Dengshan Li, Lina Li, Rencheng Zhang. Water Quality pH Value Determination for Visible-Near Infrared Spectroscopy Based on SPA and PSO-LSSVM[J]. Laser & Optoelectronics Progress, 2023, 60(1): 0130002
- Laser & Optoelectronics Progress
- Vol. 60, Issue 1, 0130002 (2023)
Fig. 1. Experimental spectra of samples with different pH values. (a) Original spectra; (b) spectra of distilled water
Fig. 2. Spectral preprocessing results based on S-G smoothing and SNV
Fig. 3. Feature wavelength screening based on SPA. (a) RMSEP of the validation set; (b) characteristic wavelength distribution
Fig. 4. Variation curve of RMSEP with the number of principal components
Fig. 5. Process of PSO optimizing LSSVM parameters. (a) PSO-LSSVM; (b) SPA-PSO-LSSVM
Fig. 6. Scatter plot of the predicted values of the SPA-PSO-LSSVM model for the validation set
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Table 1. Statistical results of pH value for the samples
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Table 2. Parameters and results of different modeling methods
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