Laser induced breakdown spectroscopy-based online solid sampling measurement system and method

Abstract

The invention discloses a laser induced breakdown spectroscopy-based online solid sampling measurement system and method, and belongs to the technical field of atomic emission spectroscopy. According to the system, the four processes such as crushing, compression moulding, detection and withdrawing of a solid sample are connected by a transmission unit and the automatic continuous online measurement of the solid sample is realized by a control unit; the spectral signals collected by a laser induced breakdown spectroscopy detection unit are analyzed through a laser induced breakdown quantitative spectrometric analysis model integrated in a data analysis module, so as to obtain a real-time solid sample characteristic detection result. The system and the method are capable of realizing the laser induced breakdown spectroscopy online analysis of the solid sample and beneficial for pushing the laser induced breakdown spectroscopy technology to develop from laboratory analysis to industrial application.

Description

technical field [0001] The invention relates to an on-line measurement system and method for solid samples based on laser-induced breakdown spectroscopy, and belongs to the technical field of atomic emission spectroscopy measurement. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS for short), also known as laser-induced plasma spectroscopy, is a brand-new material element analysis technology developed in the late 20th century. The working principle of laser-induced breakdown spectroscopy technology is: under the action of strong laser pulses, the material on the surface of the sample is excited to become plasma and decays rapidly. During the decay process, photons of specific frequencies are radiated to generate characteristic spectral lines. The information includes the element type and concentration information of the analysis object. Laser-induced breakdown spectroscopy has the advantages of low operating cost, fast measurement speed, high sensit...

AI Technical Summary

Problems solved by technology

[0003] However, because the laser action point of laser-induced breakdown spectroscopy technology is very small, the amount of ablated material is very small, and the matrix effect is very obvious for inhomogeneous and anisotropic materials; at the same time, the fluctuation of laser energy, plasma temperature, electron The difference in physical parameters such as density leads to low repeatability of laser-induced breakdown spectroscopy measurement; in addition, the influence of environmental parameters and the electronic noise of the internal components of the instrument are likely to interfere with LIBS; therefore, the use of laser-induced breakdown spectroscopy The measurement accuracy of the technology directly measuring the sample cannot be guaranteed, which limits the application of laser-induced breakdown spectroscopy technology in actual production

[0004] If the bulk solid sample is measured directly, because the solid surface is not smooth enough, and the surface cannot completely represent the whole sample, it is necessary to crush the solid sample, grind it into solid powder and mix it uniformly, so that LIBS sampling is more representative; but directly When measuring solid powder, the measurement uncertainty is very large due to powder splashing, which is far from meeting the needs of quantitative analysis; simple pretreatment of the sample, such as pressing the sample powder, can increase the laser-induced breakdown spectroscopy technique Measurement repeatability, reducing the influence of matrix effects

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