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。

Laser-induced breakdown spectroscopy was used to analyze coal samples, and the influence of sample morphology on laser ablation properties of coal was analyzed. Coal samples with different morphologies were ablated by 532 nm pulse laser, and plasma was formed at atmospheric pressure. The multi-channel fiber spectroscopy and CCD detector were used to collect and detect of plasma emission signal. The change laws of plasma temperature, electron density and spectral-line intensity with laser energy for different coal samples were analyzed. The analysis results show that sample morphology is a significant influencing factor for laser ablation properties of coal samples. The change laws of plasma temperature, electron density and spectral-line intensity of different samples are obviously different. In the same experimental conditions, the plasma temperature and electron density of pulverized coal are higher than those of lump coal, but the spectral-lines intensity of lump coal is higher than that of pulverized coal.