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Coil autoexcitation electromagnetic ultrasonic lamb wave transducer

An electromagnetic ultrasonic, transducer technology used in the direction of fluids that utilize vibration

Active Publication Date: 2017-03-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problem that the traditional electromagnetic ultrasonic transducer needs a strong magnet to provide a static magnetic field, the present invention designs a coil self-excitation transducer

Method used

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  • Coil autoexcitation electromagnetic ultrasonic lamb wave transducer
  • Coil autoexcitation electromagnetic ultrasonic lamb wave transducer
  • Coil autoexcitation electromagnetic ultrasonic lamb wave transducer

Examples

Experimental program
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Embodiment Construction

[0021] The self-excited transducer is designed as image 3 shown. image 3 The small picture in the upper right corner of the center shows the coil winding method of the self-excited transducer. A copper enameled wire with a diameter of 0.03mm to 2mm is selected for linear winding on a cylindrical plastic 3D printed plastic model. The diameter of the 3D printed model ranges from 10mm to 50mm. , the height range is 3mm to 50mm, and the number of coil winding turns is 3 to 15 turns. The product of the excitation pulse current frequency and the thickness of the ferromagnetic sheet is less than 1.5MHz·mm to ensure that only S 0 and A 0 Lambo. The energy conversion process is carried out between the coil and the ferromagnetic plate to be tested, such as image 3 shown. The x-axis represents the upper surface of the ferromagnetic sheet, the positive half-axis of the y-axis represents the air domain, and the negative half-axis of the y-axis represents the interior of the ferroma...

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Abstract

The invention relates to a novel electromagnetic ultrasonic transducer. Compared with traditional transducers, the largest difference in design is that the novel electromagnetic ultrasonic transducer can supply a static magnetic field without the need of a magnet, a strongly dynamic magnetic field is generated by a linearly wound coil through excitation of large current, and the dynamic magnetic field and a ferromagnetic plate achieve ultrasonic lamb wave excitation through magnetic coupling. Most of the traditional transducers are excited through lorentz force or magnetostrictive force under static magnetic fields, and the novel electromagnetic ultrasonic transducer achieves ultrasonic wave excitation through lorentz force and magnetostrictive force under the dynamic magnetic field. The newly designed transducer can achieve transduction in a lift-off distance range of 0-9 mm and is superior to the traditional electromagnetic ultrasonic transducers in lift-off performance.

Description

technical field [0001] The invention designs a novel electromagnetic ultrasonic transducer, which uses a ferromagnetic plate as a detection object. Compared with the traditional electromagnetic ultrasonic transducer, the biggest feature is that it does not need a magnet to provide a static magnetic field. The newly designed transducer can be used in defect detection, metal texture measurement, plate thickness measurement and other fields. Background technique [0002] Electromagnetic Acoustic Transducer (EMAT for short) is a non-contact ultrasonic testing device. The device relies on electromagnetic coupling to directly form an ultrasonic sound source inside the test piece, so the electromagnetic ultrasonic transducer can be applied in high temperature on-line detection. In addition, the electromagnetic ultrasonic transducer also has the characteristics of low cost and can excite various types of ultrasonic waves through structural design. The transducing mechanism of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/08
CPCB06B1/08B06B2201/58
Inventor 徐科何健鹏周鹏任威平
Owner UNIV OF SCI & TECH BEIJING
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