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
- Journal of Infrared and Millimeter Waves
- Vol. 43, Issue 3, 344 (2024)
Fig. 1. Terahertz time-domain spectroscopy system
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. 4. Absorption coefficient 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
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Table 1. Experimental Parameters of porous tablets
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Table 2. Delay-time difference between the reference signal and the signals of samples at different pressures
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Table 3. The effective refractive index of tablets at different pressures by the time-domain method
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Table 4. The effective refractive index of tablets at different pressures by the frequency-domain method
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Table 5. Nominal porosity of tablets at different pressures
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