Identification of a Flaw Using Electromagnetic Acoustic Transducers: Quantification Based on an Approach of Inverse Analysis

Shinichi Maruyama, Toshihiko Sugiura, Akihiro Inoue, Masatsugu Yoshizawa

Research output: Contribution to journalArticle


Electromagnetic acoustic transducers (EMATs) can transmit and detect ultrasonic waves in a conductive specimen out of any contact with it. This process can be given theoretical modeling and formulation based on elastodynamics and electromagnetics. It suggests the possibility of quantitative nondestructive evaluation using EMATs. This research deals with a numerical method of flaw identification from a receiver signal obtained by EMATs. Experimental results of receiver signals agree well with numerical ones, which verified the mathematical model of the inspection process. Flaw identification is formulated as a problem of parameter optimization. To avoid being trapped in a local optimum, initial parameters were successfully evaluated from the height and the time period of peaks in the receiver signals. Flaw parameters were identified from receiver signals obtained from numerical simulations and experiments, which verified the method of flaw identification presented here.

Original languageEnglish
Pages (from-to)3445-3453
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number663
Publication statusPublished - 2001



  • Electromagnetic Acoustic Transducer (EMAT)
  • Electromagnetic Induced Vibration
  • Finite Element Method
  • Identification
  • Inverse Problem
  • Nondestructive Inspection
  • Super Sonic Wave

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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