| 光谱学与光谱分析 |
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| Characteristic Wavelength Variable Optimization of Near-Infrared Spectroscopy Based on Kalman Filtering |
| WANG Li-qi1, GE Hui-fang1, LI Gui-bin1, YU Dian-yu2, HU Li-zhi2, JIANG Lian-zhou2* |
1. School of Computer and Information Engineering, Harbin University of Commerce, Harbin 150028, China
2. School of Food, Northeast Agricultural University, Harbin 150030, China |
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Abstract Combining classical Kalman filter with NIR analysis technology, a new method of characteristic wavelength variable selection, namely Kalman filtering method, is presented. The principle of Kalman filter for selecting optimal wavelength variable was analyzed. The wavelength selection algorithm was designed and applied to NIR detection of soybean oil acid value. First, the PLS (partial least squares) models were established by using different absorption bands of oil. The 4 472～5 000 cm-1 characteristic band of oil acid value, including 132 wavelengths, was selected preliminarily. Then the Kalman filter was used to select characteristic wavelengths further. The PLS calibration model was established using selected 22 characteristic wavelength variables, the determination coefficient R2 of prediction set and RMSEP (root mean squared error of prediction) are 0.970 8 and 0.125 4 respectively, equivalent to that of 132 wavelengths, however, the number of wavelength variables was reduced to 16.67%. This algorithm is deterministic iteration, without complex parameters setting and randomicity of variable selection, and its physical significance was well defined. The modeling using a few selected characteristic wavelength variables which affected modeling effect heavily, instead of total spectrum, can make the complexity of model decreased, meanwhile the robustness of model improved. The research offered important reference for developing special oil near infrared spectroscopy analysis instruments on next step.
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Received: 2013-07-03
Accepted: 2013-10-15
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Corresponding Authors:
JIANG Lian-zhou
E-mail: jlzname@163.com
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