Electromagnetic ultrasonic lamb wave transducer based on magnetostrictive mechanism

An electromagnetic ultrasonic and transducer technology, which is applied in the direction of vibrating fluid, etc., can solve the problems of accidental injury of operators, violent collision between transducer and plate, etc.

Active Publication Date: 2017-06-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strong attraction between the magnet and the plate at a low lift-off distance can easily cause a violent collision between the transducer and the plate, and even cause accidental injury to the operator

Method used

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  • Electromagnetic ultrasonic lamb wave transducer based on magnetostrictive mechanism
  • Electromagnetic ultrasonic lamb wave transducer based on magnetostrictive mechanism
  • Electromagnetic ultrasonic lamb wave transducer based on magnetostrictive mechanism

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Embodiment Construction

[0020] The magnetostrictive transducer is designed as Figure 4 with Figure 5 shown. Figure 4 For the coil winding method, the copper enameled wire with a diameter of 0.03mm to 5mm is selected for linear winding on a cylindrical plastic 3D printed plastic model. The diameter of the 3D printed model ranges from 10mm to 100mm, and the height ranges from 3mm to 50mm. The number of coil winding turns is 3 to 80 laps. The position relationship among coil, magnet and ferromagnetic plate is as follows: Figure 5 Shown: The magnet is magnetized in the horizontal direction and placed directly above the 3D printing model to provide a horizontal static bias magnetic field for the ferromagnetic sheet. 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, and the coupling sc...

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Abstract

The invention relates to novel electromagnetic ultrasonic transducer design based on the magnetostrictive mechanism. Compared with traditional transducer design, the novel electromagnetic ultrasonic transducer design has the largest difference that a vertical linear coil and magnet separated structure is adopted. A magnet provides a horizontal static bias magnetic field for a system, and a linear winding coil is excited by large current to generate a strong dynamic magnetic field. Since a ferromagnetic material has the magnetostrictive performance, change of material strain is caused by change of a composite magnetic field composed of the static magnetic field and the dynamic magnetic field, and ultrasonic lamb wave excitation is achieved through high-frequency vibration caused by change of strain. Compared with a traditional linear electromagnetic ultrasonic transducer, a newly designed transducer can achieve transduction at a lift-off distance of 10 mm, and the lift-off performance index is superior to that of the traditional transducer.

Description

technical field [0001] The invention designs a novel electromagnetic ultrasonic transducer, which uses a ferromagnetic plate as a detection object. The excitation mechanism of the new transducer is mainly based on the magnetostrictive force. Compared with the traditional linear electromagnetic ultrasonic transducer, the biggest feature is that it adopts a vertical linear coil and magnet separation structure, which can be realized at a larger lift-off distance. Ultrasonic excitation has more practical application value. 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, and has non-contact characteristics. In addition, the electromagnetic ultrasonic tran...

Claims

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Application Information

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