Yifei Zhang, Ling Yuan, Chenyin Ni, Zhonghua Shen, Jian Lu. Photoacoustic Nonlinearity of Microcracks Under Different Contact States[J]. Laser & Optoelectronics Progress, 2021, 58(7): 0712003
- Laser & Optoelectronics Progress
- Vol. 58, Issue 7, 0712003 (2021)
Fig. 1. Schematic diagram of the contact pair
![Temperature change curve of the intensity modulated laser spot center area[30]](/richHtml/lop/2021/58/7/0712003/img_2.jpg)
Fig. 2. Temperature change curve of the intensity modulated laser spot center area[30]
Fig. 3. Schematic diagram of the model
Fig. 4. Schematic diagram of the contact state of cracks with different widths under laser irradiation
Fig. 5. Relationship between
Fig. 6. Spectra under different crack widths
Fig. 7. First-order sidelobes and main frequency amplitudes under different crack widths
Fig. 8. Variation curve of photoacoustic signal amplitude with heating power. (a) Vibration meter detection (heating light is not modulated); (b) vibration meter detection (heating light modulation); (c) contact accelerometer detection (heating light modulation)[16]
Fig. 9. Stress-strain curves of cracks in different contact states
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Table 1. Main parameters of the black glass
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