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Pipeline elbow detection method based on remote field eddy current and detection device

A technology for pipe elbows and far-field eddy currents, applied in the direction of material magnetic variables, etc., can solve problems such as pipe elbow defects, pipe elbow detection, etc., achieve the same sensitivity, easy defect resolution, and reduce detection blind spots

Inactive Publication Date: 2016-01-13
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome various deficiencies existing in the prior art, and to provide a method that utilizes double excitation to narrow the far-field area, increase the amplitude of the measured signal, fully reflect the advantages of far-field eddy current detection, and solve the problem of internal penetration. Far-field eddy current-based detection method and detection device for pipe elbow defects

Method used

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  • Pipeline elbow detection method based on remote field eddy current and detection device
  • Pipeline elbow detection method based on remote field eddy current and detection device
  • Pipeline elbow detection method based on remote field eddy current and detection device

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1, see Figure 1-3 , The far-field eddy current sensor is arranged on the cross section of the pipe elbow 1; the excitation unit includes an excitation coil 3, the receiving unit includes a receiving coil 4, the axis of the excitation coil 3 is arranged along the circumference of the pipe elbow 1, and the receiving coil 4 The axis is arranged along the radial direction of the pipe elbow; the receiving coil 4 is located in the far-field area for measuring the indirect coupling magnetic field signal; a harmonic excitation is applied to the sensor excitation coil 3, and the changing excitation field causes a circumferential distribution along the cross section of the pipe elbow 1. The receiving coil 4 in the receiving unit is located in the far-field area to measure the indirect coupling magnetic field signal. The circumferential movement sensor scans the pipe elbow. The phase difference of the measured signal relative to the excitation signal indicates corrosion or c...

Embodiment 2

[0037] Example 2, see image 3 , The far-field eddy current sensor of the present invention is sequentially connected with the harmonic signal excitation circuit, signal processing circuit, A / D conversion circuit and computer. The harmonic signal excitation circuit provides harmonic excitation for the far-field eddy current sensor. On the outer surface of the pipe elbow, the eddy current is induced by excitation and the indirect coupling magnetic field signal is received in the far field area of ​​the eddy current, which is converted into a voltage signal and transmitted to the signal processing circuit. The signal processing circuit amplifies, filters, and After comparison, they are sent to the A / D conversion circuit. The A / D conversion circuit converts the analog signal into a digital signal and sends it to the computer. The computer processes the received data to obtain the corrosion and crack defect information of the tested pipe elbow. Refer to Figure 1 to Figure 5 , The r...

Embodiment 3

[0038] Example 3, see Figure 1 to Figure 5 The pipeline elbow detection device of the present invention consists of a far-field eddy current sensor 2 composed of two identical excitation units and one receiving unit, and the two excitation units are respectively located on both sides of the receiving unit. The excitation unit includes an excitation coil 3, the receiving unit includes a receiving coil 4, the axis of the excitation coil 3 is arranged along the circumferential direction of the pipe elbow 1, the axis of the receiving coil 4 is arranged along the radial direction of the pipe elbow, and the receiving coil 4 is located in the measuring direction. The far field region of the coupled magnetic field signal. The far-field eddy current sensor 2 includes a housing 13, an end cover 11, an excitation coil 3, a receiving coil 4, and a socket. The socket may adopt the structure of an aviation socket 9 or other structures; the housing 13 is provided with an inner The cavity has...

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Abstract

A pipeline elbow detection method based on remote field eddy current and a detection device. The invention mainly solves the technical problem that the existing eddy current detection for pipeline elbow has blind zone or poor probe traversability. The technical scheme is as below: a remote field eddy current sensor including two identical exciting units and a receiving unit is employed, and the two exciting units are located on both sides of the receiving unit; the exciting units and receiving unit are arranged along the circumferential direction of the pipeline elbow cross section; the receiving unit area is located in the remote field area for measurement of indirect coupled magnetic field signal; when the remote field eddy current sensor applies harmonic excitation, double excitation is used to zoom in the remote field area to improve the signal amplitude; the sensor scans along the circumferential direction of the pipeline elbow to measure the phase difference between the signal received by the receiving unit and the excitation signal, so as to obtain change characteristics of the phase difference, namely the corrosion and crack information of the pipeline elbow. The method and device mainly use remote field eddy current principle and can be applied to pipeline elbow defect detection.

Description

Technical field [0001] The invention relates to an electromagnetic nondestructive detection method, in particular to a detection method and a special device for corrosion or crack defects at the elbow of a pipeline based on far-field eddy current. Background technique [0002] Pipelines are widely used in many industries such as oil and gas, chemical industry, electric power and heating. Pipe elbows are an indispensable part of the pipeline system. Most pipe elbows are affected by high temperature, high pressure and complex external environment during work, and the inner surface of the outer surface of the pipe elbow is always scoured by the medium during use, resulting in erosion and corrosion and thinning of the pipe wall. In addition, under high temperature and pressure, the pipe wall of the pipe elbow is prone to cracks. The above defects are easy to expand rapidly under high pressure, causing the pipe wall at the pipe elbow to crack, which in turn leads to leakage accidents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
Inventor 徐志远林章鹏李海超谭援强
Owner XIANGTAN UNIV
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