Non-contact subsurface thermography for high-temperature metallic structures using laser ultrasound and wave-equation-based inversion

Hu, Lei; Zuo, Peng; Sun, Zeqing; Fan, Zheng

doi:10.1016/j.ymssp.2023.110378

Mechanical Systems and Signal Processing

2023

DOI: 10.1016/j.ymssp.2023.110378

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Non-contact subsurface thermography for high-temperature metallic structures using laser ultrasound and wave-equation-based inversion

Lei Hu

Peng Zuo

Zeqing Sun

et al.

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2024

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Subsurface defect detection of high-temperatured components with laser induced surface wave

Zeng,

Qiu,

et al. 2024

J. Phys.: Conf. Ser.

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Subsurface defects are detrimental to the safety and integrity of critical components in various fields, particularly for those used in high-temperature environments. For this reason, a reliable non-destructive evaluation (NDE) method for in-situ inspection of subsurface defects of high-temperatured components is highly desired. Laser ultrasonic technique offers a promising potential to accommodate the demands in virtue of non-contact generation and detection of ultrasonic waves. In this work, laser ultrasosnic inspection of subsurface defects in high-temperatured components is proposed, which exploits the modal conversion of surface longitudinal wave to Rayleigh wave. The modal conversion was firstly investigated with finite element simulation, from which the phenomenon of modal conversion can be readily identified. Thereafter, an experimental setup is built to verify the feasibility and effectiveness of proposed method. Notably, a delay-and-sum method based on a scanning procedure is conducted to coherently increase the detection sensitivity of subsurface defects, since the surface longitudinal wave rapidly vanishes with propagation distance., and the temperature-dependant velocity variation can be adaptively compensated. This work provides a viable route for in-situ inspection of subsurface defects in high-temperatured components where conventional ultrasonic method fails, and it would find potential applications in broad fields, such as coating quality evaluation in fabrication, bearing assessment under load, and in-situ monitoring for additive manufacturing.

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Subsurface defect detection of high-temperatured components with laser induced surface wave

Zeng,

Qiu,

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

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Non-contact subsurface thermography for high-temperature metallic structures using laser ultrasound and wave-equation-based inversion

Cited by 1 publication

References 43 publications

Subsurface defect detection of high-temperatured components with laser induced surface wave

Subsurface defect detection of high-temperatured components with laser induced surface wave

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