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| Presentation | 2021-02-22 15:45 Study on normalized spectral entropy in defect detection of noncontact acoustic inspection Kazuko Sugimoto, Tsuneyoshi Sugimoto (Toin Univ. of Yokohama)  US2020-72 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Noncontact acoustic inspection method is a non-contact non-destructive manner for remotely detecting and visualizing internal defects in composite materials such as concrete. The target surface is vibrated with sound waves, and data analysis is performed from the two-dimensional vibration velocity distribution measurement with a laser Doppler vibrometer. In order to detect internal defects, we have proposed a method for distinguishing between a healthy part and a defective part using vibrational energy ratio and spectral entropy. However, spectral entropy used in the past is not an absolute value but a relative value, and although it shows the same value under the same measurement conditions, there is a problem that it cannot be directly compared with the values under different measurement conditions. Therefore, we introduced normalized spectral entropy and examined the application condition so that a value can be compared the other in a different measurement condition. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Noncontact acoustic inspection / Internal defect detect / NDT / Normalized spectral entropy / laser Doppler vibrometer / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 120, no. 377, US2020-72, pp. 29-34, Feb. 2021. | |
| Paper # | US2020-72 | |
| Date of Issue | 2021-02-15 (US) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | US2020-72 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2021-02-22 - 2021-02-22 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | US |
| Conference Code | 2021-02-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study on normalized spectral entropy in defect detection of noncontact acoustic inspection |
| Sub Title (in English) | |
| Keyword(1) | Noncontact acoustic inspection |
| Keyword(2) | Internal defect detect |
| Keyword(3) | NDT |
| Keyword(4) | Normalized spectral entropy |
| Keyword(5) | laser Doppler vibrometer |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 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) |
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| Speaker | Author-1 |
| Date Time | 2021-02-22 15:45:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2020-72 |
| Volume (vol) | vol.120 |
| Number (no) | no.377 |
| Page | pp.29-34 |
| #Pages | 6 |
| Date of Issue | 2021-02-15 (US) |
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