SYSTEM AND METHOD FOR THE QUANTITATIVE ANALYSIS OF THE ELEMENTARY COMPOSITION OF MATTER BY LASER-INDUCED PLASMA SPECTROSCOPY (LIBS)

摘要

A system and method for measuring elemental concentrations of a material from a sample containing several elements by LIES analysis is provided. The material is heated to generate plasma and its chemical composition is determined from spectral analysis of its radiation. The spectral lines of interest are identified among those emitted by constituents of each element composing sample, and their intensities are measured. The chemical composition of the plasma is calculated. The absorption coefficient according to wavelength is calculated for the spectral zones of the lines of interest. The spectral radiance of the plasma is calculated for the same spectral zones and then a comparison of the intensity and shape of the spectrum thus calculated with those of the spectrum measured is performed. These calculations and this comparison are repeated iteratively in order to adjust the temperature, electron density, relative values of the elemental concentrations and width of the plasma.