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Abstract: Compatibility of low noise characteristic and offset stability is essential for a magnetometer to be applicable for measurements of dc and low-frequency magnetic fields. Fundamental mode orthogonal fluxgate (FM-OFG) magnetometer has advantages in its compact design and low noise characteristic, whereas its disadvantage is the offset drift which is unacceptably large for such measurement. An effective technique called bias switching has been proposed to suppress and stabilize the offset of open-l... View more
Abstract:
Compatibility of low noise characteristic and offset stability is essential for a magnetometer to be applicable for measurements of dc and low-frequency magnetic fields. Fundamental mode orthogonal fluxgate (FM-OFG) magnetometer has advantages in its compact design and low noise characteristic, whereas its disadvantage is the offset drift which is unacceptably large for such measurement. An effective technique called bias switching has been proposed to suppress and stabilize the offset of open-loop FM-OFG magnetometers, yet when it is adopted with a feedback configuration to obtain better linearity, it increases noises attributed to the convergence process. In this paper, we present a design of sensor driving electronics of FM-OFG magnetometers to solve this problem and achieve compatibility of low noise and stable offset characteristics with a feedback configuration. The efficacy of the design was verified through various performance evaluations.
Published in: IEEE Sensors Journal ( Volume: 18, Issue: 7, April1, 1 2018 )
Page(s): 2705 - 2712
Date of Publication: 25 January 2018
ISSN Information:
INSPEC Accession Number: 17616780
Publisher: IEEE
Sponsored by: IEEE Sensors Council
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Contents
Contents

I. Introduction

Measurement of magnetic fields especially in DC and low-frequency range is of great importance in various areas, such as geophysical researches and wide range of industries as it is essential for observing geomagnetic fluctuations and volcanic activities, or examining magnetic properties of materials and environments. For such measurements, traditional second harmonic fluxgate magnetometers have been widely used owing to their robust performances [1], [2]. In some cases, applications such as spacecraft magnetic property measurements and scientific observations from spacecraft require even higher accuracy in the order of 0.1 nT [3] with limited device dimensions.

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