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

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