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Multi-coupling magnetic sensor

A technology of a magnetic sensor and a sensor body, applied in the field of electronic devices, can solve the problems of high price, complicated manufacturing process, restricting general application, etc., and achieve the effect of realizing industrialized production, simple manufacturing process, and easy industrialized production.

Active Publication Date: 2014-04-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These sensors have their own advantages and disadvantages. For low-frequency detection, the highest-precision sensor is currently SQUID. However, SQUID needs to work at low temperature and is expensive, so it is difficult to be widely used; other magnetic sensors with higher detection accuracy There are atomic magnetic force type, fluxgate type, magnetoresistance type, optical pump type, etc. However, these types of magnetic sensors are either expensive or have complex manufacturing processes, which restrict their general application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the multi-coupled magnetic sensor of the present invention fixes one end of the sensor body by clamping; the sensor body includes a magnetostrictive sheet 2 and a piezoelectric sheet 1 glued to the magnetostrictive sheet 2 by 502 glue, the magnetostrictive sheet 2 and the piezoelectric sheet. The sheets 1 are connected together in a single lamination structure, and the magnet block 3 glued to the piezoelectric sheet 1 by 502 glue; the polarization direction P of the piezoelectric sheet 1 is its thickness direction, and the thickness surface of the piezoelectric sheet 1 There are output electrodes, as the voltage output terminal Vo of the piezoelectric sheet 1; the S pole of the magnet block 3 is close to the piezoelectric sheet 1 and the magnetization direction M (that is, the magnetic moment M) of the magnet block 3 is perpendicular to the position where the magnetostrictive sheet 2 is located. Thickness surface; the magnet 4 is placed away f...

Embodiment 2

[0042] Such as figure 2 As shown, the multi-coupling magnetic sensor of the present invention is an improvement to the multi-coupling magnetic sensor in embodiment 1. The difference from embodiment 1 is that two piezoelectric sheets with opposite polarization directions P are used instead of one piezoelectric sheet in embodiment 1. The electric sheet 1 forms a piezoelectric bimorph 1, and the voltage output is output in series mode. The magnet block 3 of this embodiment can also be replaced and pasted on the lower right side of the magnetostrictive sheet 2 .

Embodiment 3

[0044] Such as image 3 As shown, the multi-coupling magnetic sensor of the present invention is an improvement to the multi-coupling magnetic sensor in embodiment 2, so that the conversion effect of magnetoelectricity is better, and the difference from embodiment 2 is that a magnet block 5 is added on the magnetostrictive sheet 2 Below, the N pole of the magnet block 5 is glued with the magnetostrictive sheet 2 by 502 glue, the magnet block 5 is set opposite to the magnet block 3, and the magnetic moment M of the magnet block 5 is consistent with the magnetic moment M of the magnet block 3.

[0045] In this example, the magnetic signal H of the AC magnetic field to be detected ac In the case of 10Hz and 0.1Oe input, a voltage output of 7.92mV is obtained, which is equivalent to a magnetoelectric voltage coefficient of 1.32V / cm.Oe. Contrast the conventional magnetostrictive-piezoelectric bimorph without adding magnet block 3 and magnet block 5 (see the article titled "Detecti...

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Abstract

The invention discloses a multi-coupling magnetic sensor. The multi-coupling magnetic sensor comprises a sensor main body and a DC magnetic field on the sensor main body; the sensor main body comprises a magnetostrictive material sheet, a piezoelectric material sheet composited with the composited through interface connection, and a magnet block composited with the magnetostrictive material sheet and / or the piezoelectric material sheet through interface connection, wherein the piezoelectric material sheet is provided with a voltage output end. The multi-coupling magnetic sensor of the invention can simply regulate the phases of magnetostriction-piezoelectricity and magnetic torsion-piezoelectricity by boundary conditions, so as to superpose two coupling effects to obtain the magnetoelectric coupling effect larger than the general magnetostriction-piezoelectricity or magnetic torsion-piezoelectricity, thereby outputting higher voltage.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to a multi-coupling magnetic sensor capable of detecting magnetic signals. Background technique [0002] Sensor technology has become an important technology that restricts modern progress, and the development of sensors has gone through a development process from common to high precision, expensive to popular, and the development of cheap, high-precision, low-power sensors has become the current development of sensors. a big trend. [0003] As one of the sensor categories, the magnetic sensor plays an increasingly important role in the development of modern science and technology, and its reliability and flexibility make it more and more widely used. In terms of types, magnetic sensors can be divided into: induction coil type (Search coil), Hall effect type (Hall effect), magnetoresistance type (AMR or GMR), magnetic tunnel type (MTJ or SDJ), magneto-optical type ( Magneto-optic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/02
Inventor 邢增平钱华荣徐凯何彬
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI