| Project/Area Number |
26420382
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Measurement engineering
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| Research Institution | Gunma University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 非接触探傷試験 / 電磁波伝達関数 / 導波管伝搬 / 周波数分散性 / 隅奇モード / 偶奇モード / 伝搬定数 / エバネッセント波 |
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| Outline of Final Research Achievements |
Metallic tubes used in industrial plants may occur in cracks and change in shape owing to external factors and long-term usage. In order to prevent accidents caused by defects in the metallic tubes, various inspection methods have been established. However, these conventional methods require long detection time and effort to inspect the long tubes. In order to avoid this problem, an original method using propagation characteristic of electromagnetic waves is proposed. In the proposed method, metallic tubes are regarded as waveguides, and the defects can be detected by using propagating electromagnetic waves inside the tubes under test. To verify this method, we conducted experiments using a vector network analyzer. As a result, the proposed method is effective for detecting defects such as foreign matter and cracks, and for estimating the location and direction of the cracks. Furthermore, the proposed method is effective even if there is a bend or branch in the metallic tubes.
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