Xu-dong SUN, Jun-bin LIU. THz Spectroscopy Detection of Insect Foreign Body Hidden in Tea Products[J]. Spectroscopy and Spectral Analysis, 2021, 41(9): 2723
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 9, 2723 (2021)
Fig. 1. Foreign bodies sample
(a): Cricket; (b): Worm
(a): Cricket; (b): Worm
Fig. 2. THz time-domain spectroscopy transmission experimental setup
Fig. 3. THz spectral absorption coefficient (a) and dielectric loss (b) of tea and foreign matters
Fig. 4. Analysis of response of spectroscopy to insect foreign bodies hidden in tea, absorption coefficient (a) and dielectric loss (b)
Fig. 5. Principal component analysis scores plot of black tea and foreign body samples
(a) : Absorption coefficient; (b): Dielectric loss
(a) : Absorption coefficient; (b): Dielectric loss
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Table 1. Tea and foreign bodies classification model results
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