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A multi-directional current acquisition system applied to pipeline detection by electric field fingerprint method

A pipeline detection and electric field fingerprinting technology, which is applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problem of uneven distribution of electric field lines, achieve accurate control, facilitate data analysis, and achieve accurate detection results Effect

Active Publication Date: 2018-02-13
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method that can realize voltage collection in all directions in the voltage collection area on the pipeline to be tested, so that defects in all directions in the pipeline can be accurately detected, At the same time, it overcomes the defect of uneven distribution of electric field lines when the two-point current is fed in, so that the detection accuracy is higher and it is applied to the multi-directional current acquisition system for electric field fingerprint method pipeline detection.

Method used

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  • A multi-directional current acquisition system applied to pipeline detection by electric field fingerprint method
  • A multi-directional current acquisition system applied to pipeline detection by electric field fingerprint method
  • A multi-directional current acquisition system applied to pipeline detection by electric field fingerprint method

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Embodiment 1

[0031] Such as figure 1 As shown, a multi-directional current collection system applied to pipeline detection by electric field fingerprint method includes a pipeline to be tested 1, a voltage collection area 2 is set on the outer surface of the corrosion-prone part of the pipeline to be tested 1, and in the current collection area 2 An acquisition matrix 3 composed of several capture electrodes 5 is provided.

[0032] In this field, a matrix means a rectangular array formed by several rows and columns of capture electrodes 5 . In this embodiment, the acquisition matrix 3 adopts a composite matrix composed of two sets of matrices, and adopts a square design. The composite acquisition matrix 3 includes an m*m square matrix in the outer circle, where m is the number of first capture electrodes 501 (indicated by white circles in the figure), and m is a natural number not less than 3. In a matrix composed of m*m first capture electrodes 501, a second capture electrode 502 (in th...

Embodiment 2

[0045] In the multi-directional current acquisition system applied to pipeline detection by electric field fingerprint method in this embodiment, the pipeline to be tested is included 1, and a voltage collection area 2 is arranged on the outer surface of the corrosion-prone part of the pipeline to be tested 1, and in the current collection area 2 An acquisition matrix 3 is set in the middle, and the acquisition matrix 3 also adopts a composite matrix composed of two sets of matrices.

[0046] The difference between this embodiment and embodiment 1 is: as Figure 6 As shown, in this embodiment, the acquisition matrix 3 adopts a rectangular design. The acquisition matrix 3 includes an m*n rectangular matrix in the outer circle, m and n are the numbers of the first capture electrodes 501, m and n are natural numbers not less than 3, and m≠n, in the rectangular matrix, The number of first capture electrodes 501 on the long side and the wide side is different, but the distance bet...

Embodiment 5

[0051] Such as Figure 11 As shown, the difference between this embodiment and Embodiment 3 is that in this embodiment, the capture electrodes 5 at the four corners of the acquisition matrix 3 are canceled, and the four sets of equalizers 8 are octagonal and non-nested. Set on the outer circle of acquisition matrix 3.

[0052] In this embodiment, after the capture electrodes 5 at the four corners of the acquisition matrix 3 are canceled, it can be ensured that in each acquisition direction, there are no capture electrodes that have no calculation reference value in each electric field line 7, that is, all capture electrodes 5 Computational acquisition values ​​are available in each current acquisition direction. In this embodiment, the specific working process and working principle are the same as those in Embodiment 3, and will not be repeated here.

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Abstract

The invention discloses a multi-directional current collection system used for detecting an electric field fingerprinting pipeline, and belongs to the field of technological equipment for pipeline corrosion detection. The multi-directional current acquisition system comprises a collection matrix (3) arranged on a pipeline to be detected (1), wherein each capturing electrode (5) is connected with a lead wire for leading out a signal. The multi-directional current acquisition system is characterized in that the collection matrix (3) is a compound matrix consisting of a plurality of collection sub matrixes; a plurality of groups of current input mechanisms and current output mechanisms are arranged on the outer circle of the collection matrix (3); each group of current input mechanism and current output mechanism respectively forms an electric field consisting of a plurality of parallel electric field lines (6); and the collection matrix (3) is integrally positioned in the electric field formed separately by each group of current input mechanism and current output mechanism. The multi-directional current collection system can collect voltage in each direction of the capturing electrodes in the voltage collection region of the pipeline to be detected, and the defect of non-uniform distribution of the electric field lines during two-point type current feeding-in is overcome, so that the detection precision is higher.

Description

technical field [0001] The invention relates to a multi-directional current acquisition system applied to pipeline detection by electric field fingerprint method, which belongs to the field of pipeline corrosion detection technology equipment. Background technique [0002] At present, the resistance probe method and polarization probe method are widely used to monitor the corrosion of pipelines online, but these methods can only detect indirect uniform corrosion, and have damage to the pipe wall. It can't do anything about the extremely harmful localized corrosion. Using the electric field fingerprint method to detect pipeline corrosion has the advantages of direct measurement, high accuracy and reliability, strong adaptability, and no damage to the pipeline wall. [0003] The basic principle of the electric field fingerprinting method is as follows: set up a voltage collection area at the corrosion-prone part of the pipeline to be tested, weld several capture electrodes in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/61
CPCG01N27/61
Inventor 蒋文春王宜金陈健飞樊户伟张兰刘文彬徐书根戴洪飞涂善东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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