| Project/Area Number |
09450040
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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 | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | TOKYO METROPOLITAN UNIVERSITY |
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Principal Investigator |
MORIYA Tadashi TOKYO METROPOLITAN UNIVERSITY,Professor, 工学研究科, 教授 (50087227)
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| Co-Investigator(Kenkyū-buntansha) |
TAGAWA Norio TOKYO METROPOLITAN UNIVERSITY,Assistant Professor, 工学研究科, 助教授 (00244418)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Ultrasonic Wave / Focusing Method / Transmission Line / Impedance / Fused Quarts Rod / 音速測定 / 複素音響インピーダンス / 音速 |
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| Research Abstract |
(1)A Study for Focusing Ulitrasonic Beam in a High Impedance Materials using Transmission Line Coupler :
A method for focusing an ultrasonic beam within a solid material is presented. Distributed point sources on the surface of the solid are used. The point souces are formed using the tip of an ultrasonic transmission line. A simulation study as well as experimental study was conducted. The main advantage of the method is that the spatial resolution is related to the diameter of the tip of the rod and is not limited by Rayleigh criterion.
(2) A Method for Measuring Complex Acoustic Impedance :
A Method for measuring complex acoustic impedance in small sample using a fused quarts rod as a transmission line is develope. The method features its simplicity and accuracy. The experimental results show that the impedance can be measured with an accuracy less than 1%.
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