Tongyu Zhou, Lijuan Li, Jiaojiao Ren, Dandan Zhang, Jiyang Zhang. Pulsed Terahertz Nondestructive Testing of Glass Fiber Reinforced Plastics Based on FDTD[J]. Acta Optica Sinica, 2020, 40(12): 1226002
- Acta Optica Sinica
- Vol. 40, Issue 12, 1226002 (2020)
Fig. 1. Yee cells in medium space divided by FDTD method
Fig. 2. Results before and after modulation of terahertz pulse signal. (a) In time-domain; (b) in frequency-domain
Fig. 3. Structural drawing of FRP production
Fig. 4. Geometric model for THz pulse simulation detection. (a) Geometric model of debonding defects; (b) geometric model of delamination defects
Fig. 5. Optical parameter curves. (a) Refractive index curve; (b) extinction coefficient curve
Fig. 6. Optical path map for terahertz pulse simulation with adhesive debonding model. (a) Without debonding defects; (b) with debonding defects
Fig. 7. THz pulse simulation results with debonding defects. (a) No defects; (b) debonding defects with ΔH1=60 μm; (c) debonding defects with ΔH1=100 μm; (d) debonding defects with ΔH1=200 μm
Fig. 8. Optical path for THz pulse simulation with FRP delamination model. (a) No defects; (b) one layered delamination defects; (c) two layered delamination defects
Fig. 9. THz pulse simulation results with delamination defects. (a) No defects; (b) one layered delamination defect with ΔH2=80 μm; (c) two layered delamination defects with ΔH2=80 μm
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