Speckle pattern interferometry excited by pulsed laser for crack size detection

Yaowen Zhu; Zhenkai Chen; Wenjing Zhou; Yingjie Yu

doi:10.1117/12.3023147

15 February 2024 Speckle pattern interferometry excited by pulsed laser for crack size detection

Yaowen Zhu, Zhenkai Chen, Wenjing Zhou, Yingjie Yu

Proceedings Volume 13069, International Conference on Optical and Photonic Engineering (icOPEN 2023); 1306913 (2024) https://doi.org/10.1117/12.3023147
Event: International Conference on Optical and Photonic Engineering (icOPEN 2023), 2023, Singapore, Singapore

Abstract

Defect detection is an important part of heritage conservation and speckle pattern interferometry is a common technique for inspecting surface and internal defects. A speckle pattern interferometry coupled with pulsed laser system for non-destructive detection and prediction of different size cracks is introduced and tested. According to photoacoustic effect, ultrasonic waves are generated by pumping a pulsed laser beam to the rear surface of the sample. The ultrasonic waves serve as carrier propagating from the rear surface to the front, thus conveying deformation and crack size information. For obtaining information about simulated crack size, the front surface is detected by a speckle pattern interferometry system. And simultaneously, the generated ultrasound waves are detected by air-coupled transducer. In this study, the introduced system and method were validated by detecting medium density fiberboards with simulated cracks of different width and depth. Differentiated speckle pattern and ultrasound signals are compared and combined to indicate crack presence and to figure out different crack size qualitatively.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yaowen Zhu, Zhenkai Chen, Wenjing Zhou, and Yingjie Yu "Speckle pattern interferometry excited by pulsed laser for crack size detection", Proc. SPIE 13069, International Conference on Optical and Photonic Engineering (icOPEN 2023), 1306913 (15 February 2024); https://doi.org/10.1117/12.3023147

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KEYWORDS

Speckle pattern

Laser interferometry

Pulsed laser operation

Photoacoustic spectroscopy

Speckle interferometry

Laser frequency

Ultrasonography

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