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Omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor

A sensor and electromagnetic sound technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc. To be improved and other issues, to achieve the effect of ensuring the uniformity of the circumferential direction and the uniform distribution of the magnetic field

Active Publication Date: 2015-08-05
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

In 2014, Huang Songling et al. designed an omnidirectional A 0 Modal electromagnetic acoustic sensor, but the energy and signal-to-noise ratio of the sensor to excite the guided wave are low, and the singleness of the mode needs to be improved

Method used

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  • Omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor
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  • Omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor

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Embodiment Construction

[0026] 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.

[0027] like figure 1 , is the omnidirectional type A of the present invention 0 Schematic diagram of the structure of the modal Lamb wave electromagnetic acoustic sensor; including a cylindrical NdFeB magnet 1, a ring-shaped NdFeB magnet 2, a support sleeve 3, and a double-layer helical folded coil 4. Cylindrical NdFeB magnet 1 and ring-shaped NdFeB magnet 2 form a concentric pair of magnets, and the polarities at the same end are opposite, which can generate a static magnetic field uniformly distributed along the radial direction of the magnet. The double-layer helical folded coil 4 is placed at the bottom end of the pair of concentric magnets and is in close contact with it.

[0028] The cylindrical NdFeB magne...

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Abstract

The invention discloses an omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor, and belongs to the field of ultrasonic non-destructive testing. A double-layer spiral inflection coil structure is integrated in a flexible circuit board, and the omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor is designed and developed to excite single A0 modal Lamb waves in an aluminum plate. The developed electromagnetic acoustic sensor is verified by experiments, the single A0 modal Lamb waves can be excited in the aluminum plate, defects in the aluminum plate are detected by the sensor, and positioning precision is high. The developed electromagnetic acoustic sensor has fine frequency response characteristics according to verification by scanning frequency experiments, and the developed electromagnetic acoustic sensor has fine omnidirectional characteristics according to verification by omnidirectional characteristic testing experiments. By the aid of the developed omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor and an array combination imaging algorithm thereof, wide-range and high-efficiency defect imaging of a plate structure can be realized, and the sensor has great application values and potentials in the field of health monitoring and non-destructive evaluation for the plate structure.

Description

technical field [0001] The present invention is an omnidirectional A 0 The modal Lamb wave electromagnetic acoustic sensor belongs to the field of ultrasonic nondestructive testing, which can excite an omnidirectional single A in a plate structure 0 Modal Lamb waves. Background technique [0002] As a basic industrial raw material, sheet metal is widely used in aerospace, civil engineering, machinery and other fields. However, at present, defects such as cracks, delamination, and inclusions inevitably exist in the production process of metal sheets, so it is very necessary to use non-destructive testing technology to inspect their quality. Ultrasonic guided wave technology is an emerging non-destructive testing technology. Compared with traditional testing methods, it has the advantages of large detection range, high efficiency, and small attenuation. It is quite sensitive to structural surface defects and internal defects. Therefore, ultrasonic guided wave The technology...

Claims

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Application Information

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IPC IPC(8): G01N29/24G01N29/04
Inventor 刘增华胡亚男谢穆文吉美宁刘秀成何存富吴斌
Owner BEIJING UNIV OF TECH
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