Imaging method and apparatus based on magnetic flux leakage testing

US10048226B2 · kind B2 · utility

Assignees

• TSINGHUA UNIVERSITY · CN
• SHENGLI OILFIELD BRANCH, CHINA PETROLEUM & CHEMICAL CO., LTD · CN
• DRILLING TECHNOLOGY RESEARCH INSTITUTE OF SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD · CN

Inventors

• Songling Huang · Beijing, CN
• Wei Zhao · Beijing, CN
• Shen-Ping Wang · Keelung, TW
• Huanquan Sun · Baofeng County, CN
• Laiju Han · Shandong, CN
• Shihua Zhang · Zhejiang, CN
• Yongtai Sun · Dongying, CN

Key dates

• Filing date: Dec 7, 2015
• Grant date: Aug 14, 2018
• Expiry date: Aug 8, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N17/04
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An imaging method and an imaging apparatus based on a magnetic flux leakage testing. The imaging method includes: selecting an imaging region having a corrosion defect on a pipeline to be tested; dividing the imaging region into a plurality of grid areas; scanning by a three-dimensional sensor array the pipeline to be tested so as to obtain magnetic flux leakage testing data; creating a three-dimensional orthogonal coordinate system in the imaging region, defining a first two-dimensional matrix of defect images according to the plurality of grid areas based on the three-dimensional orthogonal coordinate system, and creating a second two-dimensional matrix of magnetic flux leakage signals according to the magnetic flux leakage testing data based on the three-dimensional orthogonal coordinate system; and mapping the second two-dimensional matrix to the first two-dimensional matrix using a pre-trained wavelet neural network so as to image the corrosion defect.