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Experimental investigation on the infrared refraction and extinction properties of rock dust in tunneling face of coal mine

机译：煤矿巷道岩粉红外折射消光特性的实验研究

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Comprehensive experimental research on the fundamental optical properties of dust pollution in a coal mine is presented. Rock dust generated in a tunneling roadway was sampled and the spectral complex refractive index within an infrared range of 2.5-25 mu m was obtained by Fourier transform infrared spectroscopy measurement and Kramers-Kronig relation. Experimental results were validated to be consistent with equivalent optical constants simulated by effective medium theory based on component analysis of x-ray fluorescence, which illustrates that the top three mineral components are SiO2 (62.06%), Al2O3 (21.26%), and Fe2O3 (4.27%). The complex refractive index and the spatial distribution tested by a filter dust and particle size analyzer were involved in the simulation of extinction properties of rock dust along the tunneling roadway solved by the discrete ordinates method and Mie scattering model. The compared results illustrate that transmission is obviously enhanced with the increase of height from the floor but weakened with increasing horizontal distance from the air duct. (C) 2015 Optical Society of America
机译：提出了煤矿粉尘污染基本光学性质的综合实验研究。对在巷道中产生的岩尘进行采样，并通过傅里叶变换红外光谱测量和Kramers-Kronig关系获得在2.5-25μm红外范围内的光谱复合折射率。实验结果经验证与有效介质理论基于x射线荧光的成分分析模拟的等效光学常数相一致，这表明前三个矿物成分为SiO2（62.06％），Al2O3（21.26％）和Fe2O3（ 4.27％）。利用离散坐标法和米氏散射模型求解了复杂的折射率，并用滤尘和粒度分析仪测试了空间分布，从而模拟了沿巷道的岩屑的消光特性。比较结果表明，随着距地面高度的增加，传输明显增强，但随着距风道的水平距离增加，传输减弱。 （C）2015年美国眼镜学会

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