Defect detection using ultrasonic arrays: the multi-mode total focusing method

Jie Zhang, Bruce W. Drinkwater, Paul D. Wilcox, Alan J. Hunter

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

Ultrasonic arrays allow a given scatterer to be illuminated from a wide range of angles and hence are capable of extracting significant information about the scatterer. In this paper a general imaging methodology, termed multi-mode total focusing method, is proposed in which any combination of modes and reflections can be used to produce an image of the test structure. Like the total focusing method, this approach is implemented by post-processing the full matrix of array data to achieve a synthetic focus at every pixel in the image. A hybrid model is used to predict the array data and demonstrate the performance of the multi-mode imaging concept. This hybrid model combines far field scattering coefficient matrices with a ray-based wave propagation model. This allows the inclusion of longitudinal waves, shear waves and wave mode conversions. It is shown that, with prior knowledge of likely scatterer location and orientation, the mode combination and array location can be optimised to maximise the performance of array inspections. A practically relevant weld inspection application is then described and its optimisation is discussed.
Original languageEnglish
Pages (from-to)123-133
JournalNDT and E International
Volume43
Issue number2
DOIs
Publication statusPublished - Mar 2010

Fingerprint Dive into the research topics of 'Defect detection using ultrasonic arrays: the multi-mode total focusing method'. Together they form a unique fingerprint.

  • Cite this