| Project/Area Number |
11555107
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Measurement engineering
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| Research Institution | YAMAGATA UNIVERSITY |
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Principal Investigator |
TAMURA Yasutaka Yamagata University, Faculty of Engineering, Professor, 工学部, 教授 (40171904)
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| Co-Investigator(Kenkyū-buntansha) |
YUASA Tetsuya Yamagata University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30240146)
AKATSUKA Takao Yamagata University, Faculty of Engineering, Professor, 工学部, 教授 (80091875)
KOYAMA Kiyohito Yamagata University, Faculty of Engineering, Professor, 工学部, 教授 (60007218)
ISHIHARA Chiaki Akishima Laboratories (Mitsui Zosen), Chief Researcher, 情報エンジニアリング事業部, 主任研究
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2000: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1999: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Ultrasound GT / Investigartion of historic relics / Echo waves / Piezoelectric polymer films |
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| Research Abstract |
In the research, we propose an ultrasonic computed-tomography (CT) system for field works. The main purpose of the system is visualization of the internal structure of historic relics such as the wooden pillars of shrines. Using ultrasonic, we realized a safe and portable measuring system. However, there occur some problems in the application of ultrasonic to CT. The ultrasonic wavelength is considerably longer than X-ray wavelength, and, the propagation speed varies over a wide range. Hence, the ultrasonic wave properties significantly affect the CT images. Furthermore, the visualization process is also affected by outer shapes of objects and available acoustic paths.
We have developed an ultrasonic TOP CT system which utilize data obtained by various sensors such as 3D position detector. A trial data acquisition for acoustical transducer array was constructed. The system consists of flexible modules connected each other with a serial buss. A 64ch digital pattern generator and array of switching amplifiers are available. The amplifiers are directly controlled by digital pattern signal. The output range is 2 Vpp to lOOVpp. The switching frequency range is 1KHz to 10MHz. Receivers are constructed with P(VDF-TrFE) copolymer films. A note-book type PC controlls the data acquisition system and a 3D position detector. The system is based on TOF-CT (Time-Of- Flight CT) method with FBP (Filtered Back Projection) algorithm. As an alternative visualization mode, the system can utilize reflected ultrasound echoes using "Hologram-Matrix method". The results of simulation and experiments indicated the availability of the system.
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