The Laser-induced Dissociation Spectra And Their Quantitative Research

Laser induced breakdown spectroscopy (LIBS), as an elemental analysis technique, has already aroused people's attention for it's stand-off and rapid analysis without time-consuming sample preparation and multi elements analysis on time. It has good application prospects in the space exploration missions are planed to study the Moon and Mars. The qualitative analysis of LIBS has already tended to be mature and achieved general approval. But the sensitivity and accuracy of quantitative analysis in LIBS can't meet the needs of practical works with the great influence of the matrix effects. Quantitative analysis still is the technology bottleneck of the LIBS. Firstly, a detecting system based on LTBS was designed and built in the laboratory, this article puts forward matrix correction method based on the experiments of quantitative analysis in LIBS. With the analysis of the national standard samples and the results compared with the standard value, this method is effective in reducing the matrix effect on the impact of the measurement results, the limitation of standard samples has been relaxed, the scopes of application has been expanded compared with traditional quantitative method.. The feasibility of the method which applied to quantitative analysis of LIBS has been tested by experiments as well. Secondly, according to the needs of quantitative experiments, a calibration method for the grating response of the echelle spectrograph was presented. It can give the real distributed relationship of the spectra-line intensity in different wavelength with calibration and offer the realistic basis for spectrum quantitative analysis.