Electromagnetic ultrasonic transducer capable of reducing echo of magnet

An electromagnetic ultrasonic and transducer technology, applied in the use of ultrasonic/sonic/infrasonic, ultrasonic/sonic/infrasonic generation, instruments, etc., can solve problems such as misjudgment and failure of the electromagnetic ultrasonic detection system to reduce effect of influence

Active Publication Date: 2010-05-05
哈尔滨零声科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This signal will be superimposed on the actual electromagnetic ultrasonic detection signal, which may cause the electromagnetic ultrasonic detection system to misjudge or even fail to work normally.

Method used

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  • Electromagnetic ultrasonic transducer capable of reducing echo of magnet
  • Electromagnetic ultrasonic transducer capable of reducing echo of magnet
  • Electromagnetic ultrasonic transducer capable of reducing echo of magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, combining figure 1 , the present invention is an electromagnetic ultrasonic transducer capable of reducing magnet echo, which is composed of a permanent magnet (1), a shielding layer (2), a transmitting and receiving coil (3) and a conductor test piece (4). The magnet (1) is pasted on the shielding layer (2), the shielding layer (2) is pasted on the transmitting and receiving coil (3), and the transmitting and receiving coil (3) is placed on the conductor test piece (4). The upper and lower surfaces of the permanent magnet (1) are polished to make the surface rough, and the permanent magnet is made into an arc shape on the ultrasonic reflection end surface, which can effectively scatter the ultrasonic signal propagating in the permanent magnet and reduce the impact on reception.

Embodiment 2

[0014] Example 2, combined with figure 2 , image 3 , the present invention is an electromagnetic ultrasonic transducer capable of reducing magnet echo. When used for thickness measurement, it consists of a permanent magnet (1), a shielding layer (2), a common coil for transmitting and receiving (3) and a conductor test piece (4 ), in which the permanent magnet is made into a semi-cylindrical shape, and the magnetic poles are shown in the figure. exist figure 2 In the transmission process, vertically incident ultrasonic waves will be generated inside the magnet. Most of the ultrasonic waves will be scattered when encountering the upper end surface. influences.

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Abstract

The invention belongs to the electromagnetic ultrasonic non-destructive testing field and discloses an electromagnetic ultrasonic transducer capable of reducing echo of magnet. The invention aims at solving the problem that reception is influenced by electromagnetic ultrasonic signal produced by the electromagnetic ultrasonic transducer in permanent magnet. A probe is composed of a permanent magnet, a shielding layer, a transmitting and receiving coil and a conductor test piece. By applying the shielding layer, intensity of ultrasonic signal produced by electromagnetic ultrasonic transducer in magnet can be effectively reduced, and by increasing surface roughness of permanent magnet and designing suitable permanent magnet shape, ultrasonic echo signal can be effectively dispersed, thus effectively reducing influence of ultrasonic wave produced in magnet on reception.

Description

(1) Technical field [0001] The invention relates to electromagnetic ultrasonic detection technology, in particular to an electromagnetic ultrasonic transducer capable of reducing magnet echo. (2) Background technology [0002] Electromagnetic acoustic transducer (EMAT for short) is a new type of ultrasonic transmitting and receiving device. The device does not need an acoustic coupling agent, does not need to pre-treat the surface of the test piece, has a simple structure, can easily excite various types of ultrasonic waves, and has broad application prospects. Usually, EMAT is mainly composed of 3 parts: transmitting and receiving coils, magnets and the test piece itself. In order to effectively transmit and receive ultrasonic waves, it is necessary for the magnet to provide a high-intensity magnetic field of more than 1T. The existing NdFeB permanent magnet has the characteristics of large magnetic energy product, small size, and no need to provide external energy. It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/02G01N29/34
Inventor 王淑娟李智超汪开灿蒋韬米武军信鹏皓翟国富
Owner 哈尔滨零声科技有限公司
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