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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
Published on: January 16, 2020
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A Study of Quantifying Thickness of Ferromagnetic Pipes Based on Remote Field Eddy Current Testing
Wei Zhang1,2, Yibing Shi3,4, Yanjun Li5,6
1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China. weizhang@uestc.edu.cn.
Sensors (Basel, Switzerland)
|August 26, 2018
Summary
Quantifying ferromagnetic pipe wall thickness using Remote Field Eddy Current Testing (RFECT) is challenging. This study calibrates RFECT signals considering permeability and conductivity variations, enhancing wall thickness measurement accuracy.
Area of Science:
- Materials Science
- Non-destructive Testing
Background:
- Remote Field Eddy Current Testing (RFECT) is sensitive to inner and outer wall defects in ferromagnetic pipes.
- Quantifying wall thickness in RFECT remains a significant challenge.
- A linear relationship exists between pipe wall thickness, permeability, conductivity, and the RFECT signal phase.
Discussion:
- Investigates the influence of pipe permeability and conductivity on RFECT signal phase.
- Employs univariate analysis and Finite Element Analysis (FEA) to study phase variations.
- Utilizes nonlinear fitting for calibration of phase variations.
Key Insights:
- Calibrates RFECT signal phase variations caused by differing permeability and conductivity couples when their product is constant.
- Multi-Frequency Eddy Current Testing (MFECT) is used to invert pipe permeability and conductivity.
- Compensates wall thickness quantification by accounting for material properties.
Outlook:
- Proposed methods validated through simulation signal analysis.
- Enhances the practical applicability of RFECT for ferromagnetic pipe inspection.
- Paves the way for more accurate non-destructive evaluation of pipe integrity.
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