Structural damage identification based on laser ultrasonic propagation imaging technology

Chen-Ciang Chia; Si-Gwang Jang; Jung-Ryul Lee; Dong-Jin Yoon

doi:10.1117/12.827241

17 June 2009 Structural damage identification based on laser ultrasonic propagation imaging technology

Chen-Ciang Chia, Si-Gwang Jang, Jung-Ryul Lee, Dong-Jin Yoon

Proceedings Volume 7389, Optical Measurement Systems for Industrial Inspection VI; 73891S (2009) https://doi.org/10.1117/12.827241
Event: SPIE Europe Optical Metrology, 2009, Munich, Germany

Abstract

An ultrasonic propagation imaging (UPI) system consisted of a Q-switched Nd-YAG pulsed laser and a galvanometer laser mirror scanner was developed. The system which requires neither reference data nor fixed focal length could be used for health monitoring of curved structures. If combined with a fiber acoustic wave PZT (FAWPZT) sensor, it could be used to inspect hot target structures that present formidable challenges to the usage of contact piezoelectric transducers mainly due to the operating temperature limitation of transducers and debonding problem due to the mismatch of coefficient of thermal expansion between the target, transducer and bonding material. The inspection of a stainless steel plate with a curvature radius of about 4 m, having 2mm×1mm open-crack was demonstrated at 150°C using a FAWPZT sensor welded on the plate. Highly-curved surfaces scanning capability and adaptivity of the system for large laser incident angle up to 70° was demonstrated on a stainless steel cylinder with 2mm×1mm open-crack. The imaging results were presented in ultrasonic propagation movie which was a moving wavefield emerged from an installed ultrasonic sensor. Damages were localized by the scattering wavefields. The result images enabled easy detection and interpretation of structural defects as anomalies during ultrasonic wave propagation.

Citation Download Citation

Chen-Ciang Chia, Si-Gwang Jang, Jung-Ryul Lee, and Dong-Jin Yoon "Structural damage identification based on laser ultrasonic propagation imaging technology", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 73891S (17 June 2009); https://doi.org/10.1117/12.827241

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available