Remote sensing of Induced Current in Magnetic Czochralski Crystal Growth
| Project/Area Number |
09650012
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Yamanashi University |
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Principal Investigator |
KASUGA Masanobu Yamanashi University, Dept. Electronics, Professor, 工学部, 教授 (30023170)
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| Co-Investigator(Kenkyū-buntansha) |
矢野 浩司 山梨大学, 工学部, 助手 (90252014)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1999: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Magnetic Czochralski method / melt growth / eddy current / inverse problem / Biot-Savart Law / Joule's heat / remote sensing / infrared imaging / 渦電流 / 融液からの成長 / 磁場卯加 / 誘起電流 / 誘起磁場 / 非接触測定 / 運動導体 / ガリウム / ビオ・サバ-ルの法則 |
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| Research Abstract |
(1) Establishment of the Measurement Principle
Based on Biot-Savart Law and the current induced by the movement of a conducting top in magnetic field, we have calculated the induced secondary magnetic field at arbitrary points outside of the top.
(2) Measurement of the Induced Field
Using solid gallium and liquid gallium as specimen materials, we have measured the induced magnetic field. Solid gallium made a symmetrical large field which is predicted by the theory involving shunt effect. But liquid gallium made a small, nonsymmetrical, complex field. which requires more comprehensive analysis.
(3) Measurement of Temperature Rising by the Joule's Heat
Since the estimation of the induced current through magnetic field is an inverse problem, we need another way of estimation to assure the uniqueness of the solution. As another approach we measured the surface temperature of the top with time by the infrared thermometer and compared the data with the electric current data. Both data coincide qualitatively. We are continuing more quantitative examination.
(4) Development in Future
By analyzing the saturation and the decrease effect of the induced current density with increasing applied magnetic field, we would understand the suppression mechanism of the flow by the magnetic field. We are also planning to catch the induced current more directly by probing the potential of the surface of rotating top and to calibrate the remote sensing data.
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Report
(4 results)
Research Products
(11 results)
