An omnidirectional dual-mode lamb wave electromagnetic acoustic sensor

An electromagnetic sound and sensor technology, which is applied in the generation of ultrasonic/sonic/infrasonic waves, the use of sonic/ultrasonic/infrasonic waves for material analysis, instruments, etc. Neat and delicate coil arrangement

Active Publication Date: 2018-06-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, relatively single S 0 and A 0 Dual-mode sensors with modalities are rarely reported

Method used

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  • An omnidirectional dual-mode lamb wave electromagnetic acoustic sensor
  • An omnidirectional dual-mode lamb wave electromagnetic acoustic sensor
  • An omnidirectional dual-mode lamb wave electromagnetic acoustic sensor

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and examples, and the following examples are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present invention.

[0026] like figure 1 , is a structural schematic diagram of the omnidirectional dual-mode Lamb wave electromagnetic acoustic sensor of the present invention; it includes a cylindrical NdFeB magnet 1 and an FPC double-layer coil 2 . The cylindrical NdFeB magnet 1 is placed directly above the FPC double-layer coil 2, polarized along the thickness direction, and can generate a static magnetic field perpendicular to the surface of the structure. The FPC double-layer coil 2 adopts double-layer wiring, the upper layer is a spiral coil 3, and the lower layer is a ring-shaped coil 4.

[0027] The cylindrical NdFeB magnet 1 such as figure 1 As shown, the polarization is along the thickness direction, the diameter D is 25m...

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Abstract

An omnidirectional dual-mode Lamb wave electromagnetic acoustic sensor, the sensor is a double-layer coil structure integrated in a flexible circuit board, the upper layer is a helical coil, and the lower layer is a ring-shaped folded coil. It is verified by experiments that the electromagnetic acoustic sensor independently excites a single S0 and A0 mode Lamb wave in the aluminum plate, and the detection of defects in the aluminum plate is realized by using the sensor, and the positioning accuracy is high; through the frequency sweep experiment, the developed The electromagnetic acoustic sensor has good frequency response characteristics; through the omnidirectional test experiment, it is verified that the developed electromagnetic acoustic sensor can excite Lamb waves uniformly in the circumferential direction. Using the developed omnidirectional dual-mode Lamb wave electromagnetic acoustic sensor and its array combined with imaging algorithm and data fusion algorithm to perform data fusion of S0 mode and A0 mode detection defect results, it has great potential in the field of plate structure health monitoring and non-destructive evaluation. Great application value and potential.

Description

technical field [0001] The invention is an omnidirectional dual-mode Lamb wave electromagnetic acoustic sensor, which belongs to the field of ultrasonic non-destructive testing, and can respectively stimulate and receive relatively single S 0 and A 0 Modal Lamb waves. Background technique [0002] Ultrasonic guided wave technology is an emerging non-destructive testing technology, which has the advantages of large detection range, high efficiency, and small attenuation. It is quite sensitive to structural surface defects and internal defects, and can realize the In recent years, the effective detection has received extensive attention. Lamb waves are ultrasonic guided waves propagating in the plate. Dispersion and multimodality are the main properties of ultrasonic guided waves. Existing research results have shown that different modes of guided waves have different sensitivities to different types of defects due to different mode shapes and energy distributions in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/34G01N29/24
Inventor 刘增华胡亚男吉美宁谢穆文何存富吴斌
Owner BEIJING UNIV OF TECH
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