Li Jie, Lu Ji-Dong, Xie Cheng-Li, Lin Zhao-Xiang, Zhang Wen-Yan, Li Yong
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Apr;28(4):736-9.
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 op timum delay time was analyzed.
激光诱导击穿光谱技术是一种新型的元素分析技术，将用于煤炭分析。信号延迟时间是光谱分析的一个重要参数。搭建了一个激光诱导击穿光谱系统，并选取了三种煤（江西萍乡煤、山西西山煤和贵州平寨煤）进行本研究。展示了三种煤样在240至250纳米以及275至290纳米范围内的光谱，根据美国国家标准与技术研究院数据库，这些光谱记录了碳、镁和硅等成分的多条谱线。获得了谱线信噪比的时间演化情况，信噪比的值随时间延迟先增大后衰减。不同煤种、元素和谱线的信噪比时间演化情况不同。最后，根据信噪比的最大值计算出煤样中各元素谱线的最佳延迟时间，并分析了煤质、元素、谱线特征与最佳延迟时间之间的关系。
