2013 Fiscal Year Final Research Report
Closed-crack imaging method, subharmonic phased array for crack evaluation (SPACE) , for curved surfaces
| Project/Area Number |
24656429
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Material processing/treatments
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| Research Institution | Tohoku University |
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Principal Investigator |
OHARA Yoshikazu 東北大学, 工学(系)研究科(研究院), 助教 (90520875)
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| Co-Investigator(Kenkyū-buntansha) |
YAMANAKA Kazushi 東北大学, 大学院工学研究科, 教授 (00292227)
TSUJI Toshihiro 東北大学, 大学院工学研究科, 助教 (70374965)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 非破壊検査 / 非線形超音波 / フェーズドアレイ / 曲面 / 閉じたき裂 |
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| Research Abstract |
In the field of nondestructive evaluation, "curved surface" and "closed crack" are two big problems that we need to resolve. Thus far we have developed an closed-crack imaging method, subharmonic phased array for crack evaluation (SPACE). In this study, we propose a new imaging method by combining SPACE and state-of-the-art array transducer, flexible array transducer, which can conform a curved surface. First we formulated an imaging algorithm under a consideration of curvature. We designed and fabricated the flexible array transducer. Furthermore, we measured the sound field due to the flexible array transducer by utilizing the scanning laser interferometer. Thus we demonstrated the fundamental performance of SPACE which can be applied to an arbitrary curved surface.
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