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| | Abstract | | In recent years, the sea-floor hydrothermal ore deposits attract attention from perspective of securing a stable supply of mineral resources. At Waseda University, the time domain electromagnetic methods with ROV have been tested to apply to the exploration of the sea-floor hydrothermal ore deposits. In the case of sea-floor explorations using ROV, the offset distances and sampling frequencies often cause serious problems compared with the land explorations. Therefore, we are introducing small and highly sensitive MI magnetic sensors with wide frequency bandwidth and low electric power consumptions. However MI magnetic sensors tend to saturate under the Earth's magnetic fields because of its high sensitivity. The purpose of this study is to develop new MI magnetic sensor system with wide dynamic range which would not saturate with the Earth's magnetic fields using negative feedback circuit. |
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