Magnetostrictive patch type sensor capable of efficiently exciting spiral circumferential lamb waves and working method of magnetostrictive patch type sensor

A magnetostrictive and working method technology, applied in the direction of instruments, scientific instruments, processing detection response signals, etc., to achieve the effect of rapid pipeline defect detection

Pending Publication Date: 2021-12-10
FUZHOU UNIV
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  • Abstract
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Problems solved by technology

There is no non-destructive testing method that can quickly detect the axial position of the axial defect in the pipeline and evaluate the axial extent of the defect

Method used

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  • Magnetostrictive patch type sensor capable of efficiently exciting spiral circumferential lamb waves and working method of magnetostrictive patch type sensor
  • Magnetostrictive patch type sensor capable of efficiently exciting spiral circumferential lamb waves and working method of magnetostrictive patch type sensor
  • Magnetostrictive patch type sensor capable of efficiently exciting spiral circumferential lamb waves and working method of magnetostrictive patch type sensor

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specific example

[0115] Examples of axial defect localization by helically propagated circumferential Lamb waves:

[0116] 1) Paste the magnetostrictive material with a width of 50mm and a length equivalent to the circumference of the pipe on the pipe;

[0117] 2) A flexible printed coil that efficiently excites helically propagating circumferential Lamb waves is pasted on the magnetostrictive material;

[0118] 3) Using the self-excitation self-reception mode, the sine wave signal modulated by the 5-period Hanning window is input through the flexible printed coil that efficiently stimulates the helical propagation of the circumferential Lamb wave, and the received signal is collected;

[0119] 4) To observe the defect reflection signal, use the relationship between the axial propagation velocity of the helically propagated circumferential Lamb wave, the time corresponding to the defect reflection signal, and the axial position of the defect. The axial position of the axial defect is calculat...

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Abstract

According to the magnetostrictive patch type sensor capable of efficiently exciting the spiral circumferential lamb waves and the working method of the magnetostrictive patch type sensor, axial positioning is conducted on axial defects in a pipeline through the spiral propagation circumferential lamb waves, and meanwhile the axial range of the defects in the pipeline can be evaluated. In order to realize the positioning of the axial defect in the pipeline and the assessment of the circumferential range of the defect, the axial position of the defect is judged according to a defect reflection signal in a signal by utilizing the axial spiral propagation of the circumferential lamb wave sensitive to the axial defect, and the axial length of the defect is assessed by summarizing the number of the signal with the defect reflection. The method is realized by comparing a theoretical model with an experiment. In addition, the method supports a self-excitation and self-receiving measurement mode, and can adapt to the condition that only one end of the pipeline can be loaded with a sensor in engineering measurement.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, can be used for the location of axial defects in pipelines, and the evaluation of the axial range of defects in pipelines, and in particular relates to a magnetostrictive patch sensor for efficiently exciting helical circumferential Lamb waves and its working method. Background technique [0002] Pipelines can not only complete the transportation of liquid materials such as oil, natural gas, refined oil, chemical products and water, but also transport solid materials such as coal, flour, and cement. At present, the total length of pipelines in use in the world is 3.5 million kilometers, of which the number of old pipelines accounts for more than half. How to evaluate the condition of these pipelines to ensure safe and economical operation is the main problem to be solved by pipeline integrity evaluation technology. Leaks in pipeline transportation have a lower annual accident rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01N29/07G01N29/24G01N29/44
CPCG01N29/041G01N29/07G01N29/2412G01N29/4418G01N29/4472G01N2291/0289G01N2291/0423G01N2291/2634G01N2291/2636G01N2291/011
Inventor 方舟黄宴委
Owner FUZHOU UNIV
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