雙芯磁通閘磁量計特性測定與驅動電路研製

Characterization of Dual-Magnetic-Core Fluxgate Magnetometer and Investigation of Driving Circuits

黃柏魁(Bo-Kuei Huang)

指導教授 ： 呂志誠 ； 鄭振宗

國立臺北科技大學/機電學院/機電整合研究所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00410

摘要

本研究探討磁通閘(fluxgate)磁場感測器配置與磁芯材料特性、並研製驅動電路，探討激發磁場頻率、振幅、與磁芯磁滯曲線對磁量計之磁場-電壓轉移率的影響。使用高磁透率鎳-鐵合金作為磁芯製作繞線式磁通閘磁場感測器，驅動電路採用磁場回授電路來提高磁通閘磁量計之靈敏度與線性範圍，並以LC共振電路以降低激磁線圈的功率消耗。所研製的磁量計，其靈敏度為 17.4mV/uT，1 Hz的雜訊為29.048 nT/Hz1/2。磁量計測量直流磁場的能力，係利用其在地磁埸中的各角度的反應來驗證。本研究並利用CIC所提供HSpice、Laker與Calibre軟體，進行微晶片電路模擬。本研究成果可應用於頻率dc至1 kHz，磁通密度10 nT至1 mT的微小磁場測量。

關鍵字

磁通閘磁量計 ； 磁滯曲線 ； 微晶片電路

並列摘要

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.

並列關鍵字

fluxgate magnetometer ； hysteresis ； micro-chip circuit

參考文獻

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