Quan-lun LI, Zheng-guang CHEN, Xian-da SUN. Rapid Detection of Total Organic Carbon in Oil Shale Based on Near Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2022, 42(6): 1691
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 6, 1691 (2022)
Fig. 1. Original spectra
Fig. 2. Spectra after DT+BSC pretreatment
Fig. 3. RMSE values of models with different characteristic wavelength numbers
Fig. 4. Characteristic wavelengths selected based on SPA algorithm
Fig. 5. Stability index of each wavelength variable and random variable
Fig. 6. Characteristic wavelengths selected based on UVE algorithm
Fig. 7. Process of selecting characteristic wavelengths based on CARS algorithm
Fig. 8. Characteristic wavelengths selected based on CARS algorithm
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Table 1. Modeling results before and after removing outlier samples
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Table 2. Modeling results under different pretreatment methods
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Table 3. Sample set division
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Table 4. Modeling results of PLS, RF and SVM
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