| Project/Area Number |
12440121
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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 |
固体地球物理学
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
YONEDA Akira Institute for Study of the Earth's Interior, Associated Professor, 固体地球研究センター, 助教授 (10262841)
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| Co-Investigator(Kenkyū-buntansha) |
KATSURA Tomoo Institute for Study of the Earth's Interior, Associated Professor, 固体地球研究センター, 助教授 (40260666)
SUZUKI Isao Faculty of Science, Professor, 理学部, 教授 (60033198)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2000: ¥7,800,000 (Direct Cost: ¥7,800,000)
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| Keywords | ultrasound spectroscopy / perovskite / lower mantle / 670 km discontinuity / γ-スピネル / イルメナイト / 荷重補正 / マントル / 高圧相鉱物 / 地震波速度 / 弾性波速度 / ベータスピネル / パイロープ / 温度微係数 |
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| Research Abstract |
The results summarized below.
1. Lock-in -Amplifier was introduced for ultrasound spectroscopy. It is indispensable to detect small signals masked by back ground noise. It also useful to reconstruct signal pattern disturbed by noise. The "cos" component and "sin" components of the signal simultaneously measured by the Lock-in-Amplifier so that we can conduct background correction separately for the two components.
2. We confirmed that handmade -transducers are useful up to 50 MHz. This innovation, combined with the above improvement, is important for future development of high frequency ultrasound spectroscopy.
3. Resonance frequency shift by clamp force was also examined fro rectangle specimen. The proposed mechanism for the frequency shift was confirmed again in rectangle resonance method as well as sphere resonance method. The knowledge can be applied for identification of resonant peaks in the future study.
4. Measurements of β, γ spinels and perovskite have finished. The implications of the results are now considering.
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