Laser-induced breakdown spectroscopy standard-sample-free quantification method and system

Abstract

The invention provides a laser-induced breakdown spectroscopy standard-sample-free quantification method and system. According to the method, the self-absorption coefficients of a plurality of self-absorption spectral lines of major elements in a to-be-detected sample are calculated; the columnar density of low-energy-level particles corresponding to each spectral line is calculated through the self-absorption coefficients; the ratio of the plasma temperature to the content of the major elements is accurately calculated; the ratio of the content of one major element to the content of all trace elements is calculated by selecting a self-absorption-free spectral line as a standard reference line for the major element and all the trace elements; and the ratios of the contents of all the elements in the to-be-detected sample are calculated. According to the method disclosed by the invention, the content ratio of the plasma temperature to the major elements can be accurately calculated by utilizing the broadening of the spectral lines influenced by the self-absorption effect in the LIBS spectrum, and the calculation of the required spectral line broadening is not influenced by the optical efficiency of the system.

Description

technical field [0001] The invention belongs to the field of laser spectrum analysis, and more specifically relates to a standard sample-free quantification method and system of laser-induced breakdown spectroscopy. Background technique [0002] Laser-Induced Breakdown Spectroscopy (LIBS) is a standard-free quantitative method, directly based on the plasma emission theory, using spectral line parameters such as transition probability, energy level, degeneracy of characteristic spectral lines, plasma temperature and The electron number density directly calculates the element content of the substance to be analyzed. It has the advantages of not needing a standard sample to establish a calibration curve and multi-element simultaneous analysis. It can be widely used in the fields of metallurgical industry, energy exploration, archaeology, environmental protection, biomedicine, and space exploration. . The traditional LIBS standard-free quantitative method is based on the Boltzm...

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Problems solved by technology

[0005] In view of the defects of the prior art, the object of the present invention is to provide a laser-induced breakdown spectroscopy standard sample-free quantification method and system, aiming at solving the problem that certain elements in the sample to be tested are all The standard-free quantification method under the condition that the spectral lines are all affected by self-absorption has not been fully studied

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