Non-calibration method for quantitative analysis of laser-induced breakdown spectroscopy elements

A laser-induced breakdown and quantitative analysis technology, applied in the field of spectroscopy, can solve problems such as low analysis accuracy, complicated calculation steps, and difficult to obtain parameters, and achieve high analysis accuracy, simple calculation steps, and overcome matrix effects.

Active Publication Date: 2021-05-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the analysis accuracy of CF-LIBS is low, the calculation steps are complicated, the parameters in the electron density and temperature correction are difficult to obtain, and it is impossible to accurately and accurately quantitatively analyze the samples of unknown elements.

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  • Non-calibration method for quantitative analysis of laser-induced breakdown spectroscopy elements
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  • Non-calibration method for quantitative analysis of laser-induced breakdown spectroscopy elements

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Embodiment Construction

[0040] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0041] The pulsed laser beam emitted by the laser is focused on the surface of the sample to generate plasma, which can be considered to be in a state of local thermodynamic equilibrium, and meets the assumptions of chemical ablation and optical thinning. Therefore, the distribution law of atoms and ions in the plasma satisfies the Maxwell velocity distribution rate. Due to the disorder of the motion direction of atoms and ions in the plasma, the characteristic light emitted in the plasma will appear Doppler effect.

[0042] Such as figure 1 As shown, the present invention is illustrated by taking the measurement of the element content in an aluminum alloy sample as an example, including the following steps:

[0043] S1. Analyze according to th...

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Abstract

The invention discloses a non-calibration method for quantitative analysis of laser-induced breakdown spectroscopy elements, which is applied to the field of spectral element analysis and aims to solve the technical problems that in the prior art, a to-be-detected sample needs to have certain priori knowledge, and the sample to be detected with unknown elements cannot be quickly and accurately quantitatively analyzed. The method is based on a Maxwell rate distribution law and a Doppler effect; a quantitative relation between the intensity of a spectrum peak and the like and physical quantities such as characteristic light wavelength, element content, instrument parameters, atomic mass, light velocity, upper and lower energy levels, a Boltzmann constant and a Planck constant is given; meanwhile, quantitative analysis of elements of the to-be-detected sample is realized according to a normalization method and the like; and the method provided by the invention can overcome the matrix effect to a great extent, and is suitable for solid, liquid and gas samples and various types of LIBS (Laser-induced Breakdown Spectroscopy) equipment.

Description

technical field [0001] The invention belongs to the field of spectroscopy, in particular to a laser spectrum element analysis technology. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS for short) is a qualitative and quantitative analysis technique based on atomic excitation and emission spectroscopy. LIBS has the advantages of fast detection speed, no limitation of environmental factors, and no need for sample pretreatment. However, due to the influence of analysis and calculation methods and other factors, the accuracy of quantitative elemental analysis of LIBS still needs to be improved. [0003] At present, quantitative analysis methods applied to LIBS are divided into three categories. The first type is the calibration method, in which a series of standard samples of different concentrations are prepared for a certain element in the sample, and the calibration curve of the element is obtained according to the intensity of the spectral peak of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71
Inventor 张红张殿鑫王崧宁赵勇
Owner SOUTHWEST JIAOTONG UNIV
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