Plasma position information based LIBS (Laser-induced Breakdown Spectroscopy) calibration method

A technology of plasma and position information, which is applied in the field of LIBS spectrum correction of ion position information, can solve the problems of lack of rationality and achieve the effect of suppressing spectral jitter and reducing the complexity of experimental operations

Active Publication Date: 2018-03-20
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

The former requires that the sample to be tested contains an element with a stable content, and the element has a clear characteristic spectral line in the detection wavelength range; the latter assumes that the sum of all spectral intensities in the detection wavelength range is Constant, this assumption is unreasonable when the detection spectrum range is narrow and the matrix element content fluctuates greatly

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  • Plasma position information based LIBS (Laser-induced Breakdown Spectroscopy) calibration method
  • Plasma position information based LIBS (Laser-induced Breakdown Spectroscopy) calibration method
  • Plasma position information based LIBS (Laser-induced Breakdown Spectroscopy) calibration method

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0037] The present invention aims at the problem that the laser focusing depth and the detection position of the spectrometer are different due to the different positions of the samples to be measured, thereby causing spectral jitter, obtains the plasma position information through the plasma image, and establishes a mathematical model to standardize the spectral data obtained under different sample positions processing to achieve correction of spectral data.

[0038] Such as figure 1 As shown, after the method starts, the spectral data and plasma image are obtained by the LIBS experimental platform, the position information is extracted from the plasma image information, and the fitting model is established by combining the intensity of the corresponding characteristic spectral lines and spectral segments, and the obtained fitting The function ...

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Abstract

The invention relates to a plasma position information based LIBS (Laser-induced Breakdown Spectroscopy) stabilization method. The method comprises the specific steps of 1) acquiring LIBS signals under different sample positions and corresponding plasma image signals; 2) extracting plasma position information from plasma image information; 3) creating relation functions of an LIBS section area andvalue relative to the corresponding plasma positions through a fitting method, and creating a relation function between LIBS specific spectral line intensity and the corresponding plasma positions through a fitting method; 4) creating a comprehensive correcting function through the relation functions obtained in step 3); and 5) correcting LIBS with unknown position through the correcting function. A characteristic spectral line corrected by the method is high in stability, and reliable spectral line information is provided for quantitative (qualitative) analysis.

Description

technical field [0001] The invention belongs to the field of spectrum analysis and material composition analysis, and specifically relates to a LIBS spectrum correction method based on plasma position information. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) analysis technology is an atomic emission spectroscopy analysis technology that uses laser-excited plasma as a light source. The qualitative and quantitative analysis of material composition based on LIBS technology has become a hot application in many industrial fields such as metallurgy, energy, food, chemical industry, etc. technology. However, due to the low stability of the obtained spectral signals, LIBS is only used for qualitative analysis and semi-quantitative analysis. Therefore, only by improving the stability of LIBS signal can it meet the needs of quantitative analysis, and thus be applied to real-time on-line in situ detection. [0003] At present, the commonly used spectral ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71G01N2201/127
Inventor 孙兰香张鹏齐立峰于海斌曾鹏
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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