Flexible-magnet-based electromagnetic surface acoustic wave transducer

A technology of surface wave and electromagnetic sound, which is applied in the analysis of solids by using sound wave/ultrasonic wave/infrasonic wave, material analysis by using sound wave/ultrasonic wave/infrasonic wave, instruments, etc. Strong effect and other problems, to achieve the effect of not easy to wear the coil

Active Publication Date: 2016-10-12
京智测维(北京)技术有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electromagnetic acoustic sensors usually use rigid permanent magnets, but the rigid permanent magnets have a strong adsorption effect on the rail, making it difficult to move, easy to wear the sensor, easy to absorb iron filings, and time-consuming and laborious to detect.
Moreover, rigid permanent magnets cannot be bent after forming, and it is difficult to fit curved or complex surfaces

Method used

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  • Flexible-magnet-based electromagnetic surface acoustic wave transducer
  • Flexible-magnet-based electromagnetic surface acoustic wave transducer
  • Flexible-magnet-based electromagnetic surface acoustic wave transducer

Examples

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Embodiment Construction

[0024] 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.

[0025] According to the principle of Lorentz force, an electromagnetic surface acoustic wave sensor based on a flexible magnet is designed, which includes a flexible NdFeB magnet 1, and a double-layer arc-shaped return coil 2 in a flexible circuit board. The detection object is a steel rail, and the installation is simple. Figure such as figure 1 shown. The sensor is simple to make and easy to assemble and disassemble.

[0026] In this example, when the electromagnetic surface acoustic wave sensor is installed, the flexible NdFeB magnet 1 and the arc-shaped return coil 2 are manually bent to fit the tread surface of the rail head 3 . The flexible neodymium-iron-boron magnet 1 can adsorb the arc-shaped return coil...

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Abstract

The invention discloses a flexible-magnet-based electromagnetic surface acoustic wave transducer, and belongs to the field of electromagnetic ultrasonic nondestructive detection. The transducer comprises a flexible magnet and a flexible cambered meandered coil. Compared with a rigid magnet, the flexible magnet is flexible and can be bent into a certain angle to be attached to a steel rail, so that the transducer is unlikely to be abraded when being used. When the cambered meandered coil is charged with alternating current, eddy current is generated on the surface of a test piece, and a surface wave signal is generated in the steel rail on the basis of the principle of Lorentz force under the action of a bias magnetostatic field provided by the flexible magnet. The flexible cambered meandered coil has a convex direction and a concave direction, the convex and concave directions of the flexible cambered meandered coil are selected by taking a required signal propagation direction as a reference to focus the energy of the generated surface wave signal towards a direction, and signal propagation unidirectionality is verified by experiments.

Description

technical field [0001] The invention belongs to the field of electromagnetic ultrasonic guided wave detection, and mainly relates to an electromagnetic acoustic surface wave sensor based on flexible magnets, which can excite surface waves in steel rails. Background technique [0002] As a mode of transportation in my country, railway transportation is widely used and economical and convenient. As an important component of railway tracks, steel rails are subject to impact and rolling during train operation, and are prone to defects such as cracks, wear and tear or even breakage during use, causing potential safety hazards. [0003] In order to ensure the safety of railways, it is necessary to carry out flaw detection on rails. Piezoelectric ultrasonic technology is often used at home and abroad. However, the piezoelectric ultrasonic technology needs to use a couplant that can match the acoustic resistance between the rail and the sensor, resulting in limited detection accura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34G01N29/04
CPCG01N29/041G01N29/34
Inventor 刘增华钟栩文谢穆文刘秀成吕炎何存富吴斌
Owner 京智测维(北京)技术有限公司
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