2013 Fiscal Year Final Research Report
Acoustic image technology of the inside inspection of concrete structure devoid of substance and pouring concrete into formwork
| Project/Area Number |
23241050
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Social systems engineering/Safety system
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ASADA Akira 東京大学, 生産技術研究所, 教授 (60323648)
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| Co-Investigator(Kenkyū-buntansha) |
MAEDA Fumitaka 東京大学, 生産技術研究所, 特任助教 (80559930)
AKIMOTO Kazumi 熊本大学, 沿岸域環境科学教育研究センター, 准教授 (70222536)
IGARASSHI Tadashi 土木研究所, 寒地土木研究所, 研究員 (00533415)
KISHI Hirohito 土木研究所, 寒地土木研究所, 研究員 (10588338)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | パラメトリックソーナー / 港湾岸壁 / ピエゾコンポジット / フォーカスアレイ / フレネルレンズ |
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| Research Abstract |
A lot of accident examples that the collapse of the harbor quay or top surface
cave-in brought about have been reported by aged deterioration.Therefore, the parametric sonar system which diagnosed the quay inside has been developed. We designed the new transducer by the piezocomposite manufacturing method to improve the secondary wave generation efficiency of the parametric sonar and power amp, the transmission and reception control system. For parametric sonar SES2000 of sub-bottom profiler, the Fresnel lens which could focus it in a short distance was designed and produced. We equipped SES2000 with the lens and evaluated it with a quay and a water tank and examined it and got a good measurement result. New technique to measure a shape of the quay surface with an acoustic video camera precisely was developed also.
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