Concentration detection method and system for complex matrix sample

Abstract

The invention discloses a concentration detection method and system for a complex matrix sample, and belongs to the technical field of laser plasma emission spectroscopy. According to the method, samples with known element concentrations are used as calibration samples, backgrounds generated by plasma continuous radiation are deducted from collected calibration sample spectrums, the specific intensities of the elements are calculated and analyzed, the specific intensities are used as characteristics of the samples, the calibration samples are divided into a plurality of classes according to the specific intensities, and class numbers are marked as labels of the samples; a classification model is established by combining the original spectrum and the label of the calibration sample; a quantitative model is independently established for each type of calibration set samples; and the spectrum of an unknown sample is collected, the spectrum is substituted into the classification model to determine the category of the sample, and the element concentration of the unknown sample is predicted according to the quantitative model of the category. According to the method, the specific strength of the element needing to be analyzed is taken as the key feature of quantitative analysis, the key feature is easy to obtain, the dimension is low, the calculation amount is small, and the characteristics of the matrix of the sample in the laser-induced breakdown spectroscopy are fully quantified.

Description

technical field [0001] The invention belongs to the technical field of laser plasma emission spectroscopy, and more specifically relates to a method and system for detecting the concentration of complex matrix samples. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS for short) 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. It has many advantages such as fast, in-situ, minimal damage, remote, multi-element simultaneous analysis, and strong environmental adaptability. The principle is to confirm the composition information of the sample by analyzing the high-temperature plasma generated by the laser-induced breakdown sample. In general, the spectral intensity of an element in a plasma is linearly related to its concentration. However, in the process of laser pl...

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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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