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An omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer

A technology of magnetic concentration and transducers, which is applied in the generation of ultrasonic/sonic/infrasonic waves and the use of vibrating fluids to achieve the effect of improving the singleness of the mode

Active Publication Date: 2021-04-27
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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  • An omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer
  • An omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer
  • An omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer

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Experimental program
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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, which comprises a cylindrical neodymium-iron-boron magnet, a magnetic concentrator, and a circular array-type folded coil. Place the multi-cluster circular folded coils in the flexible circuit board on the surface of the aluminum plate to be tested, and place the magnetic concentrator directly above the folded coils after being attracted to the NdFeB magnet. Based on the Lorentz force effect, realize the omnidirectional S in the plate structure 0 Excitation of modal guided waves. It is verified by experiments that the developed array omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer can excite a single S in the aluminum plate. 0 Modal guided wave; Through the omnidirectional test experiment, it is verified that the developed omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer can excite S propagating along the 360° direction 0 Guided wave; Through defect detection experiments, it is verified that the omnidirectional magnetic concentrator Lamb wave electromagnetic acoustic transducer can effectively reduce the difficulty and error of defect signal analysis.

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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Patent Type & Authority Patents(China)
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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