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Electromagnetic ultrasonic transducer for exciting torsional guided wave in pipe and working method thereof

An electromagnetic ultrasonic and transducer technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, generation of ultrasonic waves/sonic waves/infrasonic waves, instruments, etc., can solve problems such as difficult identification of detection signals

Pending Publication Date: 2018-11-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the figure that there are multi-order guided waves in the guided waves of each mode under different excitation frequencies, especially the guided waves of the bending mode, which makes it difficult to identify the detection signal

Method used

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  • Electromagnetic ultrasonic transducer for exciting torsional guided wave in pipe and working method thereof
  • Electromagnetic ultrasonic transducer for exciting torsional guided wave in pipe and working method thereof
  • Electromagnetic ultrasonic transducer for exciting torsional guided wave in pipe and working method thereof

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Embodiment Construction

[0024] The present invention will be further explained below in conjunction with the drawings.

[0025] The electromagnetic ultrasonic transducer used for exciting the pipe torsion guided wave of the present invention includes a hinge 1, a permanent magnet 2, a graduated stud 3, a magnet clamping device 4, an excitation coil 5, a pipe to be tested 6 and a buckle 7. Such as image 3 As shown, the magnet holding device 4 is composed of two semicircles with a symmetrical structure. One end of the two semicircles is connected by a hinge 1 and the other end is connected by a buckle 7 to form a circle. The magnet holding device 4 is sleeved on the outside of the pipe 6 to be tested, the axis of the magnet holding device 4 coincides with the axis of the pipe 6 to be tested, and 12 permanent magnets 2 are embedded in the magnet holding device 4, so that the permanent magnets 2 along the pipe The measuring pipeline 6 is uniformly distributed in axial symmetry, the three graduation studs ...

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Abstract

The invention belongs to the field of ultrasonic non-destructive testing, and puts forward an electromagnetic ultrasonic transducer for exciting torsional guided wave in a pipe and a working method thereof. The transducer comprises a hinge, permanent magnets, a scale stud, a magnet clamping device, an exciting coil, a pipe to be tested and a buckle. Through the magnet clamping device, the permanent magnets can be axially symmetrically and evenly distributed along the pipe to be tested, thereby forming a magnetic field along the radial direction of the pipe to be tested in the pipe to be tested. A burst excitation signal along the axial direction of the pipe to be tested is introduced in the exciting coil. Under the action of the Lorentz force, a torsional guided wave propagating along theaxial direction will be generated in the pipe to be tested. The electromagnetic ultrasonic transducer can be widely applied in length measurement and damage and corrosion detection of tubular structures.

Description

Technical field: [0001] The invention relates to electromagnetic ultrasonic non-destructive testing technology, in particular to an electromagnetic ultrasonic transducer for exciting a torsional guided wave of a pipeline and a working method thereof. Background technique: [0002] Pipeline transportation is not only large, continuous, rapid, economical, safe, reliable, stable, but also has low investment, small area and low cost, and can realize automatic control. Therefore, it is widely used in long-distance transportation of oil, natural gas, ore, coal, building materials, chemicals and food. However, with the extension of pipeline working hours and the influence of various environmental factors (wind, sun, rain, snow, etc.), the pipeline will inevitably suffer damages such as corrosion, cracks, and fatigue. Therefore, it is necessary to regularly check the health of the pipeline. At present, the commonly used methods are: radiographic testing, penetrant testing, magnetic par...

Claims

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Application Information

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IPC IPC(8): G01N29/34G01N29/24
CPCG01N29/2412G01N29/34G01N2291/262G01N2291/0289
Inventor 张应红钱征华魏霄王彬胡天祥裴勇喆黄浩宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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