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최근하(K. W. Choi),손대락(D. Son),조육(Y. Cho) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.4
In order to measure magnetic field difference, we have constructed a fluxgate magnetometer which is based on the measurement of apparent corecive field strength from the magnetizing current of two sensors. Co-based amorphous ribbon, which has square shape of ac hysteresis loop, was used as core material. Two sensors have 315 turns of the primary and the secondary windings respectively, and core size of 2 ㎜ wide and 30 ㎜ long. The primary windings are connected parallel to measure external magnetic field difference and the secondary windings serieally for the averaged magnetic induction of the cores. The constructed magnetometer could measure magnetic field difference with sensitivity of 1.6×10^6 V / T and resolution of 1 nT at 1 ㎐ bandwidth.