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이순칠(Soonchil Lee) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.2
Nuclear Magnetic Resonance (NMR) is a very useful tool for magnet study because it provides information on local spin environment. The valence of magnetic ions, spin canting angle, orbital state can be measured by NMR and the information on the position of the ions and the change of domains and domain walls can be obtained. The principle of operation is discussed with corresponding application examples.
NMR - CT에서 원통좌표계를 구현하는 경사자계의 고안
이대행(Daehaeng Lee),이순칠(Soonchil Lee) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.2
We have designed a magnetic field gradient useful for cylindrical imaging in NMR-CT. The direction of the designed field is parallel to the axis and the gradient in the radial direction of cylindrical coordinate is monotonically increasing. The ratio of the gradient in the radial and axial direction is greater than 10 near the center of coordinate. This ratio depends on solenoid length, the number of reverse current turns at center, and the amount of the reverse current. We built a gradient coil based on the numerical simulation and tested the field generated by NMR-CT. The resulting image matches with the theoretical expectation within 10% error. Since the data acquisition time of 1-D imaging is significantly shorter than 2-D imaging, it becomes possible to image much more dynamic objects by the use of this gradient field.
이정한(Junghan Yi),이대행(Daehang Lee),김민철(Mincheol Kim),이순칠(Soonchil Lee),홍계원(Gyewon Hong),이호준(Hojoon Lee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
A precise magnetic field probe was designed to measure the field distribution inside a superconducting magnet. The operation principle of the developed equipment is based on cw-NMR. The range of field is from 2.8 T to 5.8 T, and the resolution is better than 0.3 ppm NMR samples were water and heavy water contained in a tube of 4 ㎜ diameter and 4㎜ height. This equipment can be manufactured very inexpensively compared with the currently available commertial ones.