| Project/Area Number |
10650069
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
MINKOV DORIAN Graduate School of Engineering, Tohoku University, Associate Professor, 大学院・工学研究科, 助教授 (30291264)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Mikiko Graduate School of Engineering, Tohoku University, Assistant Professor, 大学院・工学研究科, 講師 (80005488)
SHOJI Tetsuo Graduate School of Engineering, Tohoku University, Professor, 大学院・工学研究科, 教授 (80091700)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Magneto-optical sensor / Remote sensing / Ferromagnetic material / Paramagnetic material / Leakage Magnetic Field / Faraday effect / Nondestructive inspection / Magnetic testing |
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| Research Abstract |
Detection and sizing of defects are a main subject of plant life management based on fracture mechanics. Unfortunately, the performance of currently available nondestructive inspection techniques is not sufficient in terms of detection sensitivity, quantitative evaluation and handiness. Correspondingly, development of a new nondestructive testing and evaluation technique based on magneto-optical sensor is reported in this study.
A new remote sensing system using the magneto-optical method is developed for inspection of flaws introduced during service operation where routine inspection is difficult because of difficult inaccessibility to the components. Among the advantages of non-destructive inspection (NDI) based on the magneto-optical sensor are : real time inspection, elimination of electrical noise and high spatial resolution. Remote sensing of flaws is achieved using the basic principles of Faraday effect, optical permeability and diffraction of a laser by the domain wall.
A novel remote NDI system using the principle of optics and Leakage Magnetic Field (LMF) is described in this study. The main characteristic of the system is that image data and LMF information can be obtained simultaneously. It is possible to carry out remote and high speed inspection of cracks from the intensity of the reflected light, and to estimate the size of a crack effectively with their diverse data. The advantages of this NDI system are demonstrated using many kinds of specimens.
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