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Proceedings Paper

Laser excitation and fully non-contact sensing ultrasonic propagation imaging system for damage evaluation
Author(s): Dipesh Dhital; Jung Ryul Lee; Chan Yik Park; Eric Flynn
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Paper Abstract

Various types of damages occur in aerospace, mechanical and many other engineering structures, and a reliable nondestructive evaluation technique is essential to detect any possible damage at the initiation phase. Ultrasound has been widely used but the conventional contact ultrasonic inspection techniques are not suitable for mass and couplant sensitive structures and are relatively slow. This study presents a fully non-contact hybrid laser ultrasonic generation and piezoelectric air-coupled transducer (ACT)/laser Doppler vibrometer (LDV) sensing technique combined with ultrasonic wave propagation imaging (UWPI), ultrasonic spectral imaging (USI) and wavelet-transformed ultrasonic propagation imaging (WUPI) algorithms to extract defect-sensitive features aimed at performing a thorough diagnosis of damage. Optimization enables improved performance efficiency of ACT and LDV to be used as receivers for non-contact hybrid laser ultrasonic propagation imaging (UPI) system as shown from the experimental results in this study. Real fatigue closed surface micro crack on metal structure was detected using hybrid laser ultrasonic generation/ACT sensing system, with size detection accuracy as high as 96%. Impact damages on carbon fiber reinforced plastic composite wing-box specimen were detected and localized using hybrid laser ultrasonic generation/LDV sensing system.

Paper Details

Date Published: 29 March 2012
PDF: 14 pages
Proc. SPIE 8343, Industrial and Commercial Applications of Smart Structures Technologies 2012, 83430D (29 March 2012); doi: 10.1117/12.917387
Show Author Affiliations
Dipesh Dhital, Chonbuk National Univ. (Korea, Republic of)
Jung Ryul Lee, Chonbuk National Univ. (Korea, Republic of)
Chan Yik Park, Agency for Defense Development (Korea, Republic of)
Eric Flynn, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 8343:
Industrial and Commercial Applications of Smart Structures Technologies 2012
Kevin Farinholt; Steven F. Griffin, Editor(s)

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