| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 102 === In this study, taking the previous research results of PCB fluxgate in our laboratory as the theoretical basic knowledge, a new type of fluxgate with planar excitation and pick-up coils and a fluxguide is proposed for 3D magnetic field detection. In this new design, we use double-sided printed circuit board to integrate the excitation coil and the pick-up coil into the same plane, and adopt a cross shaped magnetic core to construct a complete sensing mechanism. To sense Z-axis magnetic field, we put a hollow cylinder of ferrite on the magnetic core as a fluxguide to guide the Z-axis magnetic field to the cores in X-axis and Y-axis, and switch the series connecting mode of the pick-up coils to get the correct output. In this study we analyze the parameters referred to the design of fluxgate such as the coil size, magnetic core size, excitation mode and so on. The experimental results shown that in the X and Y sensing mode, the sensitivity can achieve 122.42 V/T and the noise is 0.115 nT/√Hz at 1 Hz when excited with 550 mA and 50 kHz. In the Z sensing mode, the sensitivity can achieve 11.61 V/T and the noise is 6.92 nT/√Hz at 1 Hz when excited with 550 mA and 50 kHz. The performance of the sensor design verifies the feasibility of a fluxgate sensor comprising planar coils and a fluxguide for 3D field sensing. Further primary works to improve the performance includes enhancing the Z-axis sensitivity and realizing a silicon chip device of this kind, so that one can implement a fluxgate with small size, low power consumption, and 3D field sensibility.
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