Journal of Infrared and Millimeter Waves, Volume. 43, Issue 3, 344(2024)
Terahertz study on the porosity of porous traditional Chinese medicine tablets by effective medium models
Figures & Tables(12)
Fig. 2. Terahertz time-domain spectra of reference and tablets at different pressures. The pressures on the tablets are: (a) 5 kN; (b) 7.5 kN; (c) 10 kN; (d) 12.5 kN; (e) 15 kN; (f) 17.5 kN
Fig. 3. The refractive index spectra of tablets at different pressures
Fig. 5. The linear regression relationship between nominal porosity and effective refractive index by (a) TD method, (b) FD method
Fig. 6. The regression relations between the nominal porosity and the porosities obtained by four effective medium theory models based on: (a) TD method; (b) FD method
Fig. 7. Comparison of the quantitative performances of different porosity models:(a) the values of R2 and R2CV; (b) the values of RMSE and RMSECV; (c) the values of RPD
Table 1. Experimental Parameters of porous tablets
View tableView in ArticleTable 1. Experimental Parameters of porous tablets
编号 压力/kN 质量/mg 厚度/mm 1 5 200.89 1.54 2 7.5 201.20 1.46 3 10 201.05 1.37 4 12.5 201.13 1.31 5 15 201.67 1.25 6 17.5 201.64 1.20
Table 2. Delay-time difference between the reference signal and the signals of samples at different pressures
View tableView in ArticleTable 2. Delay-time difference between the reference signal and the signals of samples at different pressures
压力/kN 5 7.5 10 12.5 15 17.5 延迟时间/ps 3.159 0 3.186 0 3.253 5 3.199 5 3.240 0 3.232 3
Table 3. The effective refractive index of tablets at different pressures by the time-domain method
View tableView in ArticleTable 3. The effective refractive index of tablets at different pressures by the time-domain method
压力/kN 5 7.5 10 12.5 15 17.5 有效折射率 1.615 0 1.654 2 1.712 0 1.732 2 1.777 1 1.807 5
Table 4. The effective refractive index of tablets at different pressures by the frequency-domain method
View tableView in ArticleTable 4. The effective refractive index of tablets at different pressures by the frequency-domain method
压力/kN 5 7.5 10 12.5 15 17.5 有效折射率 1.621 2 1.662 1 1.722 5 1.740 8 1.787 4 1.814 7
Table 5. Nominal porosity of tablets at different pressures
View tableView in ArticleTable 5. Nominal porosity of tablets at different pressures
压力/kN 5 7.5 10 12.5 15 17.5 0.283 5 0.243 0 0.193 9 0.156 7 0.113 8 0.077 0
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Xu LI, Meng-Yuan ZHANG, Wen-Yue ZHAO, Jian ZUO, Wei-Feng ZHU, Zhe LI, Yu-Lei SHI, Cun-Lin ZHANG. Terahertz study on the porosity of porous traditional Chinese medicine tablets by effective medium models[J]. Journal of Infrared and Millimeter Waves, 2024, 43(3): 344
Paper Information
Category: Research Articles
Received: Jul. 27, 2023
Accepted: --
Published Online: Apr. 29, 2024
The Author Email: Jian ZUO (zuoj@cnu.edu.cn), Zhe LI (lizhezd@163.com)
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