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将激光诱导击穿光谱技术应用于煤质检测,分析了燃煤形态对激光烧蚀特性的影响。利用532 nm激光在大气常压环境下烧蚀样品,同时使用多通道光纤光谱仪和CCD探测器对激光烧蚀形成的等离子体发射信号进行分光和探测。对比分析两种不同形态煤样的等离子体温度、电子密度以及元素特征谱线强度随脉冲能量变化的规律。实验研究表明,样品形态对燃煤的激光烧蚀特性有显著影响。不同形态燃煤的等离子体温度、电子密度以及元素特征谱线强度随脉冲能量的变化规律有所不同。相同实验条件下,粉状煤样形成的等离子体温度和电子密度均比块状煤样的高,但块状煤样的元素特征谱线强度则更大。
The laser-induced breakdown spectroscopy was applied to the detection of coal quality, and the effect of coal combustion morphology on laser ablation characteristics was analyzed. The samples were ablated with 532 nm laser at atmospheric pressure and at the same time multi-channel fiber spectrometer and CCD detector were used to separate and detect the plasma emission signals generated by laser ablation. The plasma temperature, electron density and elemental characteristic intensity of two different forms of coal samples were compared and analyzed with the variation of pulse energy. Experimental studies show that the sample morphology has a significant effect on the laser ablation properties of coal. The plasma temperature, electron density and elemental characteristic line intensity of different forms of coal vary with pulse energy. Under the same experimental conditions, the plasma temperature and electron density of pulverized coal samples are higher than that of massive coal samples, but the intensity of elemental characteristic lines of massive coal samples is even greater.