Modeling of characteristics of magneto-optical sensor using FEM and dipole model for nondestructive evaluation

Ji Nyi Lee, Ji Seong Hwang, Tetsuo Shoji, Jae Kyu Lim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The magneto-optical nondestructive inspection system (hereafter refer to as RMO system) using magneto-optical sensor (hereafter refer to as MO sensor) offers the benefits of providing image data and LMF information at the same time. Therefore this system makes it possible to carry out remote and high speed inspection of cracks from the intensity of the reflected light and to estimate the shape of a crack more effectively than by already existing methods. In other words, the shape of crack could be evaluated using image data, and crack depth can be determined by calculating the intensity of reflected light. The purposes of this study were to confirm the vertical components of leakage magnetic flux from a crack using RMO system and to verify the effects of MO sensor using the finite element method and dipole model calculation. The effectiveness of these analysis methods was compared with experiments using a RMO system and several types and sizes of the crack on plate specimens. The volume of a crack could be estimated using the optical intensity regardless of the shape of cracks.

Original languageEnglish
Pages (from-to)2022-2027
Number of pages6
JournalKey Engineering Materials
Volume297-300 III
Publication statusPublished - 2005
Externally publishedYes


  • Dipole model
  • Faraday effect
  • Finite element method
  • Magnetic domain
  • Magneto-optical method
  • Nondestructive evaluation
  • Remote sensing

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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