Optimization of applied magnetic field methods for various shape defects by eddy current testing using magneto resistive sensor

Takumi Kobara, Yuto Goda, Hiroto Shobu, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada

Research output: Contribution to conferencePaperpeer-review

Abstract

In this study, we investigated the optimization of applied magnetic field methods for defect detection for various shapes of defects made of magnetic and non-magnetic materials using the eddy current testing with a highly sensitive magnetic sensor. From the experiment and simulation results, it was found that the change of the magnetic field distribution caused by the eddy current increased when the sensor was placed directly above the induction coil of the wire-type method. Moreover, in the solenoid coil system, it was found that the detection sensitivity increased when the magnetic sensor was placed close to one side of the coil compared to that placed at the center. In addition, it was found that the signal change was different in the electromagnetic characteristics of the measurement sample. For the non-magnetic material, as the frequency increased, the signal to noise ratio (SNR) of the detected defect signal increased because the signal was generated from only the eddy current. On the other hand, for the magnetic material, there was an optimum frequency for detecting the defect because the signal was generated due to both the magnetization and the eddy current. As a results, the optimum applying method of magnetic field for the eddy current testing using magnetic sensor was clarified.

Original languageEnglish
Publication statusPublished - 2019
Event10th International Workshop NDT in Progress 2019 - Prague, Czech Republic
Duration: Oct 7 2019Oct 9 2019

Conference

Conference10th International Workshop NDT in Progress 2019
CountryCzech Republic
CityPrague
Period10/7/1910/9/19

Keywords

  • Eddy current testing
  • Magnetic material
  • Magneto resistive sensor
  • Non-magnetic material
  • Nondestructive testing

ASJC Scopus subject areas

  • Modelling and Simulation
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Computer Science Applications
  • Safety, Risk, Reliability and Quality

Fingerprint Dive into the research topics of 'Optimization of applied magnetic field methods for various shape defects by eddy current testing using magneto resistive sensor'. Together they form a unique fingerprint.

Cite this