| Presentation | 2018-02-19 Study on non-contact acoustic inspection method using airborne sound wave Kazuko Sugimoto, Tsuneyoshi Sugimoto, Noriyuki Utagawa, Chitose Kuroda, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A non-contact acoustic inspection method was investigated to measure from 5-33 m away and detect internal defects (up to 10 cm in depth) of concrete structures using a long range acoustic device and a laser Doppler vibrometer. An algorithm has proposed to detect internal defects of concrete by combining two acoustic features, vibration energy ratio and spectral entropy obtained by our measurement. However, in an actual concrete structure, it is difficult to distinguish a boundary between a healthy part and a defective part due to influences such as shape of internal defect, aged deterioration and surface condition of concrete. Therefore, we propose a method to statistically evaluate the distribution of healthy part of concrete and extract a healthy part and identify a defective part. In this study, we investigated a case that vibration energy due to the defect is not so different as to the vibration energy of a healthy part of concrete. Using healthy part extraction algorithm for concrete, a healthy part of concrete was identified and evaluated statistically. Applying this algorithm to a circular peeling defect, a defective part was separated from a healthy part and defect was visualized well. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Non-contact acoustic inspection method / Defect detection algorithm / Vibration energy ratio / Spectral entropy / Tone burst wave / Statistical evaluation of healthy part of concrete |
| Paper # | US2017-113 |
| Date of Issue | 2018-02-12 (US) |
| Conference Information | |
| Committee | US |
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| Conference Date | 2018/2/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Minoru Kurosawa(Tokyo Inst. of Tech.) |
| Vice Chair | Nobuyuki Endoh(Kanagawa Univ.) / Shinichi Takeuchi(Toin Univ. of Yokohama) |
| Secretary | Nobuyuki Endoh(Univ. of Toyama) / Shinichi Takeuchi(Univ. of Tokyo) |
| Assistant | Takenobu Tsuchiya(Kanagawa Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study on non-contact acoustic inspection method using airborne sound wave |
| Sub Title (in English) | Defect detection and visualization by statistical evaluation of a healthy part of concrete |
| Keyword(1) | Non-contact acoustic inspection method |
| Keyword(2) | Defect detection algorithm |
| Keyword(3) | Vibration energy ratio |
| Keyword(4) | Spectral entropy |
| Keyword(5) | Tone burst wave |
| Keyword(6) | Statistical evaluation of healthy part of concrete |
| 1st Author's Name | Kazuko Sugimoto |
| 1st Author's Affiliation | Toin University of Yokohama(Toin univ. of Yokohama) |
| 2nd Author's Name | Tsuneyoshi Sugimoto |
| 2nd Author's Affiliation | Toin University of Yokohama(Toin univ. of Yokohama) |
| 3rd Author's Name | Noriyuki Utagawa |
| 3rd Author's Affiliation | SatoKogyo Co., Ltd.(SatoKogyo) |
| 4th Author's Name | Chitose Kuroda |
| 4th Author's Affiliation | SatoKogyo Co., Ltd.(SatoKogyo) |
| Date | 2018-02-19 |
| Paper # | US2017-113 |
| Volume (vol) | vol.117 |
| Number (no) | US-441 |
| Page | pp.pp.7-12(US), |
| #Pages | 6 |
| Date of Issue | 2018-02-12 (US) |