Electromagnetic ultrasonic transducer with multi-phase structure and method for efficient excitation of ultrasonic waves

An ultrasonic and high-efficiency technology, which is applied in the direction of ultrasonic/sonic/infrasonic generation, can solve the problems of limited application, low energy conversion efficiency, and discrete information of detected surface defects, and achieves improved spatial density, efficient excitation, and one-way The effect of launching

Inactive Publication Date: 2016-06-08
XIAMEN UNIV
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  • Description
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Problems solved by technology

[0004] However, its limitation is that the amount of detected surface defect information that can be extracted is discrete, and it is difficult to locate the defect position on the surface and inside of the plate and estimate its damage; especially its energy conversion efficiency is low, and high-power pulse current is required to excite , which limits the application of the technique

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  • Electromagnetic ultrasonic transducer with multi-phase structure and method for efficient excitation of ultrasonic waves
  • Electromagnetic ultrasonic transducer with multi-phase structure and method for efficient excitation of ultrasonic waves
  • Electromagnetic ultrasonic transducer with multi-phase structure and method for efficient excitation of ultrasonic waves

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0027] refer to Figure 1-4 , an electromagnetic ultrasonic transducer with a multi-phase structure, comprising: a permanent magnet 10, a multi-phase EMAT coil 11, a measured ferromagnetic material 12, a signal source, and a multi-phase drive circuit; the permanent magnet 10 is placed in the Above the measured ferromagnetic material 12, the measured ferromagnetic material 12 is magnetized to provide a bias magnetic field in the horizontal direction;

[0028] The multi-phase EMAT coil is composed of n zigzag windings, n>1; preferably 3 phases in this embodiment, i.e. n=3; and placed on the surface of the tested ferromagnetic material to increase the space density of ultrasonic excitation ; The equidistant distance l between the folded wire windings is distributed on the plane of the EMAT coil;

[0029] The folded wire winding is composed of m layers of folde...

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Abstract

The invention relates to an electromagnetic ultrasonic transducer in a multiphase structure and an ultrasonic high-efficient excitation method by utilizing the electromagnetic ultrasonic transducer. By designing an EMAT excitation coil and a plurality of fold-line windings, the ultrasonic excitation space density can be improved, the fold-line winding is formed by multiple layers of inflection coils, by combining the current excitation staggered on the space and phase, the staggering relation is matched with the excitation phase, the ampere-turns in an excitation area can be effectively increased, the ultrasonic intensity is improved, and the high-efficient excitation and single-direction transmission of the ultrasonic can be realized. A permanent magnet is magnetized in the horizontal direction, the electronic ultrasonic transducer is suitable for the electromagnetic ultrasonic nondestructive detection of a detected article which is an iron magnetic material and based on the magnetostriction principle.

Description

technical field [0001] The invention relates to electromagnetic ultrasonic non-destructive testing, in particular to an electromagnetic ultrasonic transducer with a multi-phase structure. Background technique [0002] During the operation of natural gas pipelines, there will be defects such as corrosion and cracks, which seriously affect the safe operation of the pipelines, so the pipelines must be inspected to evaluate their safety. The detection of corrosion defects mainly uses magnetic flux leakage technology, while the detection of cracks generally uses ultrasonic testing technology. Piezoelectric ultrasonic detection requires a coupling medium, which is difficult to apply to the online detection of natural gas pipelines. [0003] Electromagnetic ultrasonic is a new technology in the field of non-destructive testing. It is attracting more and more attention due to its advantages of high precision, no need for couplant, non-contact, suitable for high temperature detectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/34
Inventor 吴德会黄一民李雪松杨秀淼
Owner XIAMEN UNIV
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