Laser ultrasound technique for ray tracing investigation of Lamb wave tomography

Chia-Han Wu; Che-Hua Yang

doi:10.1117/12.881087

19 April 2011 Laser ultrasound technique for ray tracing investigation of Lamb wave tomography

Chia-Han Wu, Che-Hua Yang

Proceedings Volume 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011; 79833L (2011) https://doi.org/10.1117/12.881087
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

This paper presents a method for Lamb wave tomography utilizing a quantitative laser ultrasound visualization technique. Lamb wave tomography had been made for image restructuring of the defect region information of specimen, including position, size and shape. Previous researches developed existing algorithm to restructure image in Lamb wave tomography. However these restructured algorithms are susceptible to refraction, strong scattering or abrupt change in the thickness and result inaccurate image reconstruction. This paper employs experimental method named offset grid scan for Lamb wave propagating along samples and extracts the group velocity of Lamb wave using π -point phase comparison signal processing. The goal of the offset grid scan in a very short temporal domain presented in this study is to counteract the above problem lead to various errors. In this research, the experimental method with the numerical results is more accurate than previous algorithms.

Citation Download Citation

Chia-Han Wu and Che-Hua Yang "Laser ultrasound technique for ray tracing investigation of Lamb wave tomography", Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 79833L (19 April 2011); https://doi.org/10.1117/12.881087

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