<論文>人工衛星搭載用RING-CORE型FLUXGATE磁力計の製作

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This is a report on the first ring-core type fluxgate magnetometer manufactured in Japan under a cooperative wrok among the three teams: Tohoku Institute of Technology team, Tohoku University team, and Tokai University team. The ring core consists of 6-81 Mo permalloy tape of 10 μm thick and 3 mm width wound m times around a ceramic bobbin of a diameter d. In order to find the best core, two sets of the following twelve different kinds of core were prepared: 5-79 Mo permalloy and 6-81 Mo permalloy, m=9, 12, and 15, and d=20 mm and 30 mm. One set was examined by the Sendai team (Tohoku Inst. Tech. and Tohoku Univ.) and the other by the Tokai Univ. team. Each of the cores is wound by a 150-turn driving toroidal coil and packed in a 1100-turn pickup coil case. When a common ten-volt drive current is applied, the output voltages V for the 12 cores are in the following relations: V_<6-81> > V_<5-79>, V_<30> > V_<20>, and V_9 > V_<12> > V_<15>. On the next step we applied drive currents with V_0 = 6, 8, 10, and 12 volts, and measured the input power W and the output gain G for various drive frequency f_0, and found that G becomes largest for the smallest W at f_0=10kHz. Finally we constructed a fluxgate magnetometer with a 6-81 ring core of m=9, d=20mm, and f_0=10kHz and recorded geomagnetic variations at the Onagawa Magnetic Observatory of Tohoku University. The records were compared with simultaneous records by another commercial biaxial magnetometer. Conclusion is that our ring-core type magnetometer is so sensitive, small, and light in comparison with the previous satellite-borne biaxial magnetometers that an improved ring-core type one is quite possible to be loaded on Japanese artificial satellites.

<論文>人工衛星搭載用RING-CORE型FLUXGATE磁力計の製作

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