Lianjie Yang, Yang Li, Junjie Sun, Yun Zou. Reflection and Transmission of Laser Ultrasonic Waves on Surface Defects[J]. Laser & Optoelectronics Progress, 2019, 56(4): 041203
- Laser & Optoelectronics Progress
- Vol. 56, Issue 4, 041203 (2019)
Fig. 1. Experimental equipment
Fig. 2. Schematic of detection process. (a) Three-dimensional detection process of defect samples by laser point source scanning; (b) two-dimensional detection by A-scan
Fig. 3. Visualized dynamic images of ultrasonic wave at 6.08 μs in cracks with different depths. (a) 485 μm; (b) 1482 μm; (c) 1865 μm; (d) 3125 μm
Fig. 4. Results of signal analysis. (a) Reflected wave signal received at point M; (b) spectrogram corresponding to (a); (c) transmitted wave signal at point N
Fig. 5. Relationship between surface wave coefficients and defect depth. (a) Reflection coefficient; (b) transmission coefficient
Fig. 6. B-scanning images of cracks with different depths in Y direction and at X=10 mm. (a) 485 μm; (b) 1482 μm; (c) 1865 μm; (d) 3125 μm
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