Numerical investigation of unidirectional generation of circumferential SH waves applied to defect detection in pipe

Lucas M. Martinho, Alan C. Kubrusly, Lei Kang, Jean Pierre Von Der Weid, Steve Dixon

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Abstract

Circumferential Shear horizontal (CSH) ultrasonic guided waves are useful for non-destructive evaluation of pipes. SH waves can be efficiently generated using a periodic permanent magnet electromagnetic acoustic transducer (PPM EMAT). Those transducers generate waves that propagate in both clockwise and counterclockwise directions, which complicates the interpretation of the received signal since the scattered waves from a potential defect can mix with direct waves generated by the transmitter. We recently presented designs of dual-PPM EMATs that generate SH waves in a single direction. In this paper, we investigate through finite element simulations how unidirectional generation can ease the signal interpretation task for the higher-order CSH1 wave mode. Results show that, due to the mode conversion and dispersion, several wavefronts can be detected, under conventional bidirectional generation, rendering signal interpretation and defect echo identification complicated, for a range of defect positions. Unidirectional generation of CSH waves proves itself to be an important feature in pipeline inspection, providing more reliable signal interpretation.

Original languageEnglish
Title of host publicationIUS 2022 - IEEE International Ultrasonics Symposium
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781665466578
ISBN (Print)9781665478137
DOIs
Publication statusPublished - 1 Dec 2022
Event2022 IEEE International Ultrasonics Symposium - Venice, Italy
Duration: 10 Oct 202213 Oct 2022

Publication series

NameIEEE International Ultrasonics Symposium, IUS
Volume2022-October
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Conference

Conference2022 IEEE International Ultrasonics Symposium
Abbreviated titleIUS 2022
Country/TerritoryItaly
CityVenice
Period10/10/2213/10/22

Keywords

  • CSH waves
  • mode-conversion
  • pipe inspection
  • unidirectional generation

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