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A Time-Resolved Laser-Induced Breakdown Spectroscopy Quantitative Method

A laser-induced breakdown, time-resolved technique used in the quantitative field of laser-induced breakdown spectroscopy

Active Publication Date: 2021-09-10
CHINESE ACAD OF AGRI MECHANIZATION SCI
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a time-resolved laser-induced breakdown spectrum quantitative method based on multidimensional partial least squares to improve the laser-induced breakdown spectrum quantitative analysis problem in the prior art. Quantitative Analysis Precision

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  • A Time-Resolved Laser-Induced Breakdown Spectroscopy Quantitative Method

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing, working principle of the present invention is specifically described:

[0050] The multidimensional partial least square method (N-way partial least square, NPLS) is a modeling method developed on the basis of the traditional partial least square method. The traditional partial least squares method is used to process two-dimensional matrix data, such as a series of laser-induced breakdown spectra integrated within a specific time period of a sample, and construct a regression relationship between the two-dimensional spectral matrix and the target component. The multidimensional partial least squares method is used to process three-dimensional matrix data, such as the dynamic time-resolved laser-induced breakdown spectrum collected in the process of plasma time evolution, to construct the regression relationship between the wavelength dimension information of the laser-induced breakdown spectrum and the target component, and...

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Abstract

A time-resolved laser-induced breakdown spectrum quantitative method, comprising acquiring the spectrum and components of the measured object, collecting a plurality of time-resolved laser-induced breakdown spectra of the measured object, and obtaining the target component content of the corresponding measured object; A calibration set and a verification set, arranging a plurality of the measured substances according to the concentration gradient of the target components, dividing the calibration set and the verification set by taking 1 every m, and recording the spectral matrices of the calibration set and the verification set respectively and target component matrix; multidimensional partial least squares analysis, further comprising spectral matrix and target component matrix decomposition of calibration set; linear regression is carried out to described spectral score matrix and component score matrix, and described spectral score matrix is ​​to described component score The explanatory power of the matrix is ​​the largest; the verification set prediction predicts the target component of the verification set through the spectral score matrix of the verification set, the regression coefficient matrix of the calibration set and the component loading matrix of the calibration set.

Description

technical field [0001] The invention relates to a quantitative method of laser-induced breakdown spectrum, in particular to a time-resolved quantitative method of laser-induced breakdown spectrum based on multidimensional partial least squares. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique, which has been widely used in steel manufacturing, space development, environmental protection and other fields in recent years because of its multi-component simultaneous analysis and high sensitivity. . Laser-induced breakdown spectroscopy technology uses a pulsed laser to excite the surface of an object to generate a transient plasma with the characteristics of the object's elements, and a spectrometer is used to collect the spectral wavelength and intensity signals emitted within a specific time. Based on the different energy released by the transition of different elements during the de-excitation process of ex...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71G06F17/16G06F17/18
CPCG01N21/718G06F17/16G06F17/18
Inventor 吕程序张俊宁王辉苑严伟牛康白辰睿
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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