Fluxgate magnetic field sensor based on magnetoelectric effect

Abstract

The invention discloses a fluxgate magnetic field sensor based on a magnetoelectric effect, and relates to a magnetic field sensor. The fluxgate magnetic field sensor is provided with a layered magnetoelectric composite material, an excitation coil and a piezoelectric layer signal output lead. The layered magnetoelectric composite material is an amorphous strip Metal-glass / PVDF layered magnetoelectric composite material. The excitation coil is a symmetric series-opposing excitation coil. The symmetric series-opposing excitation coil is wound on the layered magnetoelectric composite material Metal-glass / PVDF, and a function signal generator outputs an AC sinusoidal voltage signal to drive the excitation coil. A double-frequency output signal of the piezoelectric layer is measured by a lock-in amplifier. When a DC magnetic field passes through the fluxgate magnetic field sensor, the output signal measured by the lock-in amplifier includes the phase and amplitude, and the magnitude and direction of the applied DC magnetic field can be directly reflected. The magnetoelectric composite material is used as the magnetic core, and an electromagnetic coil is used as the excitation coil.

Description

technical field [0001] The invention relates to a magnetic field sensor, in particular to a magnetic field sensor based on magnetoelectric effect and fluxgate principle. Background technique [0002] The magnetoelectric effect refers to the phenomenon that the material is electrically polarized under the action of an external magnetic field or the material is magnetized under the action of an external electric field. [1] . The magnetoelectric effect was first discovered in Cr 2 o 3 Found in single crystals, the magnetoelectric effect of this single-phase magnetoelectric material is usually weak and can only be detected at lower temperatures [2] . Compared with single-phase magnetoelectric materials, magnetoelectric composite materials have stronger magnetoelectric effects and can be widely used in sensors and other fields [3-6] . The magnetoelectric sensor uses the magnetoelectric effect of the magnetoelectric material, that is, the application of a magnetic field caus...

AI Technical Summary

Problems solved by technology

Although such fluxgate sensors are relatively inexpensive, their power consumption tends to be quite high due to the periodic saturation excitation of the magnetic core material by an alternating magnetic field.

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