Journal
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
Volume 60, Issue 6, Pages 1165-1177Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2013.2679
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Funding
- Engineering and Physical Sciences Research Council [EP/H045430/1, EP/H040072/1, EP/F017332/1] Funding Source: researchfish
- EPSRC [EP/H045430/1, EP/H040072/1, EP/F017332/1] Funding Source: UKRI
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Guided wave tomography offers a method to accurately quantify wall thickness losses in pipes and vessels caused by corrosion, using ultrasonic waves transmitted over distances of approximately 1 to 2 m, and measured by an array of transducers. These measurements are then used to reconstruct a map of wall thickness throughout the inspected region. To achieve accurate estimations of remnant wall thickness, it is vital that a suitable Lamb mode is chosen. This paper presents a detailed evaluation of the two most suitable modes, S-0 and A(0), to compare their performance using both numerical and experimental data. The sensitivity of A(0) to thickness variations was shown to be superior to S-0; however, the attenuation from A(0) when a liquid loading was present was much higher than S-0. A(0) was less sensitive to the presence of coatings on the surface than was S-0. Finally, it was shown that both modes could achieve a similar level of resolution in the plane of the plate surface.
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