Permanent magnet-free omnidirectional SH wave electromagnetic ultrasonic transducer and design method thereof

An electromagnetic ultrasonic and transducer technology, which is used in material analysis using sonic/ultrasonic/infrasonic waves, generation of ultrasonic/sonic/infrasonic waves, instruments, etc.

Pending Publication Date: 2020-07-07
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultrasonic imaging has higher requirements for transducers. The traditional unidirectional SH wave transducer can no longer meet the needs of imaging. Therefore, it is urgent to develop a transducer that can

Method used

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  • Permanent magnet-free omnidirectional SH wave electromagnetic ultrasonic transducer and design method thereof
  • Permanent magnet-free omnidirectional SH wave electromagnetic ultrasonic transducer and design method thereof
  • Permanent magnet-free omnidirectional SH wave electromagnetic ultrasonic transducer and design method thereof

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Embodiment Construction

[0041] In order to make the purpose, technical solution and advantages of the SH wave electromagnetic ultrasonic transducer clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 As shown, an omnidirectional SH wave electromagnetic ultrasonic transducer without permanent magnets is mainly composed of two parts of PCB coils, including excitation coils and electromagnetic field coils. The excitation coil can have two or more layers, but it must be an even number of layers. The whole coil is divided into upper and lower parts. The bottom layer wraps around from the inside out. The lower part is similar to the upper part. The wires coming out of the bottom layer are wound from the outside to the inside. The innermost ring is connected to the top layer with vias, and then wound from the inside of the top layer coil to the outside. The essence of the upper and lower parts of the coil is one. ...

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Abstract

The invention discloses a permanent magnet-free omnidirectional SH wave electromagnetic ultrasonic transducer and a design method thereof. The transducer comprises two parts of PCB coils and an insulating layer. One part of the PCB coil is an electromagnetic field coil, is of an annular structure, is used for providing a bias electromagnetic field, and is composed of two layers of coils connectedend to end to form a closed loop. The other part of the PCB coil is a coil used for generating eddy current in a board, and two ends of the coil are respectively connected with an external lead. The insulating layer covers the head and tail ends of the PCB coil and is connected with the wire, and the wire is connected with an external power supply. The transducer can control the size of the generated magnetic field to meet the requirements of different detection conditions according to methods of controlling the size of the power-on current and the like. Because no magnet is needed, the volumeand the weight of the transducer are minimized. The transducer can be made of a PCB (Printed Circuit Board) circuit, can be made into a flexible circuit, and is suitable for measuring a tested piecewith an irregular surface and a tubular test piece.

Description

technical field [0001] The invention relates to ultrasonic testing technology in the field of non-destructive testing, in particular to an omnidirectional SH wave electromagnetic ultrasonic transducer without permanent magnets and a design method thereof. Background technique [0002] In the fields of structural health monitoring, guided wave tomography, and ultrasonic phased array inspection, the application of transducer arrays to large-area panel inspection has great prospects. Since the transducer is the basic element in the array system, a lot of research has focused on the development of various guided wave transducers in the field of non-destructive testing and structural health monitoring. [0003] Guided wave, that is, the Lamb wave and SH wave propagating in the plate, compared with the Lamb wave, due to the non-dispersive nature of the low-order SH0 mode, the propagation process is not affected by the fluid load, making the SH wave in the nondestructive testing A...

Claims

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Application Information

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IPC IPC(8): G01N29/34G01N29/22
CPCG01N29/22G01N29/34
Inventor 张应红刘文龙胡芷逸杨孟杰徐晋勇韩海媚高成唐亮唐焱侯毅恒林浩然
Owner GUILIN UNIV OF ELECTRONIC TECH
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