Investigation on the Delay Time of Coal Experiment by Laser-Induced Breakdown Spectroscopy
LI Jie1,LU Ji-dong1*,XIE Cheng-li1,LIN Zhao-xiang2,ZHANG Wen-yan2,LI Yong1
1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China 2. College of Electrics and Information Engineering, South-Central University for Nationalities, Wuhan 430074, China
Abstract：Laser-induced breakdown spectroscopy is a new technology of elementary analysis, and it will be used in coal analysis. The delay time of signal is an important parameter of spectral analysis. A LIBS system was set up and three kinds of coal (Jiangxipingxiang coal, Shanxixishan coal and Guizhoupingzhai coal) were chosen for this investigation. The spectra in the range of 240 to 250 nm and 275 to 290 nm of the each three coal samples are shown and they record several spectral lines of components such as C, Mg and Si according to the NIST database. The temporal evolution of SNR of spectral line was obtained, and the value of SNR increased with the time delay, then decayed. The temporal evolution of SNR was different as the coal, element and spectral line differs. Finally, optimum delay time of each spectral lines of elements in the coal samples was calculated according to the biggest value of signal-to-noise ratio, and the relation between the characteristic of coal, element, spectral line and the optimum delay time was analyzed.
Key words：Coal analysis;Laser-induced breakdown spectroscopy;Delay time;Signal-to-noise ratio (SNR)
李捷1,陆继东1*,谢承利1,林兆祥2,张文艳2,李勇1. 激光感生击穿煤质实验中延迟时间的研究[J]. 光谱学与光谱分析, 2008, 28(04): 736-739.
LI Jie1,LU Ji-dong1*,XIE Cheng-li1,LIN Zhao-xiang2,ZHANG Wen-yan2,LI Yong1. Investigation on the Delay Time of Coal Experiment by Laser-Induced Breakdown Spectroscopy. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(04): 736-739.
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