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Resonant DC magnetic sensor based on magnetoelectric effect

A magnetoelectric effect, magnetic sensor technology, applied in the field of sensors, can solve the problems of limited application scope, high cost, low sensitivity, etc., and achieve the effects of convenient use, simple structure and good low frequency response

Pending Publication Date: 2022-07-05
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the magnetic sensor based on the magnetoelectric effect is not sensitive to the DC magnetic field, which greatly limits its application range, and most of the existing technologies are in the laboratory stage, with defects such as high cost and low sensitivity.

Method used

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  • Resonant DC magnetic sensor based on magnetoelectric effect
  • Resonant DC magnetic sensor based on magnetoelectric effect
  • Resonant DC magnetic sensor based on magnetoelectric effect

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] The resonant DC magnetic sensor based on the magnetoelectric effect of the present invention includes a sensor package shell 1, a permanent magnet 2, an excitation coil 3 and a magnetoelectric sensitive unit 4, such as figure 1 , figure 2 shown.

[0029] The sensor packaging shell 1 is used to realize the packaging of the permanent magnet 2 , the excitation coil 3 and the magnetoelectric sensitive unit 4 . The sensor package case 1 is composed of an upper case 101 and a lower case 102 . Wherein, the upper casing 101 and the lower casing 102 have the same structure with front, middle and rear sections; the front section 103 and the rear section 104 are equal-sized cuboid sections; the middle section 105 is a semi-cylindrical section, such as image 3 , Figure 4 shown.

[0030] Wherein, the cuboid segments are arranged symmetrically in the front a...

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PUM

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Abstract

The invention discloses a resonant DC magnetic sensor based on a magnetoelectric effect. The resonant DC magnetic sensor comprises a sensor packaging shell, a permanent magnet, an exciting coil, a magnetoelectric sensing unit and a peripheral signal processing circuit, wherein the permanent magnets are packaged on the front and rear sides of the sensor shell; a magnetoelectric sensing unit is packaged in the middle of the sensor; an exciting coil is wound in the middle of the sensor. The sensor is controlled through a peripheral signal processing circuit, a sine wave signal generated by a signal generator is amplified by a voltage amplifier and then is connected with an excitation coil, and an excitation magnetic field generated by the excitation coil enables the magnetoelectric sensing unit to reach a resonance state; in addition, by applying a bias magnetic field through the permanent magnets on the two sides, the sensitivity of the magnetoelectric effect sensor is improved. According to the invention, the regulation and control effect of the DC magnetic field on the magnetoelectric sensing unit is utilized, the limitation that a traditional magnetoelectric effect magnetic sensor can only measure an AC magnetic field is broken through, and the measurement of the DC magnetic field is realized.

Description

technical field [0001] The invention belongs to the technical field of sensors, and relates to the invention of a magnetic sensor based on the magnetoelectric effect and the design of a peripheral excitation circuit and a signal acquisition circuit. Background technique [0002] Magnetic sensors have a wide range of applications in scientific research, industrial production, electronic products and biomedicine, such as non-contact measurement of current in power systems, non-destructive testing using magnetic characteristics of products in industrial production, and today's portable electronics. Magnetic navigation and geomagnetic feature recognition in products, etc. [0003] The magnetic sensor based on the magnetoelectric effect (ME) is composed of a magnetostrictive material and a piezoelectric material to form a magnetoelectric effect sensitive unit. A mechanical stress / strain is generated under the piezo, which is dynamically coupled to the piezoelectric material to g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/06G01R33/00
CPCG01R33/06G01R33/0029
Inventor 张明吉祁玉超彭程远
Owner SHENZHEN TECH UNIV