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《Journal of South China University of Technology(Natural Science Edition)》 2016-04
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Investigation into Parameters Optimization for Reducing Interference of Plasma Lines of Fly Ash

YAO Shun-chun;YIN Ke-jing;BIAN Jin-tian;LU Ji-dong;FAN Yi-song;XU Jia-long;BAI Kai-jie;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization,South China University of Technology;State Key Laboratory of Pulsed Power Laser Technology,Electronic Engineering Institute;  
This paper deals with the interference of C and Fe plasma lines existing in the measurement of unburned carbon in fly ash by means of laser-induced breakdown spectroscopy( LIBS),and explores the interference suppression based on the parameter optimization by experiments. In the investigation,first,according to the excitation and time evolution properties of C and Fe lines,the spectral line interference at various pulse energy and time delay are analyzed in a comparison way,and the optimized parameters are obtained. Then,two multiple regression models describing the unburned carbon are constructed respectively by using the peak intensity and the integrated intensity of elemental lines. Analytical results show that the interference between C and Fe lines at about 248 nm can effectively be reduced by optimizing the pulse energy and the time delay; and that,in the optimized conditions,the intensity of Fe 247. 98 nm line decreases,while C 247. 86 nm line with high signal-to-noise ratio is obtained. Moreover,it is found that the multiple regression model constructed by peak intensity is reliable,with a regression coefficient r2 of 0. 999 and an intercept of 0. 005.
【Fund】: 国家自然科学基金资助项目(51206055 51476061);; 脉冲功率激光技术国家重点实验室开放基金(SKL2013KF03);; “广东特支计划”科技青年拔尖人才资助项目(2014TQ01N334);; 广州市珠江科技新星专项(2014J2200054)~~
【CateGory Index】: TN249
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