A New Isotropic Magnetoelectric Sensor

Abstract

The invention discloses a novel isotropic magnetoelectric sensor structure. The isotropic magnetoelectric sensor is composed of a cylindrical magnetostrictive material and a cylindrical piezoelectricmaterial. The isotropic magnetoelectric sensor is in a symmetrical state according to the structure itself. In this way, the transformation output of a magnetic field cannot be changed in dependent ofthe included angle between the sensor and the direction of a tested magnetic field. On the above basis, the invention provides an isotropic magnetoelectric measuring device. According to the device,symmetrical magnets are placed right above the sensor and right below the sensor, and then a symmetrically divergent type bias magnetic field is generated. Therefore, the isotropy is not influenced, while the magneto-electricity conversion coefficient is increased at the same time. According to the invention, two magnets are completely coaxial with the magnetoelectric sensor. According to the theoretical analysis result of the finite element modeling process, the sensor is good in isotropy for magnetic field measurement. The invention further provides a forming tool which is simple in structure and capable of realizing the magnetic field measurement under a dynamic scene.

Description

Technical field [0001] The invention belongs to the field of novel magnetoelectric sensors, and more specifically, relates to an isotropic magnetoelectric sensor composed of a magnetostrictive material combined with a piezoelectric material. Background technique [0002] The magnetoelectric effect mainly refers to the polarization phenomenon produced by a magnetic field. So far, the magnetoelectric effect has been found in single-phase materials and composite multiphase materials. According to relevant literature reports, the magnetoelectric effect in single-phase materials is very small. Relatively speaking, the magnetoelectric effect in magnetoelectric composite multiphase materials Very big. The important measurement target of the magnetoelectric effect is its magnetoelectric response coefficient. The larger the magnetoelectric response coefficient, the greater the sensitivity of the magnetoelectric sensor and the better the performance. Therefore, how to improve the magneto...

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Problems solved by technology

[0007] In view of the above defects of the prior art, the present invention proposes an isotropic magnetoelectric sensor, the purpose of which is to realize isotropic measurement of the magnetic field in a two-dimensional plane, thereby solving the problem of the output electrical signal existing in the existing magnetoelectric sensor Technical problems that change with the direction of the measured magnetic field

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