Qiang Chen, Qiang Wang, Xiaohong Gu, Yue Yu, Zhangwei Ling. Inspection of Aging and Defects of Polyethylene Pipe Joints Based on THz-TDS[J]. Laser & Optoelectronics Progress, 2019, 56(22): 223001
- Laser & Optoelectronics Progress
- Vol. 56, Issue 22, 223001 (2019)
Fig. 1. THz-TDS system. (a) Light path of transmissive THz-TDS system; (b) z3 reflective imaging system
Fig. 2. Aging test setup and aging samples. (a) Aging test chamber; (b) aging samples
Fig. 3. Defect samples
Fig. 4. THz waveforms of samples with different aging time. (a) Time-domain waveform; (b) frequency-domain waveform
Fig. 5. Reflective indices of samples with different aging time
Fig. 6. Absorption coefficients of samples with different aging time
Fig. 7. Reflective imaging results of samples. (a) Sample with scratch; (b) sample with delamination; (c) sample with metal ring
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