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High-resolution Barkhausen noise and incremental permeability scanning imaging system

An incremental permeability, high-resolution technology, used in permeability measurement, material analysis, measurement devices, etc. The structure is not suitable for problems such as small-sized ferromagnetic blocks or magnetic thin-film materials, so as to achieve the effect of improving spatial resolution

Inactive Publication Date: 2019-03-01
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] The invention patent with the publication number CN 104502443A discloses a multifunctional micro-magnetic detection sensor, but its excitation magnetic circuit structure is not suitable for small-sized ferromagnetic blocks or magnetic thin film materials, and the lateral resolution of the sensor is too low to provide high Quality magnetic homogeneity imaging results

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  • High-resolution Barkhausen noise and incremental permeability scanning imaging system
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  • High-resolution Barkhausen noise and incremental permeability scanning imaging system

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Embodiment Construction

[0016] In order to make the object, technical solution and beneficial effect of the present invention clearer, the following will further describe in detail the embodiments of the present invention in conjunction with the accompanying drawings.

[0017] like figure 1 Connect the devices as shown. The two-way signal excitation circuit 1 generates a low-frequency sinusoidal excitation signal (0.5-200 Hz), which is output to the excitation coil 3 through the power amplifier 2, and the generated alternating magnetic field is coupled to the object placed in the stage 9 through the excitation core 13. On the surface of the test piece 8, the Hall element 4 fixedly placed on the lower surface of the material to be tested detects the tangential magnetic field intensity signal.

[0018] Magnetic head 7 is mainly made up of induction coil 17, detection coil 14, magnetic core 18, spring 15 and sensor housing 16 (as figure 2 As shown), the magnetic head 7 is closely attached to the test...

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Abstract

The present invention discloses a high-resolution Barkhausen noise and incremental permeability scanning imaging system. An upper computer controls a multi-functional electromagnetic detection deviceto perform detection of feature magnetic signals such as localization Barkhausen noise, the eddy and the incremental permeability for a ferromagnetic block or magnetic film materials, software in theupper computer can extract at least 14 items of magnetic parameters from the detected feature magnetic signals; a triaxial movement platform is employed to carry a magnetic head in the electromagneticdetection device to perform plane scanning of the ferromagnetic block or the magnetic film materials to obtain a magnetic parameter space distribution imaging result; and the air gap width of a tailend of a magnetic core employed by the magnetic head is changed about 0.2-10[Mu]m, and the lateral resolution of the magnetic head can be regulated in the range of 10-100 [Mu]m. The distribution stateof a plurality of magnetic parameters at the surface of a testpiece is measured to achieve magnetic property imaging so as to reflect the distribution state of the microstructures and the residual stresses in the materials.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic non-destructive testing. It combines a multifunctional magnetic signal detection device and a three-axis motion platform, and configures a high-resolution magnetic sensitive element to realize Barkhausen noise and incremental magnetic detection of ferromagnetic blocks or magnetic thin film materials. Conductivity scan imaging. The imaging results can be directly used to determine the magnetic homogeneity of the material, and indirectly reflect the internal microstructure of the material and the distribution state of residual stress. Background technique [0002] In the research on the preparation process of ferromagnetic bulk or magnetic thin film materials and the quality control of finished products, technical means are required to detect the uniformity (thickness, magnetic properties, microstructure, residual stress) of the prepared samples. Existing studies have shown that through rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12G01N27/72G01N27/90G01L5/00
CPCG01L5/0047G01N27/725G01N27/902G01R33/1223
Inventor 刘秀成尚万里王丽婷王楠何存富吴斌
Owner BEIJING UNIV OF TECH
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