Electromagnetic ultrasonic Lamb wave transducer for guided wave tomography

An electromagnetic ultrasonic and transducer technology, applied in directions such as the generation of ultrasonic/sonic/infrasonic waves, can solve the problems of small pointing angle and mixing of guided wave modes, and achieve the effect of eliminating the influence of multiple modes and facilitating extraction.

Inactive Publication Date: 2014-10-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention is to solve the problems of the existing electromagnetic ultrasonic Lamb wave transducer with small directing angle and mixed guided wave modes, and proposes an electromagnetic ultrasonic Lamb wave transducer for guided wave tomography

Method used

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  • Electromagnetic ultrasonic Lamb wave transducer for guided wave tomography
  • Electromagnetic ultrasonic Lamb wave transducer for guided wave tomography
  • Electromagnetic ultrasonic Lamb wave transducer for guided wave tomography

Examples

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specific Embodiment approach 1

[0028] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this embodiment mode, a kind of electromagnetic ultrasonic Lamb wave transducer for guided wave tomography described in this embodiment mode, it comprises the permanent magnet 1 of longitudinal magnetization and the zigzag coil 2 of n-turn semicircular type; Wherein , 2≤n≤14;

[0029] The permanent magnet is a cuboid permanent magnet 1 whose length and width are greater than the diameter of the coil, and the magnetic induction of the static magnetic field of the permanent magnet 1 is not less than 0.15T;

[0030] Each turn of the semicircular meander coil 2 includes m wires, and the distance between the centers of two adjacent turns of wires in the radial direction is d=λ / 2, where λ is the wavelength of the selected Lamb wave mode at frequency f; 3≤m≤23;

[0031] The n-turn semicircular zigzag coil 2 is made into a double-sided PCB circuit board, and the PCB circuit board is arranged directly...

specific Embodiment approach 2

[0037]Embodiment 2. This embodiment is a further description of the electromagnetic ultrasonic Lamb wave transducer for guided wave tomography described in Embodiment 1. The n-turn semicircular zigzag coil 2 is wound with an enameled wire made.

specific Embodiment approach 3

[0038] Specific embodiment three. This embodiment is a further description of an electromagnetic ultrasonic Lamb wave transducer for guided wave tomography described in specific embodiment one. The permanent magnet 1 adopts an N52 type NdFeB permanent magnet. .

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Abstract

The invention discloses an electromagnetic ultrasonic Lamb wave transducer for guided wave tomography, belongs to the technical field of the guided wave tomography of metal panels, in particular relates to an single-mode electromagnetic ultrasonic Lamb wave transducer with a 180-degree directional angle, and solves the problems that the directional angle of an existing electromagnetic ultrasonic Lamb wave transducer is small and excitation guided wave modes are mixed. According to the electromagnetic ultrasonic Lamb wave transducer, a permanent magnet is a rectangular permanent magnet of which the length and the width are greater than the diameter of a coil, and the magnetic induction intensity of a static magnetic field of the permanent magnet is not smaller than 0.15T; each turn of semicircular zigzag coil comprises m wires, and the center distance d between two adjacent turns of wires in the radial direction is equal to lambda / 2; and n turns of semicircular zigzag coils are manufactured into a double-face PCB (printed circuit board) which is arranged right below the permanent magnet. The electromagnetic ultrasonic Lamb wave transducer is applicable to the tomography of various metal panel structures with uniform material properties.

Description

technical field [0001] The invention belongs to the technical field of guided wave tomography of metal plates, and in particular relates to an electromagnetic ultrasonic Lamb wave transducer with a single-mode 180-degree directivity angle. Background technique [0002] In the fields of materials, machinery and chemicals, aluminum plates are prone to defects such as cracks and corrosion during production, processing, transportation and use. Modern industry has very strict requirements on product quality, and small defects may cause serious threats to the environment and the economy. Therefore, many countries have added non-destructive testing as a key technical link to control product quality into their own production systems. With the improvement of detection technology, the requirements of modern industry for non-destructive testing are no longer simply to determine the presence or absence of defects, but also to determine the size and depth of defects, which requires the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34
Inventor 康磊张超金昱蒋韬李永虔邓超然柳新王淑娟
Owner HARBIN INST OF TECH
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