The excitation and detection of Lamb waves with planar coil electromagnetic acoustic transducers

PD Wilcox, MJS Lowe, P Cawley

Research output: Contribution to journalArticle (Academic Journal)

74 Citations (Scopus)

Abstract

Planar coil electromagnetic acoustic transducers (EMATs) are investigated for the excitation and detection of Lamb waves in nonferromagnetic metallic waveguides. Such EMATs are attractive for certain applications due to their omni-directional sensitivity to wave modes with predominantly in-plane surface displacement, such as the S/sub o/ Lamb wave mode. A model is developed that enables the modal content of the radiated Lamb wave field from a transmitting EMAT to be calculated, and the output voltage from a receiving EMAT to be predicted when a Lamb wave mode is incident on it. The predictions from this model are compared with experimental data obtained from 12 different EMATs tested on a 5-mm thick aluminum plate, and good agreement is obtained. The model then is used to analyze the different effects that contribute to the overall Lamb wave modal sensitivity of an EMAT. The relationship between coil geometry and wavelength is examined.
Translated title of the contributionThe excitation and detection of Lamb waves with planar coil electromagnetic acoustic transducers
Original languageEnglish
Pages (from-to)2370 - 2383
Number of pages14
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume52 (12)
DOIs
Publication statusPublished - Dec 2005

Bibliographical note

Publisher: IEEE

Fingerprint Dive into the research topics of 'The excitation and detection of Lamb waves with planar coil electromagnetic acoustic transducers'. Together they form a unique fingerprint.

  • Cite this