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Double-coil electromagnetic ultrasonic transducer capable of eliminating electromagnetic interference

An electromagnetic interference and electromagnetic ultrasonic technology, which is applied in the generation of ultrasonic/sonic/infrasonic waves, ultrasonic/sonic/infrasonic waves, and the analysis of solids using sonic/ultrasonic/infrasonic waves. Transmission path and other issues to achieve the effect of eliminating electromagnetic interference and suppressing electromagnetic interference

Inactive Publication Date: 2019-11-26
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The design method of electromagnetic ultrasonic surface wave receiving transducer disclosed in Chinese patent CN103226630A is used to solve the problems of strong receiving noise and complicated processing in EMAT design
The EMAT uses metal shielding to weaken the transmission path of electromagnetic interference, and does not eliminate the electromagnetic interference of EMAT from the source

Method used

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  • Double-coil electromagnetic ultrasonic transducer capable of eliminating electromagnetic interference
  • Double-coil electromagnetic ultrasonic transducer capable of eliminating electromagnetic interference
  • Double-coil electromagnetic ultrasonic transducer capable of eliminating electromagnetic interference

Examples

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Embodiment Construction

[0041] The content of the above invention will be further described below in conjunction with specific embodiments. These examples are for illustrating the present invention and are not intended to limit the scope of the present invention.

[0042] see figure 1 , which is a cross-sectional view of the planar structure of the embodiment of the present invention, provides a double-coil electromagnetic ultrasonic transducer capable of eliminating electromagnetic interference, which includes a housing 1, a main permanent magnet 2, an auxiliary permanent magnet 3, a yoke 4, and a main excitation coil 5. An auxiliary excitation coil 6 and a partition 7; the main permanent magnet 2, the auxiliary permanent magnet 3, the yoke 4, the main excitation coil 5, the auxiliary excitation coil 6, and the partition 7 are all placed in the casing 1.

[0043] The main permanent magnet 2 is a rectangular NdFeB permanent magnet, the upper part is an N pole, and the lower part is an S pole. The p...

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Abstract

The invention discloses a double-coil electromagnetic ultrasonic transducer capable of eliminating electromagnetic interference. The double-coil electromagnetic ultrasonic transducer comprises an outer shell and further comprises a main permanent magnet, an auxiliary permanent magnet, a magnet yoke, a main exciting coil, an auxiliary exciting coil and a partition board. The main permanent magnet and the auxiliary permanent magnet are arranged side by side. The polarities of the main permanent magnet and the auxiliary permanent magnet are opposite. The main permanent magnet and the auxiliary permanent magnet communicate with the magnet yoke to form a magnetic circuit. The main exciting coil and the auxiliary exciting coil both belong to zigzag coils. The main exciting coil is located underthe main permanent magnet. The auxiliary permanent magnet is arranged under the auxiliary permanent magnet. The main exciting coil and the auxiliary exciting coil are connected in a series-opposing mode. The double-coil electromagnetic ultrasonic transducer generates a reverse alternating electromagnetic field through the auxiliary exciting coil under the condition of not affecting the ultrasonicexciting effect and can effectively eliminate electromagnetic interference generated by the main exciting coil.

Description

technical field [0001] The invention relates to the technical setting field of electromagnetic ultrasonic transducers, in particular to a novel double-coil electromagnetic ultrasonic transducer structure and technology, which can effectively eliminate the electromagnetic interference generated by the transducer during ultrasonic excitation. Background technique [0002] Electromagnetic ultrasonic transducer (Electro Magnetic Acoustic Transducer, EMAT) does not require couplant, does not require surface pretreatment of the test piece, and can adapt to special testing environments such as high temperature and high pressure; therefore, EMAT has been widely used in thickness measurement of steel or aluminum plates, train Wheel track flaw detection, oil pipeline flaw detection and other fields. [0003] According to the working principle of EMAT, a high-intensity alternating current needs to be passed through its internal excitation coil. Therefore, while EMAT excites ultrasound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/04G01N29/34G01N29/04G01B17/02
CPCB06B1/045G01B17/02G01N29/04G01N29/34G01N2291/0289G01N2291/262G01N2291/2623
Inventor 王晓红杨嘉欣黄超
Owner XIAMEN UNIV
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