Ultrasonic guided wave estimation of minimum remaining wall thickness using Gaussian process regression

Morteza Tabatabaeipour, Konstantinos Tzaferis, Ross McMillan, William Jackson, Gordon Dobie, Rachel S. Edwards, Oksana Trushkevych, Anthony Gachagan

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
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Ultrasonic Guided Waves (UGW) offer the possibility of inspecting a strip across a structure rather than just the point under a traditional bulk wave transducer. This can increase the rate of inspection and enable inspection under obstructions. This paper investigates the instantaneous phase characteristics of the shear horizontal guided waves for various defect depths and widths. The Gaussian process regression is then evaluated for estimating the minimum remaining wall thickness between a pair of transducers. A Gaussian process regression model is built using the fusion of large-scale simulated and low-scale real experimental data. For this purpose, a more precise model of an electromagnetic acoustic transducer is initially built by integrating both electromagnetic and elastic wave fields. Then the simulated data set is built after having been calibrated using a genetic algorithm. The examination of an unseen simulated evaluation data set shows that 96 % of data has an error during thickness gauging of less than 10 per cent of wall thickness. Finally, an experimental testing data set containing three different defects with depths of 3.7, 5.7 and 9.2 mm was examined, resulting in a good depth prediction of large defects with less than 1 mm error for defects wider than one wavelength.
Original languageEnglish
Article number110990
Number of pages13
JournalMaterials & Design
Early online date30 Jul 2022
Publication statusPublished - 30 Sept 2022


  • automated non-destructive evaluation
  • guided waves
  • shear horizontal waves
  • ultrasonics
  • machine learning
  • Gaussian process regression


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