Concentration detection method and system for complex matrix samples

Abstract

The invention discloses a concentration detection method and system for a complex matrix sample, belonging to the technical field of laser plasma emission spectroscopy. This method uses the sample with known element concentration as the calibration sample, deducts the background caused by continuous plasma radiation from the collected calibration sample spectrum, and calculates the specific intensity of the analyzed elements. The specific intensity is regarded as the characteristic of the sample, according to the specific intensity. The calibration samples are divided into several categories, and the category number is marked as the label of the sample; the classification model is established by combining the original spectrum of the calibration sample and its label; the quantitative model is established independently for each type of calibration set sample; the spectrum of the unknown sample is collected, and the spectrum Bring it into the classification model to determine the category of the sample, and then predict the element concentration of the unknown sample according to the quantitative model of the category. The invention regards the element specific intensity to be analyzed as the key feature of quantitative analysis, which is easy to obtain, has low dimension, and small computation amount, and fully quantifies the characteristics of the matrix of the sample in the laser-induced breakdown spectrum.

Description

technical field [0001] The invention belongs to the technical field of laser plasma emission spectroscopy, and more particularly, relates to a concentration detection method and system for complex matrix samples. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) technology is a typical plasma emission spectroscopy technology, also known as laser probe technology. Laser probe technology is widely used in geological exploration, biomedicine, environmental monitoring, marine science and other fields. The principle is to confirm the composition information of the sample by analyzing the high-temperature plasma generated by the laser-induced breakdown of the sample. In general, the spectral intensity of an element in a plasma is linearly related to its concentration. However, in the process of laser plasma formation, due to the different physical and chemical properties caused by the differences in the types and contents of elements contained in the samp...

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Problems solved by technology

However, the instrument uses two lasers and multiple mirrors, which increases the cost of the equipment, and the density of the aerosol is much smaller than that of solids and liquids, resulting in a great reduction in the total number of particles forming the plasma, thus weakening the spectral signal, which is not conducive to low-concentration elements detection

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