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Surface reconstruction accuracy using ultrasonic arrays: Application to non-destructive testing

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)26-34
Number of pages9
JournalNDT and E International
Volume96
Early online date12 Mar 2018
DOIs
DateAccepted/In press - 8 Mar 2018
DateE-pub ahead of print - 12 Mar 2018
DatePublished (current) - 1 Jun 2018

Abstract

The accurate non-destructive inspection of engineering structures using ultrasonic immersion imaging requires a precise representation of the surface of the structure. Here we investigate the relationship between surface geometry, surface measurement error using ultrasonic arrays and the total focusing method (TFM) and how this impacts on the ability to image a feature within a component. Surfaces shaped as sinusoids covering combinations of surface wavelengths (0.8 to 32λwater) and amplitudes (0.6 to 9λwater) are studied. The surface reconstruction errors are shown to cause errors in imaging, such as reduced amplitude and blurring of the image of a side-drilled hole. These reconstruction errors are shown to increase rapidly with the maximum gradient of the sinusoid. Sinusoidal surfaces with maximum gradients <45° lead to average surface reconstruction errors <λwater and amplitude imaging errors within 6 dB of the flat-surface case. It is also shown that very poor results are obtained if the surface gradient is excessively steep.

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://www.sciencedirect.com/science/article/pii/S0963869517306941 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 984 KB, PDF-document

    Licence: CC BY-NC-ND

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