Method for improving qualitative detection capability of laser-induced breakdown spectroscopy technology based on baseline correction and spectrum peak recognition

Abstract

The invention relates to the technical field of substance component analysis of atomic emission spectroscopy, in particular to a method for improving qualitative detection capability of a laser-induced breakdown spectroscopy technology based on baseline correction and spectral peak recognition, and the method comprises the following steps: improving a segmented Hermite cubic interpolation baseline correction algorithm to adaptively realize LIBS baseline correction; and on the basis of baseline correction, correcting the distorted LIBS characteristic peak by using a spectrum peak identification algorithm of spectrum peak parting fitting, and accurately identifying the peak position of the characteristic peak. According to the method provided by the invention, LIBS spectrum baseline drift caused by factors such as a system and an environment in the spectrum data can be effectively removed; the difficulty that the LIBS spectrum peak waveform form is difficult to recognize in a traditional spectrum peak recognition method is solved, correction fitting in different modes is carried out according to the spectrum peak form, and the spectrum peak recognition accuracy is improved; the method can automatically complete the analysis and correction, is more suitable for information extraction of a large number of experimental samples, and provides a valuable reference for qualitative and quantitative online detection of LIBS.

Description

Technical field [0001] The present invention relates to a substance component analysis technique of atomic emission spectroscopy, and in particular, a method based on baseline correction and peak recognition lifting laser induced breakdown spectroscopy technique. Background technique [0002] Laser-Induced Breakdown Spectroscopy Technology is a commonly used material component analysis method, laser, focusing on the surface of the sample, laser plasma generated by the measured sample interaction by collecting The system, coupled to the fiber and transmitted to the spectrometer, the spectrometer displays the Libs spectral signal diagram, and the data is sent to the computer. [0003] In recent years, under the fierce competition in the production and manufacturing, in order to improve the level of industrial informationization and automation, the urgent needs of the industrial production process and product quality assurance, driving the testing technology to high level, high stan...

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Problems solved by technology

[0004] In the early stage of plasma excitation, the spectrum is affected by bremsstrahlung and the detection environment to produce continuous background signals, which makes the baseline drift of LIBS spectrum and affects the judgment of spectral intensity

In addition, the LIBS spectral line has a very narrow Lorentzian broadening, and the spectral data is easily affected by noise, spectral line overlap and continuous background, resulting in spectral peak drift and peak shape distortion, affecting the accuracy and quality of the detection results. stability, which limits its practical application

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