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유권상(K. S. Ryu),김창석(C. S. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
The NMR signal by induction method was observed in a solenoid field of 1.0 mT. The center frequency and the half width at the half maximum of NMR signal were 42.588 ㎐ and 2.2㎐ in a field gradient of 3 ppm/㎝. The NMR signals in different field gradients were compared with the theoretical values by considering the weighting factor of sample.
유권상(K. S. Ryu),김철기(C. G. Kim),김중복(J. B. Kim),김현아(H. A. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.1
We have constructed a displacement sensor for measuring dynamic magnetostriction of an amorphous ribbon under alternating magnetic field using fiber optic Fabry-Perot interferometer. The signal of the sensor was dependent on the index matching oil and the optical isolator. The resolution of the sensor was 30 Å and the measured peak to peak magnetostriction of the amorphous ribbon Fe_(81)B_(13.5)Si_(3.5)C₂ was 28×10^(-6).
자화방향에 따른 비정질 Co66Fe₄NiB₁₄Si15 리본의 자기임피던스 효과
유권상(K. S. Ryu),김철기(C. G. Kim),윤석기(S. G. Yoon),양재석(J. S. Yang),손대락(D. Son) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.3
Magneto-impedence (MI) were measured in amorphous Co_(66)Fe₄NiB₁₄Si15 ribbons at 100 ㎑ as a function of the angle from ribbon axis. The samples were prepared using etching method, with the angle deviated from ribbon axis, 0˚, 30˚, 45˚, 60˚ and 90˚. The MI measured in 60˚sample increased with the increasing magnetic fields. The dip in profile appears at H=0 above the angle of 30˚. The maximum values of MI and their dips are increased with the cutting angle, but the maximum value of MI decreased at 90˚. The increase of MI with the angle was analyzed in terms of the transverse magnetic permeability.
유권상(K. S. Ryu),박진습(J. S. Park) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.6
Coercivity is defined as the magnetic field strength required to reduce the magnetic polarization to zero of magnetic specimen which has been previously magnetized to saturation. This quantity is a reference for classifying soft and hard magnetic materials. We have constructed the measuring system for measurement of coercivity of ferromagnetic materials in open magnetic circuit. The measurement range of the constructed system is from tens A/m to tens ㎄/m, the combined uncertainty is ±0.22 ㎄/m as coercivity is 14.63 ㎄/m.
전원주파수 교류자기장 내성평가용 대형 3-축 사각 헬름홀쯔 코일 시스템 제작
유권상(K. S. Ryu),김창석(C. S. Kim),정낙삼(N. S. Chung) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
We constructed the large 3-axis square Helmholtz coil system for the power frequency magnetic field immunity test. We measured the coil factors and magnetic field homogeneities of the fabricated 3-axis square Helmholtz coil. The experimental results for the field homogeneities are in agreement with the theoretical data. From these results, we determined the effective areas for the immunity test. We also confirmed that the low current using the multi-turns coil can be applicable to the immunity test for the high field in short duration.
강자성 배관 외ㆍ내부 벽의 racetrack형 결함깊이와 부피응력이 누설자속에 미치는 영향
유권상(K. S. Ryu),박영태(Y. T. Park),손대락(D. Son),D. L. Atherton(D. L. Atherton),L. Clapham(L. Clapham) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Non-linear anisotropic materials were used to simulate the effects of bulk tensile stress in 3D finite element analysis (FEA). FEA was used to calculate the effects of near and far-side racetrack pit depth and simulated bulk tensile stress on magnetic flux leakage (MFL) signals. The axial and radial MFL signals were depended on near and far-side racetrack pit depth and on the bulk stress, but the circumferential MFL signal was not depended on them. The axial and radial MFL signals increased with greater pit depth and applied bulk stress, but the circumferential MFL signal was scarcely changed.
강자성 배관 외ㆍ내부 면의 이중 원형 결함의 깊이와 응력이 누설자속에 미치는 영향
유권상(K. S. Ryu),박영태(Y. T. Park),손대락(D. Son),D. L. Atherton(D. L. Atherton),L. Clapham(L. Clapham) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Non-linear anisotropic materials were used to simulate the effects of tensile stress in 3D finite element analysis (FEA). FEA was used to calculate the effects of far and near-side pit depth and tensile stress on magnetic flux leakage (MFL) signals. The axial and radial MFL signals were depended on far and near-side double circular pit depth and on the stress, but the circumferential MFL signal was not depended on them. The axial and radial MFL signals increased with greater pit depth and applied stress, but the circumferential MFL signal was scarcely changed.
Rabi법 핵자기 공명에 의한 0.1 mT의 저자장 측정
유권상(K.S.Ryu),김철기(C.G.Kim),우병칠(B.C. Woo),김창석(C.S.Kim) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.2
The Rabi's NMR experiment using polarized flowing water was performed in order to measure the low field and the good NMR signal was obtained in the range of 0.1 mT. There was a change in amplitude and phase of signal due to the sinusoidal variation with the increasing RF field. The nominal field could be determined within a few tens ppm uncertainty by the NMR signal under the optimized RF condition.