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Evaluation of inversion approaches for guided wave thickness mapping
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![]() | Accepted version | 1.32 MB | Adobe PDF | View/Open |
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 |