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Method and apparatus for testing magnetosensor resonant frequency elasticity

A magnetoelastic sensor and resonant frequency technology, applied in the direction of frequency measurement devices, instruments, signal transmission systems, etc., to achieve the effects of eliminating influence, improving measurement accuracy, and expanding the scope of application

Inactive Publication Date: 2008-07-30
HUNAN UNIV
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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems existing in the detection of the resonant frequency of the existing magnetoelastic sensor, the present invention provides a device and method for detecting the resonant frequency of the magnetoelastic sensor under the condition of continuous excitation. resonant frequency

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  • Method and apparatus for testing magnetosensor resonant frequency elasticity
  • Method and apparatus for testing magnetosensor resonant frequency elasticity

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing.

[0029] Referring to Figures 1 and 2, Figures 1 and 2 are structural diagrams of the excitation coil and detection coil winding diagram in the present invention, in which 1 is the excitation coil, 2 is the detection coil, and 3 is the magnetoelastic sensor. Since the detection coil is in the magnetic field generated by the excitation coil, even if the magnetoelastic sensor is not placed, magnetic coupling will occur, and an induced electromotive force with the same frequency as the excitation signal will be generated on the detection coil, which will affect the measurement results. In order to eliminate the background noise signal of the same frequency band induced by the excitation that is stronger than the effective signal output by the magnetoelastic sensor, a detection coil structure of a symmetrical anti-winding decoupling complex coil is designed, which can well elimina...

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Abstract

The invention discloses a resonant frequency detection method for magnetoelasticity sensor and a device thereof. The detection device comprises a detection coil, an exciting coil, a DC exciting branch circuit, an AC frequency sweeping branch circuit, and a signal detection and processing device, wherein the DC exciting branch circuit is connected with the AC frequency sweeping branch circuit in series and then connected to the exciting coil, and the signal input end of the signal detection and processing device is connected with the output end of the detection coil. The detection coil structure in the detection device is symmetric reverse-winding uncoupling combined detection coil structure, i.e. two single coils in the combined detection coil have the same turn number and reverse winding direction, and are wrapped with the exciting coil, so that the positions of the two reverse-winded coils in the exciting magnetic field are symmetric. The detection device and method of the invention can accurately measure the resonant frequency of the magnetoelasticity sensor in different media.

Description

technical field [0001] The invention belongs to the field of instruments and signal detection, and relates to a resonance frequency detection device and method of a magnetoelastic sensor. Background technique [0002] Ferromagnetic materials will undergo magnetic coupling resonance in the mid-frequency range, and its resonance frequency is not only related to the properties and dimensions of the material, but also affected by the external environment, such as temperature, pressure, viscosity, etc. Magnetoelastic sensors made of ferromagnetic materials can be used to make various biological and chemical microsensors, such as blood viscosity sensors, trypsin sensors, α-amylase sensors, phosphatase activity sensors, etc. The advantage of this sensor is that the measurement cost is low, and it is a non-contact measurement. In addition to being used in the laboratory, it can also be used for in vivo measurement of organisms. Measuring the change of the resonant frequency of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02G08C19/00
Inventor 蔡青云杨唐胜何令文
Owner HUNAN UNIV
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