Characterization of Dual-Magnetic-Core Fluxgate Magnetometer and Investigation of Driving Circuits
碩士 === 國立臺北科技大學 === 機電整合研究所 === 97 === The characteristics of the dual-core fluxgate sensors are probed and the driving circuits for linear magnetometer are investigated in this thesis. The influence of excitation frequency, amplitude and hysteresis on magnetometers was discussed. The fluxgate is im...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2009
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| Online Access: | http://ndltd.ncl.edu.tw/handle/ejd8g3 |
| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 97 === The characteristics of the dual-core fluxgate sensors are probed and the driving circuits for linear magnetometer are investigated in this thesis. The influence of excitation frequency, amplitude and hysteresis on magnetometers was discussed. The fluxgate is implemented with nickel-iron alloy which has high permeability. The sensitivity of fluxgate magnetometer was enhanced by feedback circuits, and the power consumption of excitation coil was reduced by LC resonance circuit. The sensitivity of the built magnetometers is 17.4 mV/uT, and the noise is 29.048 nT/Hz1/2 at 1 Hz. The dc-field measurement capability is verified by measuring the angular response to the Earth’s magnetic field. The micro- chip circuit was also designed with HSpice, Laker and Calibre softwares supported by CIC. The results of present work are valuable for measurement of the low level magnetic field with the frequency from dc to 1 kHz and the intensity from 10 nT to 1 mT.
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