散射对煤粉太赫兹光谱定量分析的应用研究
发布时间：2019-05-23 08:12
【摘要】：在利用太赫兹光谱系统对煤质进行定量分析的过程中,样品压片内部煤粉颗粒和高密度聚乙烯颗粒之间的空气孔隙使太赫兹波产生散射进而导致所测煤样本征吸收光谱产生误差。针对样品压片中煤粉颗粒和空气孔隙存在形式的不同建立了压片等效结构,采用Foldy-Twersky EFA理论和迭代Waterman-Truell EFA理论在2~3.5THz频率区间内对压片内部的散射情况进行了数值研究,建立了煤样本征吸收谱提取模型,并利用该模型分别对六种不同粒径范围的煤粉-高密度聚乙烯颗粒混合物压片样品进行了太赫兹域消光光谱的散射校正处理。实验结果表明当煤粉颗粒直径小于38.5μm时,高密度聚乙烯颗粒间空气孔隙对所测样品消光光谱的影响处于主导地位,当煤粉颗粒粒径处于38.5~55μm时,煤粉颗粒散射与空气孔隙散射导致的消光在数值上较为接近,随着颗粒直径进一步增加,煤粉自身散射对吸收光谱的影响也逐步增强并处于主导地位。散射校正前后煤样吸收谱的相关系数和均方根误差表明文中所述模型能够有效减小105μm以下粒径范围内散射对煤粉-高密度聚乙烯混合物压片样品太赫兹吸收光谱的影响,为太赫兹域煤质吸收光谱的定量分析提供了理论基础。
[Abstract]:In the process of quantitative analysis of coal quality by terahertz spectral system, The air pores between pulverized coal particles and HDPE particles in the sample pressure lead to the scattering of terahertz wave, which leads to the error of the intrinsic absorption spectrum of the measured coal samples. The equivalent structure of pulverized coal particles and air pores is established according to the different forms of pulverized coal particles and air pores in the sample compression sheet. The scattering inside the sheet is studied by using Foldy-Twersky EFA theory and iterative Waterman-Truell EFA theory in the 2~3.5THz frequency range. The intrinsic absorption spectrum extraction model of coal samples was established, and the scattering correction of extinction spectra in terahertz domain was carried out for six kinds of pulverized coal-HDPE particle mixture samples with different particle sizes. The experimental results show that when the diameter of pulverized coal particles is less than 38.5 渭 m, the effect of air pores between HDPE particles on the extinction spectra of the samples is dominant, and when the particle size of pulverized coal particles is 38.5 ~ 55 渭 m, The extinction caused by pulverized coal particle scattering is close to that caused by air pore scattering. With the further increase of particle diameter, the influence of pulverized coal scattering on absorption spectrum is gradually enhanced and dominant. The correlation coefficient and root mean square error of absorption spectrum of coal sample before and after scattering correction show that the model in this paper can effectively reduce the influence of scattering in the particle size range below 105 渭 m on terahertz absorption spectrum of pulverized coal-high density polyethylene mixture. It provides a theoretical basis for the quantitative analysis of coal absorption spectra in terahertz region.
【作者单位】： 中国矿业大学信息与控制工程学院;江苏师范大学物理与电子工程学院;
【基金】：国家重点研发计划项目(2016YFC0801808)资助
【分类号】：O433.4
本文编号：2483739
[Abstract]:In the process of quantitative analysis of coal quality by terahertz spectral system, The air pores between pulverized coal particles and HDPE particles in the sample pressure lead to the scattering of terahertz wave, which leads to the error of the intrinsic absorption spectrum of the measured coal samples. The equivalent structure of pulverized coal particles and air pores is established according to the different forms of pulverized coal particles and air pores in the sample compression sheet. The scattering inside the sheet is studied by using Foldy-Twersky EFA theory and iterative Waterman-Truell EFA theory in the 2~3.5THz frequency range. The intrinsic absorption spectrum extraction model of coal samples was established, and the scattering correction of extinction spectra in terahertz domain was carried out for six kinds of pulverized coal-HDPE particle mixture samples with different particle sizes. The experimental results show that when the diameter of pulverized coal particles is less than 38.5 渭 m, the effect of air pores between HDPE particles on the extinction spectra of the samples is dominant, and when the particle size of pulverized coal particles is 38.5 ~ 55 渭 m, The extinction caused by pulverized coal particle scattering is close to that caused by air pore scattering. With the further increase of particle diameter, the influence of pulverized coal scattering on absorption spectrum is gradually enhanced and dominant. The correlation coefficient and root mean square error of absorption spectrum of coal sample before and after scattering correction show that the model in this paper can effectively reduce the influence of scattering in the particle size range below 105 渭 m on terahertz absorption spectrum of pulverized coal-high density polyethylene mixture. It provides a theoretical basis for the quantitative analysis of coal absorption spectra in terahertz region.
【作者单位】： 中国矿业大学信息与控制工程学院;江苏师范大学物理与电子工程学院;
【基金】：国家重点研发计划项目(2016YFC0801808)资助
【分类号】：O433.4
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