3D reconstructing of arbitrary defects with magnetic flux leakage testing signals

Li，Hong Mei1,2; Huang，Ran Ran2; Zhao，Chun Tian1,3; Yan，Jia2; Wang，Yu4

10.1109/FENDT50467.2020.9337538

2020-11-20

978-1-6654-4083-7

Proceedings of 2020 IEEE Far East NDT New Technology and Application Forum, FENDT 2020

51-55

20-22 Nov. 2020

Kunming, Yunnan province, China

By detecting and processing the Magnetic Flux Leakage (MFL) signals to identify and estimate the defects in ferromagnetic materials or structures, for example, in the steel pipelines, the so called Magnetic Flux Leakage Testing (MFLT) technology has been widely used in industry. However, the existing MFLT technology is suitable for locating the defects and rough estimating their sizes based on enormous sample data, incapable to image their Three-Dimensional (3D) shapes and precise estimate their sizes, while the physical model associating the defect geometry details and the MFL signals were still unclear. In this study, (1) the effects of an actual 3D defect are taken into account by introducing a new concept, Depth Field over a surface, i.e., a matrix of loss of material on the testing surface of a structure; (2) the governing equations for the depth field and the MFL signals are derived; (3) an algorithm to reconstruct the 3D defect or the depth field based on the governing equations is developed. This new method does not require huge amount of pulling-test data for calibration purpose as the existing MFLT technology used in industry, and it has been verified via a series of tests with various defects of different shapes in pipelines, the results indicate it is valid for 3D defect reconstruction with high accuracy.

Defect depth field Magnetic flux leakage testing Reconstruction algorithm Three-dimensional defect reconstruction

其他

英语

EI

20210809966708

Ferromagnetic materials ; Image reconstruction ; Magnetic leakage ; Pipelines

Pipe, Piping and Pipelines:619.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Magnetic Materials:708.4

2-s2.0-85101188505

Scopus

1.College of Architecture and Environment,Sichuan University,Chengdu,610207,China
2.Weihai Huateng Offshore Engineering Technology Co.,Ltd,Weihai,264400,China
3.Advanced Interdisciplinary Studies,Ocean-X Program,Southern University of Science and Technology,Shenzhen,518055,China
4.Nondestructive Testing and Structural Reliability Evaluation Laboratory,North Minzu University,Yinchuan,750021,China

Li，Hong Mei,Huang，Ran Ran,Zhao，Chun Tian,et al. 3D reconstructing of arbitrary defects with magnetic flux leakage testing signals[C],2020:51-55.