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Omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer

A magnetic concentrator, transducer technology, applied in the generation of ultrasonic/sonic/infrasonic waves, and the use of vibrating fluids, etc., to achieve the effect of improving modal unity

Active Publication Date: 2019-09-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, it is possible to excite an omnidirectional single S in the board 0 There are few reports on electromagnetic acoustic transducers with modal guided waves

Method used

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  • Omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer
  • Omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer
  • Omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer

Examples

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with drawings and embodiments.

[0035] Based on the Lorentz force effect, an omnidirectional magnetic concentrator type electromagnetic acoustic transducer is designed, and the transducer is used to excite S with a single mode and a consistent circumferential direction on the aluminum plate. 0 Modal guided waves.

[0036] The structure diagram of the omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer is as follows: figure 1As shown, it includes an NdFeB magnet 1, a magnetic concentrator 2, and multiple clusters of circular folded coils 3 in a flexible circuit board. The detection object is an aluminum plate with a specification of 1000×1000×1 (unit: mm). Figure 5 is the ultrasonic guided wave group velocity and phase velocity dispersion curve of the aluminum plate above. When the wavelength λ is determined, the generated S can be uniquely determined 0 The frequenc...

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Abstract

The invention discloses an omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer, wherein the transducer comprises a cylindrical neodymium-iron-boron magnet, a magnetic concentrator and a circular array type back-folding line ring. The multi-cluster circular zigzag line ring in a flexible circuit board is placed on the surface of an aluminum plate to be detected,and the magnetic concentrator and the neodymium-iron-boron magnet are attracted and then placed right above a return line ring. Based on lorentz force effect, the stimulating of omni-directional S0 modal guided wave in a plate structure is realized. Experiments verify that the prepared array type omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer can be usedfor stimulating a single S0 mode guided wave in the aluminum plate; with an omni-directional test experiment carried out, the developed omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer can stimulate to a S0 guide wave spread in the 360-degree direction; and a defect detection experiment verifies that the omnidirectional magnetic concentrator type lamb wave electromagnetic acoustic transducer can effectively reduce the analysis difficulties and errors of defect signals.

Description

technical field [0001] The invention is an omnidirectional magnetic concentrator-type Lamb wave electromagnetic acoustic transducer, which belongs to the field of ultrasonic nondestructive testing, and can excite a single-mode S that propagates along a 360° direction in a plate structure. 0 Modal guided waves. Background technique [0002] Due to the advantages of high strength, high corrosion resistance, good temperature resistance and high toughness of aluminum alloy sheets, aluminum alloy sheets are widely used in aerospace and various transportation and delivery devices, including aircraft, high-speed rail, rockets, etc. . It is mainly used in important parts of various devices, such as armor, core structural parts, skin and other core components. However, due to human error and limitations of processing technology, various defects, including cracks, inclusions, delamination and oxidation, will inevitably occur during actual processing and use, and these defects will c...

Claims

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Application Information

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IPC IPC(8): B06B1/04G01N29/34
CPCB06B1/0215B06B1/04B06B2201/54G01N29/34
Inventor 刘增华邓黎明张永琛何存富吴斌
Owner BEIJING UNIV OF TECH
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