Laser-induced breakdown spectral screening method

Abstract

The invention relates to a laser-induced breakdown spectral screening method, which is used for screening laser-induced breakdown spectrums based on a Euclidean distance, so as to reject acquired unstable spectrums of measured objects and screen out representative spectrums of the measured objects. The laser-induced breakdown spectral screening method comprises the steps of: acquiring the laser-induced breakdown spectrums of the measured objects, continuously acquiring a plurality of spectrums of each measured object and recording a spectrum matrix; setting a distance screening threshold valueT%, so as to reserve spectrums with Euclidean distances less than T% in the spectrum matrix; screening the spectrums according to the spectral Euclidean distances, deleting two spectrums with the maximum Euclidean distances in the spectral matrix according to a Euclidean distance matrix of the spectral matrix, and updating the spectral matrix; circularly screening the spectrums until the number of spectrums in the updated spectrum matrix reaches the distance screening threshold value; and solving an average spectrum of the updated spectrum matrix, and taking the average spectrum as a representative spectrum of the measured objects. The laser-induced breakdown spectral screening method effectively improves the stability of the laser-induced breakdown spectrums of the measured objects and the precision of the model.

Description

technical field [0001] The invention relates to a screening method of laser-induced breakdown spectrum, in particular to a screening method of laser-induced breakdown spectrum based on Euclidean distance. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique that uses pulsed lasers to excite the surface of an object to generate a transient plasma, and then emits spectral lines with the characteristics of the sample elements, which are collected by a spectrometer Its wavelength and intensity signal can be used for qualitative and quantitative analysis. Because of its advantages such as less sample loss, long-distance in-situ measurement, simultaneous analysis of all components, high sensitivity, and low detection limit, LIBS is widely used in element measurement research of ores, metals, and agricultural products. [0003] Ideally, the quantitative detection of laser-induced breakdown spectroscopy is based on t...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a screening method of laser-induced breakdown spectrum based on Euclidean distance for the screening of the representative laser-induced breakdown spectrum of the measured object in the prior art, so as to improve the laser-induced breakdown spectrum of the measured object. The stability of the spectrum and the accuracy of the model

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