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Pulsed Magnetic Flux Leakage Measurement using Magnetic Head and Tunnelling Magnetoresistance for Defect Detection

Lookup NU author(s): Emmanuel Ibrahim, Changrong YangORCiD, Professor Gui Yun TianORCiD, Qiuping Ma, Dr Lawal Umar Daura

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Abstract

It is of great importance to improve the spatial resolution and sensitivity of magnetic flux leakage (MFL) sensors for small cracks characterisation on pipelines. To solve these problems, a novel pulsed magnetic flux leakage (PMFL) method, using magnetic head (MH) and a side placement of tunnelling magnetoresistance (TMR) is proposed. Two symmetrically inclined magnetic cores with a tiny air gap opening form a small detection region, making PMFL focus in that area. The side placement of the TMR ensures a reduction of noise and lift-off influence. A series of comparative tests with different kinds of artificial and natural cracks have been used to verify the high spatial resolution and sensitivity of the proposed method. The higher signal-to-noise ratio (SNR) and sensitivity of the side placement TMR were verified by two-dimensional (2D) and three-dimensional (3D) magnetic maps corresponding to the natural crack. The SNR and sensitivity of the side placement of TMR is greater than that of the under placement by an average of 41% and 160% respectively

Publication metadata

Author(s): Ibrahim ET, Yang C, Tian GY, Robinson M, Ma Q, Daura LU

Publication type: Article

Publication status: Published

Journal: IEEE Sensors Journal

Year: 2023

Volume: 23

Issue: 17

Pages: 19184-19193

Print publication date: 01/09/2023

Online publication date: 26/07/2023

Acceptance date: 26/07/2023

ISSN (electronic): 1558-1748

Publisher: Institute of Electrical and Electronics Engineers

URL: https://doi.org/10.1109/JSEN.2023.3297952

DOI: 10.1109/JSEN.2023.3297952

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