Jisheng XU, Jiaojiao REN, Dandan ZHANG, Jian GU, Jiyang ZHANG, Lijuan LI, Junwen XUE. Terahertz Identification of Hot Melting Joint Defects in Polyethylene Pipe Based on Wavelet Scattering Network[J]. Acta Photonica Sinica, 2023, 52(1): 0112002
- Acta Photonica Sinica
- Vol. 52, Issue 1, 0112002 (2023)
Fig. 1. Actual hot melting welding process of polyethylene sheet
Fig. 2. Physical of THz-TDS system
Fig. 3. THz detection simulation diagram of polyethylene pipe
Fig. 4. THz detection waveform comparison
Fig. 5. The sample has not undergone planar processing and corresponding THz kurtosis imaging after hot fusion welding
Fig. 6. The Incomplete fusion sample before welding and the corresponding THz detection kurtosis imaging diagram
Fig. 7. The embedded object of inclusion defect sample and the corresponding THz kurtosis imaging are required
Fig. 8. Defect classification flow based on wavelet scattering network-convolution neural network
Fig. 9. Wavelet scattering framework
Fig. 10. CNN Network architecture
Fig. 11. Accuracy and loss of each iteration of the first training model
Fig. 12. Confusion matrix of test results using the first kind of training model
Fig. 13. Accuracy and loss of each iteration of the second training model
Fig. 14. Confusion matrix of test results using the second kind of training model
Fig. 15. The comparison chart between the number of defect recognition and the actual number of two training models
Fig. 16. Curve diagram of error between the number of defect recognition and the actual number of two training models
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Table 1. Dataset property table
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