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A Method for Improving the Long-term Stability of Quantitative Analysis of Laser-Induced Breakdown Spectroscopy

A laser-induced breakdown and quantitative analysis technology, applied in the field of atomic emission spectrometry, can solve problems such as poor long-term stability, achieve the effects of increasing reliability, solving long-term stability problems, and solving in-situ measurement

Active Publication Date: 2019-01-29
TSINGHUA UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a modeling method for compensating the influence of environmental factors in view of the problem that the current laser-induced breakdown spectroscopy technology is affected by environmental factors resulting in poor long-term stability

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  • A Method for Improving the Long-term Stability of Quantitative Analysis of Laser-Induced Breakdown Spectroscopy

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Embodiment

[0043] 1) For a group of coal calibration samples with known calorific value, the results obtained through traditional off-line analysis of the coal quality characteristics of the calibration samples are shown in Table 1: the number of calibration samples is 30, due to the large number of samples , the standard values ​​of some samples are omitted, and the calorific value is taken as the target characteristic. The laser-induced breakdown spectroscopy system is used to detect each calibration sample separately: the schematic diagram of the structure and principle of the measurement system is shown in figure 1 As shown; the measurement process is as follows: the pulsed laser is used as the excitation light source, the laser emitted from the laser is focused by the focusing lens and then acts on the surface of the calibration sample, and plasma is generated at the focal point, and the plasma is cooled in the atmosphere of protective gas to generate The radiated light signal enter...

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Abstract

The invention provides a method for analyzing the long-term stability of laser-induced breakdown spectroscopy quantitative spectrochemical analysis. According to the method, a large amount of spectroscopic data is acquired from a calibration sample under different environment conditions, the mapping law of the characteristic spectral line strength in a spectrum under different environment conditions can be found out, the characteristic spectral line strength in the spectrum is converted under standard environment temperature, environment humidity and environment pressure conditions, and then an equation between a target characteristic and converted characteristic spectral line strength can be established. When a sample to be measured is measured under a certain environment condition, the measured spectrum can be converted to the standard environment conditions according to the mapping law, a calibration model is substituted to calculate the value of the target characteristic. According to the method, by supplementing the influence to measurement signals caused by the environment condition, the long-term stability of the laser-induced breakdown spectroscopy quantitative spectrochemical analysis can be improved.

Description

technical field [0001] The invention relates to a method for improving the long-term stability of quantitative analysis of laser-induced breakdown spectroscopy, which belongs to the technical field of atomic emission spectroscopy measurement. Background technique [0002] In recent years, laser-induced breakdown spectroscopy (LIBS for short) has become a new laser analysis technique due to its advantages of high sensitivity, no need for sample pretreatment and realization of multi-element measurement. The working principle of this technology is: the laser ablates the sample to generate plasma, and then collects the optical signal emitted by the plasma and inputs it into the spectrometer for analysis. The intensity of the spectral line corresponding to different wavelengths is related to the element content corresponding to the spectral line The height is proportional to. This technology can analyze various substances such as solids, liquids and gases, and has the great adva...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 王哲袁廷璧侯宗余李政
Owner TSINGHUA UNIV
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