| Presentation | 2007/2/21 Cross Sectional Sound Speed Image of the Timber USing Acoustic Tomographic Method : Evaluation of Sound Speed Anisotropy Caused by the Annual Ring Tamiko KASHIMA, Tomoyuki SARUTA, Akira YAMADA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Aiming at the nondestructive testing of the living trees to detect the existence and degree of the decay, tomographic reconstructions of the wood cross-sectional sound speed image were investigated by using acoustic travel time data acquired at the circumference of the timbers. Based on the straight ray propagation model, smoothed path algebraic reconstruction technique (ART) was introduced which made it possible to reconstruct the image from the several tens of small number of path data. In particular, analytical method for the sound speed anisotropy caused by the annual ring was presented, furthermore, the tomographic algorithm including the anisotropic characteristics was demonstrated. Test examinations were made using the 445 mm diameter Japanese cedar specimen having an artificial decay region. Wideband piezoelectric transducers with the bandwidth in several tens kHz range were used. As a result of image reconstruction using 56 observation path data, precision of the reconstructed sound speed value in decay region was satisfactory without the damage caused by the sound speed anisotropy of the wood. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | decay testing in living trees / travel time acoustic tomography / wood cross sectional sound seed tomography / ultrasonic nondestructive inspection |
| Paper # | US2006-115 |
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| Conference Information | |
| Committee | US |
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| Conference Date | 2007/2/21(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Ultrasonics (US) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Cross Sectional Sound Speed Image of the Timber USing Acoustic Tomographic Method : Evaluation of Sound Speed Anisotropy Caused by the Annual Ring |
| Sub Title (in English) | |
| Keyword(1) | decay testing in living trees |
| Keyword(2) | travel time acoustic tomography |
| Keyword(3) | wood cross sectional sound seed tomography |
| Keyword(4) | ultrasonic nondestructive inspection |
| 1st Author's Name | Tamiko KASHIMA |
| 1st Author's Affiliation | Grad. Sch. Bioapplicat. & Syst. Engineering, Tokyo University of Agriculture & Technology() |
| 2nd Author's Name | Tomoyuki SARUTA |
| 2nd Author's Affiliation | Grad. Sch. Bioapplicat. & Syst. Engineering, Tokyo University of Agriculture & Technology |
| 3rd Author's Name | Akira YAMADA |
| 3rd Author's Affiliation | Grad. Sch. Bioapplicat. & Syst. Engineering, Tokyo University of Agriculture & Technology |
| Date | 2007/2/21 |
| Paper # | US2006-115 |
| Volume (vol) | vol.106 |
| Number (no) | 543 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |