The effect of distortion models on characterisation of real defects using ultrasonic arrays

Long Bai, Alexander Velichko, Adam T. Clare, Paul Dryburgh, Don Pieris, Bruce W Drinkwater

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
58 Downloads (Pure)


Characterisation of real defects is one of the main challenges in ultrasonic non-destructive testing (NDT), especially for small defects having irregular shapes. Traditional methods such as ultrasonic array imaging are limited by the image resolution, and in this paper, we consider using the scattering matrix which is extractable from the full matrix of transmit–receive array data. We describe a procedure in which the experimental measurements are used to perform characterisation and reveal the associated uncertainties. Moreover, we explore the performance of this characterisation procedure and propose a robust defect characterisation approach. The performance of the proposed approach is studied experimentally, and the sizing errors are small (within 0.09 or 0.23mm for fatigue cracks at 2.5 MHz, and within 0.38 or 0.24mm for volumetric defects in an additive manufactured specimen at 10 MHz). In addition, reliable estimation of defect angle/width is achieved.
Original languageEnglish
Article number102263
JournalNDT and E International
Early online date30 Mar 2020
Publication statusPublished - 1 Jul 2020


  • Ultrasonic array
  • defect characterisation
  • scattering matrix
  • distortion model


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