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Ultrasonic defect characterisation-Use of amplitude, phase, and frequency information

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)349-360
Number of pages12
JournalJournal of the Acoustical Society of America
Issue number1
Early online date23 Jan 2018
DateAccepted/In press - 22 Dec 2017
DateE-pub ahead of print - 23 Jan 2018
DatePublished (current) - Jan 2018


This paper studies ultrasonic defect characterisation with the aim of reducing the characterisation uncertainty. Ultrasonic array data contain a mixture of responses from all reflecting features, and the scattering matrix for each defect can be extracted in post-processing, which describes how ultrasonic waves at a given incident angle are scattered by a defect. In this paper, it is shown that defect characterisation performance can be improved by the inclusion of phase and frequency information relative to current single-frequency-amplitude approaches. This superior characterisation performance is due to the increased number of informative principal components (PCs) and higher signal-to-noise ratios in the PC directions. Scattering matrix phase measurement is very sensitive to localisation errors, and an effective approach is proposed, which can be used to reliably extract phase from experimental data. Nine elliptical defects having different aspect ratios and orientation angles are characterised experimentally. The complex multi-frequency defect database has achieved up to 90.60% reduction in the quantified sizing uncertainty compared to the results obtained using only the amplitude at a single frequency.

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