A Frequency Modulation GMI Magnetic Sensor Base on Inverter Multivibrator with Longitudinal Excitation

Bo Yang; Xiong Zhu Bu; Xian Jin Huang

doi:10.4028/www.scientific.net/AMM.423-426.2303

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 423-426A Frequency Modulation GMI Magnetic Sensor Base on...

A Frequency Modulation GMI Magnetic Sensor Base on Inverter Multivibrator with Longitudinal Excitation

Abstract:

Frequency Modulation (FM) GMI Magnetic Sensors has excellent performance in high signal-to-noise ratio and low power consumption. In this article, the FM magnetic sensors with longitudinal excitation are presented. The inductance of the sensing head versus the excitation frequency and the external magnetic field is tested by the impedance analyzer. The results show that the inductance is sensitive with the excitation frequency from 200kHz to 600kHz. The bias magnetic field generated by a permanent magnet is used to make the sensing head working at a linear region with the highest sensitivity. Three kinds of magnetic sensors with different inverter multivibrators circuits are illustrated and their static characteristics are provided through calibration experiments and data analysis. It shows that the first type has the highest sensitivity (41.0kHz/Oe) and the third type has the best linearity.

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Periodical:

Applied Mechanics and Materials (Volumes 423-426)

Pages:

2303-2307

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.423-426.2303

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Online since:

September 2013

Authors:

Bo Yang, Xiong Zhu Bu, Xian Jin Huang

Keywords:

amorphous ribbons, Frequency-Modulation, Giant Magnetic Impedance Effect, Weak Magnetic Sensor

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