2016 Fiscal Year Final Research Report
Low-Frequency Nonlinear Ultrasonic Imaging Method for Crack Evaluation in Concrete Structures
| Project/Area Number |
26630340
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 非破壊検査 / 非線形超音波 / コンクリート / き裂 / フェーズドアレイ / 欠陥検出 |
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| Outline of Final Research Achievements |
Aging infrastructure has been inspected to ensure the safety and reliability, where most infrastructure has been made of concrete. However, it is difficult to inspect such concrete structures by ultrasonics with MHz because it is generally highly attenuative and heterogeneous. In this study, we developed the fundamental techniques to realize low-frequency nonlinear ultrasonic imaging method for the inspection of aging concrete structures. First, we constructed an imaging system that uses contact-type transmitter with a wedge and the laser scanning receiving array. It was demonstrated in the metal and concrete specimens. Furthermore, we fabricated a high-output low-frequency transducers and made a user-friendly imaging program.
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| Free Research Field |
非破壊検査
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