Applications of Electromagnetic Acoustic Testing (EMAT)

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Applications of Magnetism and Magnetic Materials".

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 1526

Special Issue Editor

School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China
Interests: electromagnetic acoustic testing; guided wave; laser ultrasonics; nondestructive evaluation; infrared thermography
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, we have seen the rapid development of electromagnetic acoustic testing (EMAT) techniques and their great success in applications in the fields of nondestructive testing (NDT) and structure health monitoring (SHM) thanks to their non-contact and coupling-free features. However, EMAT techniques still face a significant number of challenges, and new demands from industries are constantly emerging. This Special Issue is therefore dedicated to recent advances in the research and development of new EMAT transducers and systems, as well as to novel and innovative applications of established techniques in the fields of NDT and SHM. Topics of interest include but are not limited to:

  • Electromagnetic acoustic transducers for ultrasonic bulk waves, surface wave, and guided wave;
  • Magnetostrictive patch transducers for ultrasonic bulk waves, surface wave, and guided wave;
  • Sensor networks;
  • EMAT-based NDT&E, SHM, and material characterization.

Dr. Cuixiang Pei
Guest Editor

Manuscript Submission Information

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Keywords

  • electromagnetic acoustic transducers
  • magnetostrictive patch transducers
  • ultrasonic bulk wave
  • surface wave
  • guided wave
  • NDT&E
  • SHM
  • linear and nonlinear ultrasonics
  • material characterization
  • damage inspection

Published Papers (1 paper)

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Research

20 pages, 9863 KiB  
Article
Research on Identification and Detection of Aluminum Plate Thickness Step Change Based on Electromagnetic Acoustic Resonance
by Zhichao Cai, Yihu Sun, Zhengshi Lu and Qixiang Zhao
Magnetochemistry 2023, 9(3), 86; https://doi.org/10.3390/magnetochemistry9030086 - 22 Mar 2023
Viewed by 1052
Abstract
The conventional ultrasonic thickness measurement method is ineffective in detecting the measured specimen with a step change in thickness as it is easy to cause multimode acoustic mixing in the ultrasonic detection process. To solve this problem, this paper presented an electromagnetic acoustic [...] Read more.
The conventional ultrasonic thickness measurement method is ineffective in detecting the measured specimen with a step change in thickness as it is easy to cause multimode acoustic mixing in the ultrasonic detection process. To solve this problem, this paper presented an electromagnetic acoustic resonance (EMAR) moving scan identification method based on a frequency–frequency energy density precipitation (FFEDP) algorithm, which uses a standing wave resonance mode to accurately extract step thickness information and employs the algorithm to separate step thickness information. According to the simulation results, the ratio of the highest energy density of the spectrum signal on both sides of the step area to the total energy density had an opposite linear change rule with the equidistant movement of the transducer coil. The thickness step area can be identified by analyzing the crossover point of the contrast value change. The experimental results showed that the proposed method can accurately extract the thickness information under millimeter-level stepping distance for sector-notched specimens with step surfaces of different thicknesses, and at the same time realize the effective identification of the step surface. Full article
(This article belongs to the Special Issue Applications of Electromagnetic Acoustic Testing (EMAT))
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