Title :
A Modified LTI ray tracing algorithm in Lamb wave tomography
Author :
Zhang, Haiyan ; Sun, Xiuli ; Qi, Xuerui ; Liu, Qianwei
Author_Institution :
Sch. of Commun. & Inf. Eng., Shanghai Univ., Shanghai
Abstract :
Based on the analysis and comparison among existing ray tracing methods, a new modified linear traveltime interpolation (LTI) method is proposed in this paper. The developed method remains the virtue of LTI but is more precise than the original LTI. By analyzing the forward modeling and inversion process of the LTI algorithm, the backward ray tracing LTI algorithm is adopted. It can keep ray tracing from local minimum by computing the velocity of grid nodes in advance. Compared with original LTI, the new algorithm is able to compute the shortest ray path. Tomography based on the improved LTI traveltime data can reflect the size and property of the defect with high resolving power. The developed ray tracing technique for Lamb wave quantitative nondestructive evaluation is of great significance in both theory and practice.
Keywords :
interpolation; nondestructive testing; ray tracing; surface acoustic waves; Lamb wave tomography; backward ray tracing LTI algorithm; forward modeling; inversion process; modified LTI ray tracing algorithm; modified linear traveltime interpolation method; shortest ray path; Algorithm design and analysis; Computed tomography; Diffraction; Grid computing; Inspection; Interpolation; Military aircraft; Optical scattering; Ray tracing; Seismic waves;
Conference_Titel :
Audio, Language and Image Processing, 2008. ICALIP 2008. International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-1723-0
Electronic_ISBN :
978-1-4244-1724-7
DOI :
10.1109/ICALIP.2008.4590287
