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A magnetic sensing device

A technology of magnetic sensing and external magnetic field, applied in the field of sensors, can solve the problems of high cost and low precision, and achieve the effects of high operating frequency, high sensitivity detection, and high sensitivity

Active Publication Date: 2021-01-05
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a magnetic sensing device, aiming to solve the problems of high cost and low precision of the existing resonant sensor in measuring the magnetic field

Method used

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  • A magnetic sensing device
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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] Such as figure 1 As shown, the present invention provides a magnetic sensing device, including a resonance module 101, a telescopic module 102 and a frequency measurement module 103;

[0026] The resonance module 101 is connected to the telescopic module 102 through coupling, and the frequency measurement module 103 is connected to the resonance module through electrodes;

[0027] The resonance module 101 includes a separate resonator, which generates resonant vibration by receiving the voltage signal of the frequency measurement module 103, and the working state changes under the feedback ...

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Abstract

The invention discloses a magnetic sensing device. The device comprises a resonance module, an expansion module, and a frequency measurement module; the resonance module is connected with the expansion module through a coupling way, the frequency measurement module is connected with the resonance module through an electrode; the resonance module comprises a single resonator, and produces resonantvibration by receiving a voltage signal of the frequency measurement module; the expansion module adopts a magnetostrictive material and feeds back the stress produced by the magnetostrictive effect and the change of the elasticity modulus to the resonance module by receiving the external magnetic field change; the frequency measurement module is used for driving the resonant vibration of the resonance module, and acquiring an external magnetic field signal by measuring the working state change of the resonance module. The invention provides a magnetic sensing device of a single-beam resonator, the magnetic field change is converted into the resonator frequency change, thereby realizing low-cost and high-sensitivity magnetic field measurement.

Description

technical field [0001] The invention belongs to the field of sensors, and more specifically relates to a magnetic sensing device. Background technique [0002] Magnetic sensors are widely used and have played an important role in the fields of industry, national defense, science and technology, and medical treatment. They are a major branch of the modern sensor industry. Especially vector magnetic sensors, such as Hall sensors, anisotropic magnetoresistance sensors, giant magnetoresistance sensors, tunnel magnetoresistance sensors, giant magnetoresistance sensors and magnetoelectric Low power consumption and other characteristics, it is widely used in low-cost current measurement, position detection, speed detection, hard disk head, non-destructive testing, etc. However, the above-mentioned low-cost magnetic sensors still have the problem of relatively large low-frequency 1 / f noise, and it is difficult to achieve higher-precision measurement when aligning with the DC magnet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/032
CPCG01R33/0327
Inventor 杨晓非王鲜然刘项力陈实欧阳君李家普
Owner HUAZHONG UNIV OF SCI & TECH
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