A computer simulation study of imaging flexural inhomogeneities using plate-wave diffraction tomography

Rohde, A., Veidt, M., Rose, L. R. F. and Homer, J. (2008-03) A computer simulation study of imaging flexural inhomogeneities using plate-wave diffraction tomography. Ultrasonics, 48 1: 6-15.


Author(s) Rohde, A.
Veidt, M.
Rose, L. R. F.
Homer, J.
Title A computer simulation study of imaging flexural inhomogeneities using plate-wave diffraction tomography
Journal name Ultrasonics
Publication date 2008-03
Sub-type Article
Year available 2008
Volume number 48
Issue number 1
ISSN 0041-624X: 1874-9968
Start page 6
End page 15
Total pages 10
Editor(s) W. Sachse
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2009
Language eng
Subject 0913 Mechanical Engineering
8599 Other Energy
CX
Abstract This paper investigates the feasibility of plate-wave diffraction tomography for the reconstruction of flexural inhomogeneities in plates using the results of computer simulation studies. The numerical implementation of the fundamental reconstruction algorithm, which has recently been developed by Wang and Rose [C.H. Wang, L.R.F. Rose, Plate-wave diffraction tomography for structural health monitoring, Rev. Quant. Nondestr. Eval. 22 (2003) 1615–1622] is investigated addressing the essential effects of applying the discrete form of the Fourier diffraction theorem for solving the inverse problem as discussed by Kak and Slaney [A.C. Kak, M. Slaney, Principles of Computerized Tomographic Imaging, IEEE Press, New York, 1988] for the acoustic case, viz. diffraction limited sensitivity, influence of weak scatterer assumption, damage location and scatter field data processing in time and Fourier space as well as experimental limitations such as finite receiver length and limited views. The feasibility of the imaging technique is investigated for cylindrical inhomogeneities of various severities and relative position within the interrogation space and a normal incident interrogation configuration. The results show that plate-wave diffraction tomography enables the quantitative reconstruction of location, size and severity of plate damage with excellent sensitivity and offers the potential for detecting corrosion thinning, disbonds and delamination damage in structural integrity management applications.
Keyword(s) Plate-wave diffraction tomography
Plate-wave scattering
 
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