Laser-induced breakdown spectroscopy quick detecting method based on multi-spectral inner calibration

Abstract

The invention discloses a laser-induced breakdown spectroscopy quick detecting method based on multi-spectral inner calibration. The method comprises the steps: choosing and calculating a ratio (serving as longitudinal coordinates) of the intensity sum of a plurality of analysis spectral lines to the intensity sum of a plurality of inner calibration spectral lines and analysis element concentration values (serving as horizontal coordinates) to establish a calibration curve and obtain a high correlation coefficient calibration curve to be applied to quantitatively analyzing element ingredients.The method can prevent analysis errors caused by irregular forms of samples, so that LIBS detection accuracy is improved.

Description

technical field [0001] The invention belongs to the field of material detection, and specifically refers to a laser-induced breakdown spectrum rapid detection method, in particular to a laser-induced breakdown spectrum rapid detection method based on multispectral internal calibration. Background technique [0002] Laser Induced Breakdown Spectroscopy (Laser Induced Breakdown Spectroscopy), referred to as LIBS, was proposed and realized in 1962 by the David Cremers research group of the Los Alamos National Laboratory in the United States. Since Brech, a member of the group, first proposed the spectrochemical method of using a ruby ​​maser to induce plasma in 1962, laser-induced breakdown spectroscopy has been widely used in various fields such as gases, liquids and solids. [0003] Laser-induced breakdown spectroscopy technology is based on the one-to-one relationship between the wavelengths of atomic spectra and ion spectra and specific elements, and the spectral signal int...

AI Technical Summary

Problems solved by technology

The irregular sample surface will affect the laser energy density in the detection process of laser-induced breakdown spectroscopy (LIBS), which in turn will affect the ablation amount of the sample and the plasma spectral intensity, which will bring large errors to the experimental results.

In order to improve the detection accuracy, the sample must be pretreated, but this violates the original intention of in situ analysis and online analysis

[0007] Therefore, under the premise that the samples cannot be uniformly pretreated in the field environment, how to ensure the detection accuracy and repeatability of LIBS is a major problem to be solved in the face of various forms of samples to be tested.

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