水星探査機搭載用フラックスゲート磁力計の広範囲温度試験

概要

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The Mercury spacecraft mission, Bepi-Colombo Mercury Magnetosphric Orbiter (MMO), is one of the cooperative projects between Japan and Europe. A ring-core-type fluxgate magnetometer made in Japan will be installed on the MMO for observing the magnetic field of Mercury and Mercury's magnetosphere. Interplanetary magnetic field observation is very important for clarifying the interaction between solar wind and planetary magnetosphere structures. Although the fluxgate magnetometer has been used for many magnetic field observations, there is a problem of a temperature dependence. The temperature change of the sensor is assumed to range from -100 to +175℃ during the research mission. However, no existing nonmagnetic temperature test apparatus can over this wide temperature range. Thus, we have developed a wide-temperature-range testing system and tested two kinds of sensor, one with a bobbin made of INCONEL and the other with a bobbin made of ceramic. We obtained data on sensor sensitivity, offset drift, and noise level in the range from -160 to +200℃ using this testing system. As a result, the ceramic sensor showed poorer performance than the INCONEL sensor on the low-temperature side below -100℃, and no marked difference in the temperature characteristics was observed on the high-temperature side over -100℃.
東海大学の論文