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분리형 감지기를 이용한 흐르는 물의 핵자기공명 측정연구
우병칠(B. C. Woo),김철기(C. G. Kim),박포규(P. G. Park),김창석(C. S. Kim),V. Ya. Shifrin(V. Ya. Shifrin) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.3
NMR measurement has been studied for protons in pre-polarized flowing water by a separated detector working at high field far away from the measured field region where the transition of protons is occurred by the perturbation of RF energy. The conditions for NMR signal were optimized on the amplitude and frequency of modulation field, the RF field of detector, water speed, and RF field at the measured field region. The NMR signal with the full width of 320 nT at the half maximum in Lorentzian curve and with signal to noise ratio of 10.5 was measured in the range from a few μT to mT, and its shape and amplitude were independent of the measured field intensity and its uniformity.
우병칠(B.C. Woo),박포규(P.G. Park),김철기(C.G. Kim),유권상(K.S. Ryu),김창석(C.S. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.2
In the measurement of proton gyromagnetic ratio by a low field technique, the compensation of earth's field is required to keep a zero-field space. The constant earth's fild is compensated by a current flowing through a Helmholtz coil, whereas small time-varying component is compensated automatically by a closed loop of feedback system. A feedback amplifier, and two three-dimensional Helmholtz coils having the same coil constant have been constructed in order to compensate the earth's field. field. Preliminary test performed at the ordinary laboratory showed that the time-varying field of ± 100 nT and the constant field have been reduced to the level of ± 10 nT using the compensating system.
Rabi 핵자기 공명법을 이용한 다전류 솔레노이드의 자장균일도 향상
김철기(C.G. Kim),유권상(K.S. Ryu),우병칠(B.C. Woo),김창석(C.S. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
The multicurrent method composed of a main and auxiliary currents was used to make the uniform field near the solenoid center. The auxiliary currents were determined to give the spherical symmetry in the field uniformity from the Legendre polynomials. Rabi's NMR system using polarized flowing water has been constructed and the field of a 4-current solenoid has been determined from the resonance frequency. The field uniformity along the solenoid axis has been improved by adjusting the auxiliary currents.
고자장 펄스마그네토미터 구성 및 희토류 영구자석의 자성측정
김윤배(Y. B. Kim),우병칠(B. C. Woo),박포규(P. G. Park),김만중(M. J. Kim),김택기(T. K. Kim) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.4
A pulsed field magnetometer with maximum applied field of 130 kOe has been constructed. The pulsed field generated by a 18 kJ capacitor bank system combined with a pulse coil was damped oscillation with the period of 10.12 ms. Magnetic hysteresis loop was measured by induction method during 10.12 ms of a pulse duration from the first positive to the second positive peak. The difference from DC magnetic properties due to the eddy current effect was inferred below 3% for the NdFeB magnet with the diameter below 5 ㎜.