Computation of the radiation pattern of unidirectional SH wave generated by dual-PPM EMATs

Lucas M. Martinho, Alan C. Kubrusly, Lei Kang, Steve Dixon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Shear horizontal (SH) guided waves are commonly used in non-destructive evaluation and can be generated by permanent magnet electromagnetic acoustic transducers (PPM EMATs). PPM EMATs generate SH waves that propagate either forwards and backwards. This is often an undesired characteristic. Recently, we presented designs of PPM-like EMATs that generate SH waves in a single direction through the interference mechanism of two independent periodic sources of forces. In this paper, we present a line-source based analytical model to calculate the radiation pattern produced by multi-PPM EMATs and, in particular, by dual-PPM EMATs, which are able to generate SH waves in a single direction. The model was validated by computing the radiation pattern of a unidirectional side-shifted dual-PPM EMAT, showing good agreement with experimental and numerical results.

Original languageEnglish
Title of host publication2021 IEEE International Ultrasonics Symposium (IUS)
PublisherInstitute of Electrical Engineers
Number of pages4
ISBN (Electronic)9781665403559
ISBN (Print)9781665447775
Publication statusPublished - 15 Nov 2021
Event2021 IEEE International Ultrasonics Symposium - Online, China
Duration: 11 Sept 202116 Sept 2021

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727


Conference2021 IEEE International Ultrasonics Symposium
Abbreviated titleIUS 2021


  • dual-PPM EMAT
  • EMAT
  • line sources
  • radiation diagram
  • SH guided waves
  • unidirectional generation


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