Design And Research Of The Detector Based On LIBS

Laser induced breakdown spectrum(LIBS) analysis is the method for chemical analysis with atom spectrum and ion in exited state from plasma,which is induced by converging highly powerful pulse laser beam onto samples.This paper illustrated t LIBS analysis method, and designed detector based on this principle and used the detector to analyze several metal elemental and mixture.With the studying on measuring methods of metal material and practical performance analysis on metal material importance of real-time portable LIBS detection and analysis was pointed out in this paper. This paper also gave detailed design scheme of metal detector based on LIBS metal analysis technology. It mainly included the following modules:high stability, low power consumption, wide spectrum laser source and light source driving module; Q-switch microchips solid laser module and Spectral analysis module.The Q-switch microchips solid laser module is designed by1064nm laser by myself.It is high peak power,hign repetitive frequency. Its output wavelength is1064nm,pulse width is6ns,the biggest single pulse energy is more than80mJ(2to80mJ),repeat rate is1to20Hz.According to the proposed method the LIBS metal detector was developed.Through the average number of spectrum,delay time,the influence of laser energy to best delay time,the paper analysed the best condition of test,and used to test many kinds of metal spectrums, and create LIBS database according to the sufficient varieties of metal plasma spectral data. At the same time,the paper do qualitative and quantitative analysis to sample,including seak peak of data,correct the overlapping interference of spectrum and the ownership of the spectrum line.But the system needs further improvement,such as increasing laser power stability, improve the accuracy and realizing the entire unit portablity.