Method for calibrating spectral line self-absorption effect in laser-induced breakdown spectrometry

A laser-induced breakdown and self-absorption effect technology, applied in thermal excitation analysis, material excitation analysis, material analysis through optical means, etc., can solve the problem of spectral line self-absorption effect in laser-induced breakdown spectroscopy affecting quantitative analysis results, etc. problem, to achieve the effect of direct and simple correction

Inactive Publication Date: 2017-05-31
SHANXI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the self-absorption effect of the spectral line in the laser-induced breakdown spectrum affects the quantitative analysis results, and provides a method for correcting the self-absorption effect of the spectral line in the laser-induced breakdown spectrum

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  • Method for calibrating spectral line self-absorption effect in laser-induced breakdown spectrometry
  • Method for calibrating spectral line self-absorption effect in laser-induced breakdown spectrometry
  • Method for calibrating spectral line self-absorption effect in laser-induced breakdown spectrometry

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Embodiment Construction

[0025] Such as figure 1 As shown, the laser-induced breakdown spectroscopy measurement device used in this embodiment includes a Nd:YAG pulsed laser 1, a light concentrating system 2, a fluorescence collection system 4, a grating spectrometer 5 and an ICCD 6, and the 532nm high-energy narrow pulse emitted by the pulsed laser 1 Focusing on the surface of the sample 3 through the concentrating system 2 to generate plasma, the plasma fluorescence is collected by the fluorescence collection system 4 and then transmitted to the grating spectrometer 5, the grating spectrometer 5 splits the plasma fluorescence according to the wavelength and projects it to the ICCD 6 for photoelectricity Corresponding spectral data are obtained after conversion and analog-to-digital conversion. Among them, the external trigger signal of ICCD 6 is given by pulse laser 1 .

[0026] In this embodiment, an aluminum alloy sample is taken as an example to correct the self-absorption effect of the Al atomi...

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Abstract

The invention belongs to the technical field of laser spectroscopy analysis and detection methods, and concretely relates to a method for calibrating a spectral line self-absorption effect in laser-induced breakdown spectrometry. The method is mainly characterized by acquiring a self-absorption coefficient of a spectral line to be analyzed through plasma electron density and line width of the spectral line to be analyzed measured based on a trace element spectrum line so as to calibrate the spectral line self-absorption effect. The method comprises the concrete steps of (1) selecting a trace element spectrum line under the same measurement condition as an optically thin reference line not affected by the self-absorption effect; (2) calculating corresponding plasma electron density through line width of the selected reference line; (3) calculating the self-absorption coefficient of the spectral line to be analyzed through the electron density and the line width of the spectral line to be analyzed, and evaluating a self-absorption degree; (4) calibrating peak intensity and integral intensity of the spectral line to be analyzed through the self-absorption coefficient. By utilizing the method, the plasma spectral line intensity can be conveniently calibrated, the accuracy of spectral data is improved, and quantitative analysis of material compositions is further carried out accurately.

Description

technical field [0001] The invention belongs to the technical field of laser spectrum analysis and detection methods, in particular to a method for correcting the self-absorption effect of spectral lines in laser-induced breakdown spectra. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) determines the type and content of elements in the sample by measuring the wavelength and intensity of the emission lines in the laser-induced plasma, and realizes qualitative and quantitative analysis of unknown samples. However, when the content of the element to be measured in the sample is high, the emission line of the element is prone to self-absorption, and the self-absorption effect will lead to a decrease in the intensity of the corresponding line and an increase in the width of the line, so that the line intensity and the element The linear relationship between the contents is destroyed, and the accuracy of quantitative analysis is greatly reduced. [0003...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 侯佳佳张雷尹王保肖连团贾锁堂
Owner SHANXI UNIV
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