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A Method for Measuring the Wall Thickness of Metal Pipeline Using Electromagnetic Eddy Current Method

A metal pipeline and electromagnetic eddy current technology, which is applied in the direction of electromagnetic measuring devices, using electromagnetic means, and electric/magnetic thickness measurement, can solve the problems of reducing the detection speed of pipelines, achieve the effect of improving measurement accuracy and reducing the amount of calculation

Active Publication Date: 2020-02-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The detection mode with coaxial coils can achieve good detection of full circumferential defects, but cannot accurately detect the specific position and depth of semi-circumferential defects, 1 / 4 circumferential defects or smaller local defects, because the coaxial detection mode The lower detection signal reflects the average wall thickness of the pipe wall for a week
If the receiving coil is placed close to the pipe wall, the positioning and quantitative detection accuracy of local defects can be improved, but this will inevitably require more detection times to complete the overall detection of the circumferential wall thickness of the pipeline, which reduces the detection speed of the pipeline

Method used

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  • A Method for Measuring the Wall Thickness of Metal Pipeline Using Electromagnetic Eddy Current Method
  • A Method for Measuring the Wall Thickness of Metal Pipeline Using Electromagnetic Eddy Current Method
  • A Method for Measuring the Wall Thickness of Metal Pipeline Using Electromagnetic Eddy Current Method

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Embodiment

[0038] figure 1 It is a schematic diagram of a method for detecting the wall thickness of a metal pipeline by using the electromagnetic eddy current method of the present invention.

[0039] In this example, if figure 1 Shown, a kind of method of the present invention utilizes electromagnetic eddy current method to detect metal pipeline wall thickness, comprises the following steps:

[0040] S1. The influence of pipe wall thickness on the detection signal phase is analyzed by ANASY simulation. As the pipe wall thickness increases, the amplitude of the detection signal decreases gradually, and the phase lag increases gradually. If the pipe wall thickness continues to increase, in the process of calculating the phase each time, if the phase at the current moment is greater than 330°, and the phase at the next moment is less than 30°, it means that the phase lag at this moment is greater than 360°. The phase lag is equal to the phase lag when the tube wall is thin. This phenom...

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Abstract

The invention discloses a method for detecting the wall thickness of a metal pipeline by using the electromagnetic eddy current method, firstly performing phase unwrapping through the phase unwrapping equation, and then calculating the phase θ after unwrapping an and theoretical phase value θ th The error between θ e , and construct the relationship between the magnetic permeability μ and the electrical conductivity σ of the metal pipe wall Ψ 0 , and then perform fitting, and finally calculate the wall thickness of the metal pipe after simulation compensation according to the fitting curve.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and more specifically relates to a method for detecting the wall thickness of a metal pipeline by using an electromagnetic eddy current method. Background technique [0002] Electromagnetic eddy current array detection technology has the advantages of fast detection speed, wide coverage and high test accuracy. In recent years, with the development of sensor technology, the research and application of electromagnetic eddy current array sensor detection technology has been greatly developed, and it is widely used in non-destructive testing of aerospace components and oil and gas pipelines. [0003] In the research of pipeline far-field eddy current detection, the receiving coil and the transmitting coil are coaxially arranged at the central axis of the pipeline. The detection mode with coaxial coils can achieve good detection of full circumferential defects, but cannot accurately d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/06
CPCG01B7/10
Inventor 张伟师奕兵王志刚李焱骏孙虎高旭阳李志鹏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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