激光诱导击穿光谱（LIBS）是一种检测分析技术，在冶金工业、农业生产、环境监测、食品安全、生物医药和太空探测等方面具有广阔的应用前景。然而，由于受到等离子体自吸收效应、基体效应和光谱波动的影响，LIBS技术的分析灵敏度、精准度和稳定性较差，限制了该技术的进一步推广及应用，本项目采用空间约束与气氛保护有机融合，改善受控等离子体的均匀性，调控等离子体温度和电子数密度，获得光学薄等离子体，从而减小自吸收效应。同时，深入研究受控等离子体行为与光谱自吸收效应之间的相关性，在此基础上建立受控等离子体自吸收行为的数理模型。项目成果有望实现在提高灵敏度的同时克服自吸收效应引起的干扰，保证LIBS定量分析的精准度，为LIBS技术的工业化应用开辟一条新道路。

Laser-induced breakdown spectroscopy (LIBS) is an elemental detection and analysis technology, which has broad application prospects in metallurgical industry, agricultural production, environmental monitoring, food safety, biomedicine and space exploration. Due to the influence of plasma self-absorption effect, matrix effect and spectral fluctuation, the analysis sensitivity, accuracy and stability of LIBS technology are poor, which limits the further development and application of the technology. In this project, spatial confinement and ambient gas were combined to improve the uniformity of controlled plasma, plasma temperature, and electron number density, and obtain optically thin plasma, thus reducing the self-absorption effect. The correlation between the behavior of controlled plasma and the spectral self-absorption effect is studied. On the basis of this, the mathematical model of self-absorption behavior of controlled plasma is established. It is expected that the project will improve the sensitivity and overcome the interference caused by the self-absorption effect, and ensure the accuracy of quantitative analysis of LIBS. It also presents a new approach to the industrial application of LIBS technology.