太赫兹技术在烟叶香型分类中的应用

针对浓香型、中间型和清香型3种香型特征的烟叶，测定不同质量分数烟叶（烟叶与聚乙烯的混合物）的太赫兹透射光谱，并计算得到相应的太赫兹波段吸收系数和折射率谱线.结果发现，不同香型的烟叶对太赫兹时域信号会产生不同的延迟和衰减，所计算得到的吸收系数曲线和折射率曲线的变化规律和香气特征存在一一对应的关系.其中，烟叶香气浓郁程度与样本吸收系数呈正相关性，而与样本折射率呈现负相关性.本研究证实了其在烟叶质量评价方面应用的可能性.
Abstract: Tobacco leaves with strong, middle, fresh scent were tested in the experiments. The transmission spectra of the tobacco samples with different mass fraction (the mixture of tobacco and polyethylene) were obtained, and the corresponding absorption coefficient and refractive index spectra were calculated. Results show that tobacco leaves with different aroma types will induce different time delays and attenuations on the Terahertz time-domain signal, and there is a corresponding relationship between the aroma types and the absorption coefficient and refractive index spectra. The tobacco aroma of the tested samples has a positive correlation with the absorption coefficient, and a negative correlation with the refractive index.