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A Periodic Permanent Magnet Omnidirectional Horizontal Shear Mode Electromagnetic Acoustic Sensor

A horizontal shearing and sensor technology, which is applied in the generation of ultrasonic/sonic/infrasonic waves and the use of vibrating fluids to achieve the effects of improving performance, reducing demagnetization factors, and enhancing magnetic induction

Active Publication Date: 2021-03-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on sensors that can excite omnidirectional horizontal shear mode guided waves in plates

Method used

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  • A Periodic Permanent Magnet Omnidirectional Horizontal Shear Mode Electromagnetic Acoustic Sensor
  • A Periodic Permanent Magnet Omnidirectional Horizontal Shear Mode Electromagnetic Acoustic Sensor
  • A Periodic Permanent Magnet Omnidirectional Horizontal Shear Mode Electromagnetic Acoustic Sensor

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Experimental program
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Embodiment Construction

[0028] The present invention will be further described below in conjunction with drawings and embodiments.

[0029] Based on the Lorentz force effect, a periodic permanent magnet type omnidirectional horizontal shear modal electromagnetic acoustic sensor is designed, and the sensor is used to excite a SH with a single mode and a consistent circumferential direction on the aluminum plate. 0 Modal guided waves.

[0030] The structural diagram of the periodic permanent magnet omnidirectional horizontal shear mode electromagnetic acoustic sensor is shown in figure 1 As shown, it includes a non-magnetic material sheet 1, a NdFeB magnet 2, a spiral coil 3 in a flexible circuit board, and a carbon steel sheet 4. The detection object is an aluminum plate with a specification of 1000×1000×1 (unit: mm). Figure 6 is the ultrasonic guided wave group velocity and phase velocity dispersion curve of the aluminum plate above. When the wavelength λ is determined, the frequency of the gener...

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Abstract

The invention discloses a periodic permanent magnet type omnidirectional horizontal shear mode electromagnetic acoustic sensor, which comprises a carbon steel sheet, a fan-shaped NdFeB magnet, a spiral coil, and a nonmagnetic material sheet. Place the spiral coil, NdFeB magnet and non-magnetic material sheet on the surface of the aluminum plate to be tested, and the carbon steel sheet is directly above it. Based on the Lorentz force effect of non-ferromagnetic materials, the excitation of omnidirectional horizontal shear mode SH waves in plate structures is realized. It is verified by experiments that the developed periodic permanent magnet omnidirectional horizontal shear mode electromagnetic acoustic sensor can excite a single SH in the aluminum plate. 0 Modal guided wave; through the omnidirectional test experiment, it is verified that the developed electromagnetic acoustic sensor can excite SH propagating along the 360° direction 0 guided wave. Using the developed periodic permanent magnet type omnidirectional horizontal shear mode electromagnetic acoustic sensor and its array combined with imaging algorithm can realize large-scale and high-efficiency defect imaging of plate structures, which has great application value and potential.

Description

technical field [0001] The invention is a periodic permanent magnet type omnidirectional horizontal shear mode electromagnetic acoustic sensor, which belongs to the field of ultrasonic nondestructive testing, and can excite SH propagating along a 360° direction in a plate structure. 0 Modal guided waves. Background technique [0002] Sheet metal structures are widely used in aerospace, civil engineering, machinery and other fields. In the process of production and use, the metal plate structure will inevitably be damaged, which greatly reduces the service life of the material. In order to ensure the safety of the use of metal plate structures, it is necessary to carry out non-destructive testing on them. As a fast and efficient nondestructive testing method, ultrasonic guided wave technology has been widely used in nondestructive evaluation and health testing of various engineering structures such as plates, pipes and rods. The ultrasonic guided wave detection test needs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B06B1/04G01N29/34
CPCB06B1/0215B06B1/04B06B2201/54G01N29/34
Inventor 刘增华李艾丽赵欣何存富吴斌
Owner BEIJING UNIV OF TECH