The Differences in the Dried Tangerine Peels Stored for Different Years Revealed by Terahertz Spectroscopy and Imaging
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Abstract:
In the study, five kinds of dried tangerine peels stored for different years (3, 5, 10, 15 and 20 years) were subjected to differential characterization and identification of storage years by terahertz spectroscopy and imaging technique and statistical analysis method. The results showed that significant differences and consistent changing trends were found in the terahertz spectral parameters (including the absorption coefficient, refractive index, complex dielectric constant imaginary part and dielectric loss tangent value) as well as the contrast of terahertz frequency-domain images among the different dried tangerine peel samples: decreasing gradually with an increase of storage year for those stored for 3~15 years, whilst increasing gradually with an increase of storage year for those stored for 15~20 years. Moreover, statistical analysis and independent sample t-test were carried out for each of the terahertz spectral parameters in the range of 0.6~1.8 THz, and the spectral parameter data with high consistency and significant difference (p<0.05) were extracted to establish a highly efficient prediction model for storage years of dried tangerine peels based on the principal component analysis-support vector machine (PCA-SVM). The accuracy of the model reached over 94%. This result indicates the feasibility and superiority of the terahertz technology in the characterization of the differences between tangerine peels and in the identification of storage years for dried tangerine peels.
