Lightweight, High Performance Detection Method of Pipeline Defects Through Compact Off-Axis Magnetization and Sensing

This paper proposes a new lightweight, low cost, and high performance detection method of pipeline defects through compact off-axis magnetization and sensing. By deploying the magnetic sensor below the edge of the tiny magnet instead of its center, high magnetic sensitivity of defect detection can b...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.101950-101959
Main Authors: Jian, Li, Yu, Ge, Xinjing, Huang
Format: Article
Language:English
Subjects:
defect detection
Defects
Lightweight
magnetic field
Magnetic field measurement
Magnetic flux
Magnetic properties
Magnetization
Magnetometers
Pipeline
Pipelines
Polyurethane resins
Probes
Saturation magnetization
Sensitivity
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Summary:This paper proposes a new lightweight, low cost, and high performance detection method of pipeline defects through compact off-axis magnetization and sensing. By deploying the magnetic sensor below the edge of the tiny magnet instead of its center, high magnetic sensitivity of defect detection can be achieved while magnetic sensing saturation can be avoided. It is experimentally demonstrated that both the sensitivity and effective lift-off value of defect detections are significantly enhanced. For various defects of different sizes and shapes, the sensitivity of the proposed scheme is mostly enhanced by 2-12 times and sometimes up to 20 times, compared with passive magnetic detection; the effective lift-off values are as high as 6 mm-13 mm, which exceeds conventional magnetic detection methods and is also much larger than the thickness of the protective polyurethane layer on the probe required by a field pipeline detector. In addition, speed independence as for the detected magnetic characteristics makes the proposed probe particularly suitable for the pipeline detector whose moving speed is unstable. Finally, its capacity of detecting a real oil-stealing hole is experimentally demonstrated.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2930660