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Evaluation of inversion approaches for guided wave thickness mapping

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Title: Evaluation of inversion approaches for guided wave thickness mapping
Authors: Huthwaite, P
Item Type: Journal Article
Abstract: Accurate inversion is vital for quantitative imaging, including ultrasonic guided wave tomography, where thickness maps of plate-like structures are reconstructed to quantify corrosion damage. The dispersive properties of guided waves are often exploited to enable thickness maps to be produced from wave speed reconstructions. Ray tomography, diffraction tomography and a hybrid algorithm combining their features were investigated to reconstruct wave speed. Test data produced from simple defects of different sizes using a realistic full elastic guided wave model and the equivalent idealized acoustic model were passed to the imaging algorithms, generating wave speed maps, and, from these, thickness maps. For both datasets, ray tomography exhibited poor resolution. Diffraction tomography performed better, but was limited to shallow, small defects. The hybrid algorithm achieved the best results, giving a resolution around 1.5–2 wavelengths from the realistic test data compared to half wavelength from the idealized case. These results were validated with experimental data, and also extended to a realistic corrosion patch confirming the trends demonstrated with simple defects. The resolution loss with realistic data compared with idealized data indicates the acoustic model cannot accurately capture guided wave scattering and an alternative approach is necessary for better resolution reconstructions.
Issue Date: 8-Jun-2014
Date of Acceptance: 3-Mar-2014
URI: http://hdl.handle.net/10044/1/28159
DOI: 10.1098/rspa.2014.0063
ISSN: 1364-5021
Publisher: The Royal Society
Start Page: 1
End Page: 28
Journal / Book Title: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume: 470
Issue: 2166
Copyright Statement: © 2014 The Author(s) Published by the Royal Society. All rights reserved
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
MULTIDISCIPLINARY SCIENCES
ultrasound tomography
guided waves
inversion
thickness mapping
TRAVEL-TIME TOMOGRAPHY
DIFFRACTION TOMOGRAPHY
GENETIC ALGORITHM
RAY TOMOGRAPHY
PICKING
PROPAGATION
RECORDINGS
SCATTERING
REFRACTION
LIMITS
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
ultrasound tomography
guided waves
inversion
thickness mapping
DIFFRACTION TOMOGRAPHY
GENETIC ALGORITHM
PROPAGATION
SCATTERING
REFRACTION
PICKING
LIMITS
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published
Article Number: 20140063
Online Publication Date: 2014-06-08
Appears in Collections:Mechanical Engineering
Faculty of Engineering