Tang, Yongfeng Lu, Yanwu Chu, Lu Wanjie, Zhihao Zhu, Shixiang Ma, Lianbo Guo, Xiaoyan Zeng, Qingdong Zeng, and Yuyang Ma
- Subjects
Materials science ,Alloy ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,Spectral line ,law.invention ,Optics ,law ,Aluminium ,Fiber laser ,Spectroscopy ,Image resolution ,Optical fiber cable ,business.industry ,010401 analytical chemistry ,Plasma ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,chemistry ,engineering ,0210 nano-technology ,business - Abstract
Fiber-optic laser-induced breakdown spectroscopy (FO-LIBS) has been employed in many applications because of the flexibility of optical fiber cable. However, the inhomogeneous elemental distribution of plasmas can cause a self-absorption effect and, hence, significantly hinder the determination of FO-LIBS. Here, to solve this flaw, we took iron (Fe), magnesium (Mg), and zinc (Zn) elements in aluminum alloy as examples to investigate the self-absorption reduction and accuracy improvement using spatially resolved FO-LIBS. Spatially resolved FO-LIBS means the spectra were collected at different positions along the direction parallel to the surface of the sample rather than at the center of the plasma. With this method, the self-absorption effect could be improved by selecting different acquisition positions along the X-axis. The root mean square error of cross-validations (RMSECV) for Fe, Mg, and Zn were reduced from 0.388, 0.348, and 0.097 wt. % to 0.172, 0.224, and 0.024 wt. %, respectively. Generally, spatial resolution is an effective method of self-absorption reduction and accuracy improvement in FO-LIBS.
- Published
- 2018