Method for measuring elemental concentration through laser-induced breakdown spectroscopy based on spectrophotometry

A laser-induced breakdown and spectral measurement technology, applied in the field of atomic emission spectroscopy, can solve the problems of inability to achieve accuracy, increase laser-induced breakdown spectroscopy technology, inability to completely eliminate measurement uncertainty and various interferences, and achieve The effect of improving measurement accuracy, increasing repeatability, and increasing efficiency

Active Publication Date: 2013-10-30
TSINGHUA UNIV
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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] Simple pretreatment of the sample, such as pressing the sample powder, can increase the repeatability of the laser-induced breakdown spectroscopy measurement, and grinding and mixing the sample uniformly can reduce the influence of the matrix effect, but this still cannot completely eliminate the inaccurate measurement. The degree of certainty and various interferences, direct measurement can not achieve the accuracy required for industrial production, the pretreatment method of the sample needs further research

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  • Method for measuring elemental concentration through laser-induced breakdown spectroscopy based on spectrophotometry
  • Method for measuring elemental concentration through laser-induced breakdown spectroscopy based on spectrophotometry
  • Method for measuring elemental concentration through laser-induced breakdown spectroscopy based on spectrophotometry

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Embodiment

[0030] Taking the measurement of C element in coal by laser-induced breakdown spectroscopy as an example, the method of measuring element concentration by laser-induced breakdown spectroscopy based on spectrometry is described.

[0031] 1) at first use the known ten kinds of standard coal samples of each element mass concentration to analyze, and the mass concentration and volatile matter content of the main elements of each coal sample are as shown in table 1; Utilize the method described in the technical scheme of the present invention, respectively Process the sample.

[0032] Table 1. Composition of standard coal samples

[0033]

[0034]

[0035] 2) Use the laser-induced breakdown spectroscopy system to detect the coal sample: the pulse laser 1 is used as the excitation light source, the laser light emitted from the laser is first divided into two beams of laser light through the beam splitter 2, and the reflection mirror 10 is used to separate the laser beams from ...

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Abstract

The invention discloses a method for measuring elemental concentration through laser-induced breakdown spectroscopy based on spectrophotometry, which belongs to the technical field of atomic emission spectrum measurement. The method is characterized in that a laser light is divided into two beams by an optical spectroscope; and then, the two laser light beams are reflected by a reflector, so that the included angle between the incident direction of the two laser light beams and the normal direction of the surface of a sample is 0-90 degrees. Plasmas generated by laser impaction are mainly expanded toward a direction perpendicular to the surface of the sample, therefore, the shielding effect of the plasmas on the laterally incident laser is weak, so that more laser energy can reach the surface of the sample, and the ablation quality can be improved; and by combining a technology of forming aerosols above the surface of the sample to optimize the experimental conditions for plasma generation, the method ensures that the plasmas can be generated more easily and the electronic density is higher. The method disclosed by the invention increases the repeatability of measurement, thereby facilitating the improvement of the goodness of fit and forecast accuracy of a calibration model.

Description

technical field [0001] The invention relates to a method for measuring element concentration by laser-induced breakdown spectroscopy based on spectroscopic method, 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, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63G01N1/28
CPCG01N21/718
Inventor 王哲李政袁廷璧侯宗余李立志
Owner TSINGHUA UNIV
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