Laser & Optoelectronics Progress, Volume. 58, Issue 1, 112002(2021)
Method of Food and Drug Detection Under Shielding of Common Wrappings Based on Terahertz Time Domain Spectroscopy
Figures & Tables(10)
Fig. 2. Treatment results of different samples before and after water vapor absorption interference suppression. (a) EPE; (b) loratadine
Fig. 3. Different performance curves of 7 kinds of wrapping materials. (a) Refractive index; (b) absorption coefficient
Fig. 4. Different performance curves of starch samples covered by multiple wrappers. (a) Refractive index; (b) absorption coefficient
Fig. 5. Different performance curves of sucrose crystals covered by multiple coatings. (a) Refractive index; (b) absorption coefficient
Fig. 6. Different performance curves of loratadine covered by multiple wrappers. (a) Refractive index; (b) absorption coefficient
Table 1. Types and characteristics of materials
View tableTable 1. Types and characteristics of materials
No. Wrapping material Material thickness/mm Experimental characteristic 1 Plastic bag 0.32 Double layer 2 Paper 5.34 Four sheets of paper folded twice 3 Cotton 14.43 Two pieces of compression 4 Foam board 6.99 EPE sheet 5 Tape 0.21 Four layers pasting 6 Plastic bottle slice 0.46 Chun Yue mineral water bottle 7 Wood board 3.22 Double pasting
Table 2. Comparison of characteristics of food and medicine
View tableTable 2. Comparison of characteristics of food and medicine
No. Sample Material thickness /mm Experimental characteristic a Starch 1.27 Plastic bag uniformly compacted and sealed b Sucrose 5.99 Cutting square crystal along the crystal dissociation plane c Loratadine 3.45 Pharmaceutical standard tablets
Table 3. Inhibitory effect of atmospheric absorption
View tableTable 3. Inhibitory effect of atmospheric absorption
No. Material Suppression maximum Average inhibitory ability/% 1 Plastic bag 0.926 91.7 2 Paper 0.954 89.6 3 Cotton 0.917 83.4 4 Foam board 0.964 95.5 5 Tape 0.970 93.1 6 Plastic bottle slice 0.942 92.8 7 Wood board 0.889 73.3 8 Starch 0.800 72.3 9 Sucrose 0.920 74.9 10 Loratadine 0.902 75.9
Table 4. Refractive index parameters and characteristic absorption peak positions of three samples
View tableTable 4. Refractive index parameters and characteristic absorption peak positions of three samples
No. Sample Average refractive index Characteristic absorption peak position/THz a Starch 2.353 b Sucrose 1.824 0.0590, 0.0730, 0.1025, 0.1245, 0.1465, 0.1685, 0.8130, 1.1060, 1.1280, 1.1790, 1.2230, 1.3620 c Loratadine 1.632 0.1685, 0.1904, 0.2124, 0.2344, 0.2637, 0.2856, 0.5347, 0.8936, 1.0690, 1.2380, 1.3260, 1.3700, 1.5010, 1.5670
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Cao Enda, Yu Yong, Song Changbo, Zhao Yiming. Method of Food and Drug Detection Under Shielding of Common Wrappings Based on Terahertz Time Domain Spectroscopy[J]. Laser & Optoelectronics Progress, 2021, 58(1): 112002
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Apr. 7, 2020
Accepted: --
Published Online: Jan. 28, 2021
The Author Email: Enda Cao (Enda_Cao@163.com)
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