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박포규(P. G. Park),손대락(D. Son),우병칠(B. C. Woo),김창석(C. S. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.2
The low magnetic field standard below 1 mT with resolution of 100 nT has been established for the calibration and testing of low field magnetometers. A precision single layered solenoid, which is made of quartz tube and bare copper wire, was constructed in order to generate a precise magnetic field. To improve the field homogeneity in the solenoid, three-current method was employed. The injected current and injection points on the solenoid were optimized by computer simulation. The magnetic field uncertainty in the solenoid was 0.1 % and 0.01 % in the range of ± 5 ㎝ from the center for a single and three-current methods respectively. We also constructed a testing system for the dynamic properties of low field magnetometers.
비정질 연자성재료를 이용한 복층 차폐체의 저주파 자기장 차폐효과
김성규(S. G. Kim),허진(J. Hur),박포규(P. G. Park),정연춘(Y. C. Chung),김윤배(Y. B. Kim),김택기(T. K. Kim) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.6
Magnetic shielding effect of cylinderical shields made of commercial amorphous ribbons has been studied. The shell-arragement-order of double shell shield has been found to show a striking difference in shielding factor. In low applied field region, a 2605CO-2705M-shield (outer shell: 2605CO, inner shell: 2705M) yields two times higher shielding factor than a 2705M-2605CO-shield (outer shell: 2705M, inner shell: 2605CO). The reasons are as follows: In case of 2605CO-2705M-shield, the outer shell is not easily saturated and effectively shields the applied field. In addition, the inner shell shows high shielding factor in the field shielded by the outer shell. In case of 2705M-2605CO-shield, the outer shell is saturated at very low field as well as the inner shell shows low shielding factor in the field shielded by the outer shell.
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.