| 光谱学与光谱分析 |
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| Quantitative Prediction of Holocellulose, Lignin, and Microfibril Angle of Chinese Fir by BP-ANN and NIR Spectrometry |
| DING Li1, XIANG Yu-hong1, HUANG An-min2, ZHANG Zhuo-yong1* |
1. Department of Chemistry, Capital Normal University, Beijing 100037, China
2. Chinese Academy Forestry, Beijing 100091, China |
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Abstract The amount of holocellulose, lignin, and microfibril angle of Chinese fir was predicted by using back-propagation neural network (BP-ANN) combined with near infrared (NIR) spectrometry. First, the data of original spectra were pretreated by Savitzky-Golay smoothing algorithm and the second derivative, then the data of near infrared spectrometry with 171 points were compressed to 86 points by using wavelet transform, and finally, the models were established by using BP-ANN. The models were validated using leave-n-out cross-validation approach，and the influences of the number of hidden neurons, learning rate, momentum, and epochs were discussed in the present paper. The prediction samples, which were not used in the model generation, were predicted by using the obtained models, the correlation coefficients (R2) of holocellulose, lignin and microfibril angle were 0.91, 0.90 and 0.87, respectively. The root mean square errors of prediction (RMSEP) of the established models were 0.86%, 0.33%, and 4.99%, respectively. The obtained results showed that the method is fast and nondestructive and can basically satisfy the requirement of quantitative analysis.
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Received: 2008-03-19
Accepted: 2008-06-22
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Corresponding Authors:
ZHANG Zhuo-yong
E-mail: gusto2008@vip.sina.com
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