Laser induced plasma parameter characterization method based on self-absorption quantification of spectral line

Abstract

The invention discloses a laser induced plasma parameter characterization method based on self-absorption quantification of a spectral line. The self-absorption degree of the spectral line is quantified by measuring the line width of the element spectral line so as to obtain plasma parameters such as electron temperature, element content ratio and particle absolute number density. Because the calculation process of the method has no need of using spectral line intensity, adverse influences caused by the self-absorption effect during traditional calculation of the plasma parameters based on thespectral line intensity are avoided, and the spectral efficiency of a detector does not need to be corrected so as to effectively prolong the calibration period of LIBS (Laser-Induced Breakdown Spectroscopy) detection equipment and directly and accurately characterize the plasma parameters.

Description

Technical field [0001] The invention belongs to the technical field of laser spectrum analysis and detection methods, and specifically relates to a method for characterizing laser-induced plasma parameters based on spectral line self-absorption quantification. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) technology obtains the elemental composition and relative abundance information of the sample by analyzing the plasma radiation generated by high-energy pulsed laser bombardment of the sample. It has a wide range of applications in industrial analysis, environmental monitoring, biomedicine and other fields. However, the self-absorption effect existing in the quantitative analysis of LIBS will not only reduce the intensity of the element emission line and increase the line width, but also have a nonlinear effect on the quantitative analysis results and reduce the detection accuracy. Therefore, how to eliminate the influence of self-absorption is the ke...

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Problems solved by technology

However, the above existing methods rely on ideal assumptions or approximate models to correct the intensity of self-absorption lines, or add devices to reduce the self-absorption effect of specific lines, while the complexity of laser-matter interaction and the instantaneous nature of plasma evolution Undoubtedly greatly reduces the practicability of these assumptions or models for quantitative analysis of LIBS

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