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The Inspection of CFRP Laminate with Subsurface Defects by Laser Arrays Scanning Thermography (LAsST)

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Abstract

Laser array scanning thermography (LAsST) was used to detect the subsurface defects of carbon fiber reinforced composite (CFRP). A series of bottom flat hole (BFHs) of CFRP were prepared for LAsST. Truncation pseudo-static matrix reconstruction (TC-PSMR) method was used to reconstruct the thermal response signal. Fast Fourier transform (FFT), principal component analysis (PCA) and partial least squares regression (PLSR) were used to process the thermal response signals, forming FFT image, PCA image, and PLSR image. The signal noise ratios (SNRs) of defects is calculated, and it is used to evaluate the defect detection ability of different post-processing algorithms. The experimental results show that the image based on FFT phase has a higher signal-to-noise ratio with PLSR image, and the FFT amplitude image and PLSR image can accurately represent the defect size.

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Acknowledgements

This work was supported by the Foundation for Innovative Research Groups of the National Nature Science Foundation of China under Grant No. 51521003, National Natural Science Foundation of China under Contract Nos. 61571153, 51173034, Self-planned Task of State Key Laboratory of Robotics and System (HIT), and the Programme of Introducing Talents of Discipline of Universities (Grant No. B07108) for the research support.

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Authors and Affiliations

  1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Fei Wang, Junyan Liu & Yang Wang

  2. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Fei Wang, Junyan Liu & Yang Wang

  3. School of Mechanical Engineering, Guizhou University, Guiyang, 550025, People’s Republic of China

    Jiacheng Wei & Lin He

  4. Liupanshui Normal University, Liupanshui, 553004, People’s Republic of China

    Lin He

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  1. Jiacheng Wei
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  2. Fei Wang
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  3. Junyan Liu
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  4. Yang Wang
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  5. Lin He
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Correspondence to Junyan Liu or Yang Wang.

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Wei, J., Wang, F., Liu, J. et al. The Inspection of CFRP Laminate with Subsurface Defects by Laser Arrays Scanning Thermography (LAsST). Int J Thermophys 41, 60 (2020). https://doi.org/10.1007/s10765-020-02639-2

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  • DOI: https://doi.org/10.1007/s10765-020-02639-2

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