| Project/Area Number |
07554011
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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 | 試験 |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Kure National College of Technology |
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Principal Investigator |
KASAMATSU Yoshitaka Kure National College of Technogy, General Education, Professor, 一般科目, 教授 (20043804)
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| Co-Investigator(Kenkyū-buntansha) |
HIHATA Tadamiki Fukuyama Universuty, General Education, Professor, 一般教育, 教授 (30004279)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | NMR spectrometer / ferromagnetic materials / wide range / automatic measurement / coherent |
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| Research Abstract |
It is rather difficult to automatize a swept frequency-type spectrometer for measuring the NMR in ferromagnetic materials, because the tuning and matching of the measuring system at each frequency of interest are needed, which consumes time extremely. This is different from the case of a swept field-type NMR spectrometer for paramagnetic materials, which can be easily automatized only by sweeping the applied magnetic field at a fixed frequency. The purpose of this project is to assemble a computer-controlled NMR spectrometer for ferromagnetic materials by using wide band amplifiers and other compornents on the market.
The process of assembling a new NMR spectometer was as follows.
(1) A self-made NMR spectrometer of the tuned type was rebuilt to work in a wide frequency range between 10 and 1000MHz by using an untuned type of the sample circuit and wide band compornents. Relay circuits were assembled, which control automatically the 180ﾟ phase of the first pulse and the 90ﾟ phase of refe
… More
rence signal for a double balance mixer.
(2) A computer program was made, which controlls a signal generator and a digital oscilloscope.
(3) The assembled system was ajusted in such a way that sensitivity for detecting NMR signals is as equal as possible through the whole frequency range.
The computer-controlled NMR spectrometer successfully operates for measuring the NMR of ferromagnetic Gd compounds and transsition metal compounds. The measure-ments can be continued automatically over a wide frequency range 10-1000MHz even night and day, if necesary.
In our new system there are a few problems to be improved. For example, the sensitivity is a little lower in the frequency range above 500 MHz, and a saturation of the amplifier takes place at some special frequencies owing to mismatch of the impedance at the connecting points of various components in the circuit. These will be improved by using a wide amplifier with high gain in the frequency range above 500 MHz and a aweep generator with high quality in near future. Less
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