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Laser & Optoelectronics Progress, Volume. 58, Issue 7, 0712003(2021)

Photoacoustic Nonlinearity of Microcracks Under Different Contact States

Yifei Zhang1, Ling Yuan1、*, Chenyin Ni2, Zhonghua Shen1, and Jian Lu1
Author Affiliations
  • 1School of Science, Nanjing University of Science & Technology, Nanjing , Jiangsu 210094, China
  • 2School of Electronic and Optical Engineering, Nanjing University of Science & Technology, Nanjing , Jiangsu 210094, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (10)
    Equations (9)
    References (33)
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    Figures & Tables(10)
    Schematic diagram of the contact pair

    Fig. 1. Schematic diagram of the contact pair

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    Temperature change curve of the intensity modulated laser spot center area[30]

    Fig. 2. Temperature change curve of the intensity modulated laser spot center area[30]

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    Schematic diagram of the model

    Fig. 3. Schematic diagram of the model

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    Schematic diagram of the contact state of cracks with different widths under laser irradiation

    Fig. 4. Schematic diagram of the contact state of cracks with different widths under laser irradiation

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    Relationship between β and crack width

    Fig. 5. Relationship between β and crack width

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    Spectra under different crack widths

    Fig. 6. Spectra under different crack widths

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    First-order sidelobes and main frequency amplitudes under different crack widths

    Fig. 7. First-order sidelobes and main frequency amplitudes under different crack widths

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    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. 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]

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    Stress-strain curves of cracks in different contact states

    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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      Table 1. Main parameters of the black glass

      ParameterValue
      Young's modulus E /GPa38.9
      Density ρ /（kg·m-3）2616
      Poisson's ratio ν0.22
      Coefficient of thermal expansion α /K-15.5×10-6
      Thermal conductivity κ /[W·（m·K）-1]1.03
      Heat capacity at constant pressure CP /[J·（kg·K）-1]720
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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

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    Paper Information

    Category: Instrumentation, Measurement and Metrology

    Received: Aug. 1, 2020

    Accepted: Sep. 15, 2020

    Published Online: Apr. 25, 2021

    The Author Email: Ling Yuan (yuanling@njust.edu.cn)

    DOI:10.3788/LOP202158.0712003

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology