小麦品质的太赫兹波段光学与光谱特性研究

采用太赫兹时域光谱技术(THz-TDS)，以储藏小麦为研究对象，研究了霉变、虫蛀、发芽等小麦与正常小麦样品在0.2～1.6 THz波段的光学与光谱特性，采用傅里叶变换得到被测样品的频域光谱，并计算获得THz吸收系数和折射率等光学参数。结果表明，不同品质小麦具有不同的折射率和吸收系数，其中正常小麦比霉变、虫蚀和发芽小麦的吸收系数和折射率都高，且吸收系数在有效波段随频率的增加而增加，进而可以根据其在THz波段的特征谱进行判别。THz-TDS在小麦品质检测中的应用，为该技术在储粮品质检测和分析中提供新的实验方法，具有重要的应用前景。

Nondestructive Evaluation of Wheat Quality Using Terahertz Time Domain Spectroscopy

Terahertz time-domain spectroscopy (THz-TDS) is used to investigate the spectra properties of the wheat kernel with various deterioration degrees in the frequency range of 0.2～1.6 THz. The absorption coefficient and refractive index of normal, worm-eaten, moldy and sprouting wheat kernel were calculated. Comparison of the experimental data, clearly indicates that changes in the absorption coefficient and refractive index are recorded, different wheat samples have different optical parameters. The absorption coefficient of normal wheat sample is more obvious and higher than others; refractive index increases as the frequency increases. THz-TDS can be employed to evaluate the quality of wheat kernel nondestructively. The results show that THz-TDS is a promising and new experimental method for quality analyses and control for agricultural production detection. This study will provide an important guidance for nondestructive detecting the quality of stored-grain.