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Omni-directional shear horizontal (SH) guided wave electromagnetic ultrasonic transducer

An electromagnetic ultrasonic and transducer technology, which is applied in the direction of material analysis, instruments, and scientific instruments using sonic/ultrasonic/infrasonic waves, and can solve the problems of ferromagnetic materials and non-conductive materials to stimulate ultrasonic waves

Active Publication Date: 2012-09-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can only excite Lamb waves, and cannot excite ultrasonic waves on ferromagnetic materials and non-conductive materials

Method used

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  • Omni-directional shear horizontal (SH) guided wave electromagnetic ultrasonic transducer
  • Omni-directional shear horizontal (SH) guided wave electromagnetic ultrasonic transducer
  • Omni-directional shear horizontal (SH) guided wave electromagnetic ultrasonic transducer

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0024] like figure 1 and figure 2 As shown, an omnidirectional SH guided wave electromagnetic ultrasonic transducer includes an annular iron-nickel alloy strip 4 with an opening. In this embodiment, the thickness of the alloy strip 4 is 0.2 mm, and the opening width is 0.5 mm.

[0025] A folded coil 1 coated with an insulating coating on the surface is built on the PCB substrate 2. After the current is passed into the folded coil 1, the currents of adjacent wires are reversed, and the currents in the separated wires are in the same direction. In this embodiment, each wire of the folded coil 1 is a 3-split split wire, and the radial distance between the centers of two adjacent wires is d=λ / 2, where λ is the SH guided wave mode used at the current frequency wavelength at f.

[0026] Paste the folded coil 1 on one side of the alloy strip 4 w...

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Abstract

An omni-directional shear horizontal (SH) guided wave electromagnetic ultrasonic transducer comprises an annular ferronickel belt with an opening, wherein the ferronickel belt is pre-magnetized through a permanent magnet or electromagnet, a meandered line coil is adhered to one surface of the ferronickel belt, and the end portion of the meandered line coil is located at the position of the opening of the ferronickel belt. Each lead wire in the meandered line coil is a single-turn lead wire or a 2-4-split split type lead wire. The radial distance between centers of adjacent lead wires in the meandered line coil is d, and d=lambada / 2, wherein lambada is the wavelength of the SH guided wave mode which is used at the current frequency f. The omni-directional SH guided wave electromagnetic ultrasonic transducer is applicable to defect detecting and health monitoring of various uniform and isotropic elastic plate structures including conducting materials and non-conducting materials.

Description

technical field [0001] The invention belongs to the technical field of plate defect detection and health monitoring, and in particular relates to an omnidirectional SH guided wave electromagnetic ultrasonic transducer. Background technique [0002] Plates are commonly used in various industries to build building structures and facilities. These plates may contain defects caused during the production process before leaving the factory, and may also produce various defects caused by factors such as the environment and stress fatigue after leaving the factory and after a long period of use. It is necessary to actively detect the defects that may be contained in these plate structures in time, so as to avoid further expansion of defects or even breakage, ensure the integrity of buildings and facilities established by them, and ensure the safety and smoothness of people's production and life. conduct. In addition, a long-term monitoring mechanism can also be considered to contin...

Claims

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Application Information

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IPC IPC(8): G01N29/24
Inventor 王珅黄松岭赵伟魏争陈俊杰
Owner TSINGHUA UNIV
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