Haisheng Song, Linzhao Ma, Engong Zhu, Yifan Wang, Yuping Liu, Wenjian Sun, Peng Peng, Chengfei Li. Plastic Classification and Recognition by Laser-Induced Breakdown Spectroscopy and GA-BP Neural Network[J]. Laser & Optoelectronics Progress, 2020, 57(15): 153002
- Laser & Optoelectronics Progress
- Vol. 57, Issue 15, 153002 (2020)
Fig. 1. Composition of BP neural network
Fig. 2. Flow chart of GA-BP neural network
Fig. 3. Schematic diagram of the experimental device
Fig. 4. Defocused state of laser burning sample surface. (a) Positive focus; (b) focus; (c) negative focus
Fig. 5. Relationship between the characteristic spectral line and the amount of defocusing
Fig. 6. Emission spectrum of ABS. (a) Original spectrum; (b) spectrum after treatment
Fig. 7. First three main component dispersion points of different plastic samples
Fig. 8. Prediction results of PCA-GA-BP neural network
Fig. 9. Performance comparison of different algorithms. (a) GA; (b) PCA-BP neural network; (c) PCA-GA-BP neural network
Fig. 10. Classification errors of three neural networks
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Table 1. Molecular formula and color of 9 plastic samples
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Table 2. Characteristic spectral line and wavelength
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Table 3. Training results of three neural networks
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