Jing LIU, Hai-shun LIU, Jian ZUO, Cun-lin ZHANG, Yue-jin ZHAO, Mei-yan LIANG. Terahertz Spectrum Analysis for Binary Amino Acids Mixture Based on Empirical Mode Decomposition[J]. Spectroscopy and Spectral Analysis, 2020, 40(10): 3061
- Spectroscopy and Spectral Analysis
- Vol. 40, Issue 10, 3061 (2020)
Fig. 1. Flowchart of EMD-PLS modeling
Fig. 2. (a) 28 original temporal signals and (b) absorption spectra of 28 original amino acids samples
Fig. 3. EMD decomposed IMFs and residual function of concentration=0% sample
Fig. 4. The corresponding absorption spectra of concentration=0% sample for the first one IMFs (IMF1), two IMFs superposition (IMF1+IMF2), three IMFs superposition (IMF1+IMF2+IMF3), four IMFs superposition (IMF1+IMF2+IMF3+IMF4) and five IMFs superposition (IMF1+IMF2+IMF3+IMF4+IMF5)
Fig. 5. Scatter plots of the actual concentration versus the predicted concentration using (a) PLS model and (b) EMD-PLS model (IMF1+IMF2+IMF3+IMF4) for different concentrations of amino acids mixture samples
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Table 1. PLS calibration and prediction performance statistics for binary mixtures
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