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Torsional mode magnetostrictive sensor, pipeline detection system and pipeline detection method

A torsional mode and magnetostrictive technology, applied in instruments, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, analyze materials, etc., can solve problems such as low detection efficiency, inconvenient installation and disassembly of sensors, and unsatisfactory excitation signals. The effect of convenient and quick installation, simple production method and low cost

Active Publication Date: 2018-09-07
TSINGHUA UNIV +1
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Problems solved by technology

However, in engineering applications, there are still problems such as inconvenient installation and disassembly of sensors, unsatisfactory excitation signals, and low detection efficiency. Therefore, optimizing the design of existing magnetostrictive sensors or developing new magnetostrictive sensors is still a research topic in this field. One of hotspots and difficulties

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  • Torsional mode magnetostrictive sensor, pipeline detection system and pipeline detection method
  • Torsional mode magnetostrictive sensor, pipeline detection system and pipeline detection method
  • Torsional mode magnetostrictive sensor, pipeline detection system and pipeline detection method

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Embodiment Construction

[0038] The present invention will be described in further detail below with reference to the accompanying drawings, but the torsional mode magnetostrictive sensor of the present invention is not limited to the embodiments.

[0039] Such as figure 1 As shown, a torsional mode magnetostrictive sensor according to the present invention includes a coil array 1 and a permanent magnet array 2 . The coil array 1 includes a plurality of coils 11 uniformly arranged in parallel on the outer circumferential surface of the pipeline 3 along the circumferential direction. For example, if figure 2 The coil array 1 shown includes eight coils 11 connected in parallel to provide a dynamic alternating magnetic field along the circumference of the pipeline 3 . The permanent magnet array 2 includes a plurality of permanent magnets 21 uniformly arranged on the radially outer side of the coil array 1 along the circumferential direction, wherein each permanent magnet 21 is polarized radially along...

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Abstract

The invention relates to a torsional mode magnetostrictive sensor, a pipeline detection system and a pipeline detection method, and belongs to the technical field of ultrasonic detection. The magnetostrictive sensor includes a coil array and a permanent magnet array. The coil array is formed by connecting a plurality of racetrack coils in parallel, and the racetrack coils are fixed surrounding theouter surface of a pipeline, and are uniformly distributed along the circumference of the pipeline; the permanent magnet array is formed by permanent magnets which are staggered in polarity and a magnet base, and is mounted on the outer side of the coil array, and a spacing between the axially adjacent permanent magnets is equal to the half wavelength of an excited torsional mode guided wave; andthe pipeline ultrasonic guided wave in a torsional mode is excited on the basis of a magnetostrictive mechanism under the coaction of an axial static bias magnetic field provided by the permanent magnet array and a circumferential dynamic magnetic field provided by the coil array. The torsional mode magnetostrictive sensor has the advantages of effectiveness in exciting and receiving ultrasonic guided waves in the torsional mode in a steel tube, single excited mode, high signal-to-noise ratio, and convenience in for realizing comprehensive detection of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and in particular relates to a torsional mode magnetostrictive sensor, a pipeline testing system and a method. Background technique [0002] Ultrasonic guided wave testing technology has the advantages of long ultrasonic propagation distance, low sound wave attenuation rate, and can cover most of the detection range in a short time. It has been widely used in the field of non-destructive testing of pipelines in recent years. Among them, the axisymmetric torsional mode is a more commonly used detection mode in the pipeline ultrasonic guided wave, and its advantage is that the propagation speed of the guided wave in this mode is basically not affected by frequency changes within a certain frequency range, that is, it has good The non-dispersive characteristics of the particle; the vibration direction of the particle is perpendicular to the propagation direction of the guid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0289
Inventor 孙斐然孙振国陈强张文丁雨林
Owner TSINGHUA UNIV
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