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Vol.2 No.4 previous GA 16 - AA 30 - SP5 ( 31 - 32 - 33 )- NT 33 - 34 - 35next Vol.3 No.2
Academic Articles
Regular Paper (Invited) Vol.3, No.1 (2011) p.25 - p.38
 

A Simulation Technique of Non-Destructive Testing using Magneto-Optical Film

 
Huy Minh LE 1Jinyi LEE 2Sehoon LEE3and Tetsuo SHOJI4
 
1, 2 Department of Control, Instrumentation and Robot Engineering, Chosun University, Gwangju, 501-759, Korea.
3 Research Center for Real Time NDT, Chosun University, Gwangju, 501-759, Korea.
4 New Industry Creation Hatchery Center, Tohoku University, Sendai, 980-8579, Japan.
 
Abstract
An electro-magnetic field resulting from the application of a magnetic or electrical field to a metallic specimen is distorted due to the existence of a crack. The distribution of the magnetic field is changed by this distortion of the electro-magnetic field, and this change in the distribution can be visualized by the magneto-optical (MO) film in the magneto-optical nondestructive testing (NDT) method. The plane of a polarized light beam rotates when the beam is transmitted through an MO film because of the Faraday effect, a kind of magneto-optical effect. In this paper, an NDT simulation technique, which uses not only the Faraday effect, but also the change in the magnetic domains caused by an external magnetic field, the saturated magnetization effect, the effect of the magnetizer, the bias of the magnetic field and the temperature properties, is discussed. The simulation results are verified by comparing them to experiment results.
 
Keywords
NDT, Crack, Faraday effect, Magneto-Optics, MO film, Leakage Magnetic Flux.
 
Full Paper: PDF EJAM Vol.2 pp.82-100 "Environmental Fatigue Evaluation in PLM Activities of PWR plant"
Article Information
Article history:
Received 15 December 2010
Accepted 28 April 2011