Laser & Optoelectronics Progress, Volume. 58, Issue 7, 0712003(2021)
Photoacoustic Nonlinearity of Microcracks Under Different Contact States
Fig. 1. Schematic diagram of the contact pair
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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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
Category: Instrumentation, Measurement and Metrology
Received: Aug. 1, 2020
Accepted: Sep. 15, 2020
Published Online: Apr. 25, 2021
The Author Email: Yuan Ling (yuanling@njust.edu.cn)