Laser-induced ultrasonic measurements for the detection and reconstruction of surface defects

Acta Acustica

Xing Guangzhen¹  Yang Ping¹  Zou Limin²  Qian Feiming²  Hu Pengcheng²  Koukoulas Triantafillos³ 

[1] Division of Mechanics and Acoustics, National Institute of Metrology;Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology;Metrology Research Centre, Mass and Related Quantities Team, Acoustics, Ultrasound and Vibration Metrology, National Research Council Canada;

关键词: laser-induced ultrasound;    surface defects detection;    full matrix capture;    total focusing method;   

DOI  :  10.1051/aacus/2021031

来源: DOAJ

【 摘 要 】

Laser-induced ultrasonic measurement is a non-contact non-destructive technology that can be employed for the testing and assessment of surface defects. In order to improve the correct identification of defects, the full matrix capture (FMC) and total focusing method (TFM) are applied on the imaging process. FMC data includes A-scans resulting from the combination of all measurement axes defined by the sequential generation and detection of utilized laser beams in the system. In this paper, an aluminium block with four holes whose diameters range from 1 mm to 2.5 mm is assessed through B-scans, the synthetic aperture focusing technique (SAFT) and FMC/TFM. The results demonstrate that the FMC/TFM technology can significantly improve the imaging quality and signal-to-noise ratio (SNR). In addition, this method has higher lateral resolution and larger imaging range compared with traditional B-scans.

【 授权许可】

Unknown