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Magnetic Sensor Angle Adjustment to Improve Corrosion under Insulation Detection.
Joseph Bailey1, Gideon J Gouws2, Nicholas Long1
1Robinson Research Institute, Victoria University of Wellington, P.O. Box 33436, Lower Hutt 5046, New Zealand.
Sensors (Basel, Switzerland)
|February 10, 2024
Summary
Corrosion under insulation (CUI) in chemical pipes is a major concern. New eddy current sensing methods using thin-film magnetic sensors improve CUI detection by optimizing sensor angle for enhanced sensitivity and defect resolution.
Area of Science:
- Materials Science
- Non-destructive Testing
- Chemical Engineering
Background:
- Corrosion under insulation (CUI) poses a significant risk to pipe infrastructure in the chemical processing industry.
- Traditional eddy current sensing methods face limitations in sensitivity due to the insulation layer, hindering early corrosion detection.
Purpose of the Study:
- To develop advanced eddy current sensing instrumentation and methods utilizing thin-film magnetic sensors for improved CUI detection.
- To investigate the critical influence of sensor angle relative to the radial magnetic field on corrosion detection sensitivity.
Main Methods:
- Finite element simulations were employed to model the magnetic field interactions.
- Experimental observations were conducted to validate simulation results and assess sensor performance.
- The study focused on analyzing the impact of sensor orientation on signal amplitude and defect depth estimation.
Main Results:
- A high sensitivity of defect depth estimation (11.2 mm/degree) was observed with small changes in sensor angle.
- Optimal sensor angles were identified to be between 0.5 and 4 degrees, avoiding radial alignment.
- Simulations indicate a potential corrosion depth resolution of 0.1 mm with the optimized sensor configuration.
Conclusions:
- Thin-film magnetic sensors and optimized sensor angles significantly enhance eddy current-based CUI detection.
- Precise control of sensor angle is crucial for achieving high-resolution corrosion depth measurement.
- The developed methods offer a promising solution for early and accurate detection of CUI in industrial piping.
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