Qishu Wang, Da Mu, Tongyu Zhou, Jiaojiao Ren, Dandan Zhang, Yinjie Xin. Terahertz Nondestructive Test of Delamination Defects in Glass-Fiber-Reinforced Composite Materials[J]. Acta Optica Sinica, 2021, 41(17): 1712003
- Acta Optica Sinica
- Vol. 41, Issue 17, 1712003 (2021)
Fig. 1. Optical parameters of glass fiber composite material. (a) Refractive index; (b) extinction coefficient
Fig. 2. Glass fiber composite material structure
Fig. 3. Optical path of terahertz wave propagating in medium. (a) Optical path of terahertz wave propagation without delamination defect; (b) optical path of terahertz wave propagation with delamination defect
Fig. 4. Reflective simulation experiment structure
Fig. 5. Terahertz time domain spectroscopy system.(a) Physical picture; (b) schematic diagram
Fig. 6. Time-domain waveform simulation using finite difference time domain. (a) Without delamination defect; (b) delamination defect is 3 mm away from the upper surface of the sample; (c) delamination defect is 5 mm away from the upper surface of the sample
Fig. 7. B-scan figures. (a) Without delamination defect; (b) delamination defect is 3 mm away from the upper surface of the sample;(c) delamination defect is 5 mm away from the upper surface of the sample
Fig. 8. THz-TDS time-domain waveform of detected defects. (a) Without delamination defect; (b) delamination defect is 3 mm away from the upper surface of the sample;(c) delamination defect is 5 mm away from the upper surface of the sample
Fig. 9. Delamination defect imaging. (a) Delamination defect is 3 mm away from the upper surface of the sample; (b) column B-scan at position 1; (c) delamination defect is 5 mm away from the upper surface of the sample; (d) column B-scan at position 2
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Table 1. Delamination defect thickness and error detected by FDTD and THz-TDS system
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