Element spectral line reverse-extracting method of laser induced breakdown spectrum

Abstract

The invention relates to an element spectral line reverse-extracting method of a laser induced breakdown spectrum, which aims at the bottleneck problem of the laser induced breakdown spectrum as a highest potential element analysis technology so as to improve the track detection limit of a tested element. In the method, background information that changes slowly is extracted, the simultaneous lossless extraction of a plurality of element spectral lines can be effectively achieved, the integrity of information characteristics of all element spectral lines is ensured, the signal noise ratio of a measured spectral signal and the trace detection limit of the tested element are greatly improved, and the improved multiplying ratio of the signal noise ratio of the element spectral line is directly proportional to the removal amount of the background information. The method does not need standard emission spectral lines and linear structures of various extracted elements and the standard background reference spectrums of different measured substrates, achieves the simultaneous extraction of a plurality of element spectral lines within the broad spectrum range and is suitable for the separation and the extraction of element spectral lines of various analyzed matters of various states including gas state, solid state and liquid state that take the laser induced breakdown spectrum technology as a means.

Description

technical field [0001] The invention relates to laser spectrum analysis technology, in particular to a method for reverse extraction of laser-induced breakdown spectrum element spectral lines. Background technique [0002] With the development of laser technology, laser-induced breakdown spectroscopy (LIBS) has shown excellent analytical capabilities. Its analysis is simple and fast, without sample pretreatment, and avoids secondary pollution. In the past 20 years, the application of laser-induced breakdown spectroscopy has become the focus of research. From the initial qualitative analysis, it has gradually shifted to quantitative measurement and remote sensing detection. Combining femtosecond pulse-induced laser filament and fiber optic technology, it has been applied to the analysis of nuclear reactor components. and surface composition measurements on Mars. At the same time, laser-induced breakdown spectroscopy is also used in the research of environmental pollutants, i...

AI Technical Summary

Problems solved by technology

Compared with the weaker laser plasma spectral signal, the strength of the background spectrum determines the trace detection limit of the element. How to remove the background and improve the signal-to-noise ratio of spectral detection becomes the key to solving the problem. The conventional analysis method is to choose the appropriate extension However, the optimal detection time and control gate width for different elements are not the same. In order to obtain simultaneous measurement of multiple element spectral lines, a compromise method is usually used to simultaneously measure multiple At this time, an effective spectral extraction method is more important, because the laser plasma spectral line width of metal elements is usually only a few tenths of a nanometer, and is subject to various broadening (natural broadening, Doppler broadening, Lorentz broadening, etc.) mechanism, it is difficult for conventional spectral analysis methods to fully extract spectral line information and remove background information from the measured spectrum

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