| As a new technology,laser induced breakdown spectroscopy(LIBS)has been applied in the field of analysis.It has gained a lot of attention due to its technological superiority.In this paper,the laser-induced breakdown spectroscopy was used to quantitatively analyze medium and low alloy steels and TC11 titanium alloy.The analysis results of laser-induced breakdown spectroscopy are compared with two mature instrumental analysis methods.We quantitatively analyzed medium and low alloy steels successively by LIBS.A system consisting of a semiconductor pump laser and PMT detector was applied to quantitatively analyze the medium and low alloy steel by internal standard method in the atmosphere environment.Under the optimized experimental conditions with the laser pulse energy of 70 mJ,the pulse repetition rate of 20 Hz and argon gas flow rate of 4.5 L/min on the sample surface,the calibration curves of C,Si,Mn,Ni,Cr and Cu in the medium and low alloy steel were established.The correlation coefficients are all greater than 0.99.The TC11 titanium alloy was quantitatively analyzed by internal standard method in atmospheric environment with light pump laser and CCD detector.The experimental conditions were optimized.The laser energy was 73 mJ and argon gas flow rate on the sample surface was 8 L/min.The calibration curves of Al,Mo,Zr,Fe and Si in TC11 titanium alloy was established.The correlation was greater than 0.99,and that of Zr reached 0.999.The methods of LIBS,Spark-OES and ICP-OES were used to determine the actual samples and the results were analyzed comparatively.LIBS could analyze rapidly and has capability of on-line and real-time analysis.This experiment of quantitatively analyzing titanium alloy by LIBS provided the basis for real-time and long distance analysis of titanium alloy.This technique can be used to monitor the concentration of elements in titanium alloy to control the quality of the alloy during the melting process. |
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