A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes
Abstract
:1. Introduction
2. 3D Hybrid Model of the Proposed Transducer
2.1. Static Magnetic Field
2.2. Dynamic Electromagnetic Field
2.3. Lorentz Force
2.4. EMF Signals
3. Corroboration and Simulations
3.1. Verification of the Hybrid Model
3.2. Simulations with External Corrosion
4. Experiments
5. Concluding Remarks
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Transducer Parameter | Value |
---|---|
Remanence field of the magnet, Brem (T) | 1.47 |
Position of the magnet upper surface, z1 (mm) | 2.0 |
Magnet height, z2 − z1 (mm) | 5.0 |
Magnet Radius, rm (mm) | 15.0 |
Inner radius of the bobbin coil, r1 (mm) | 15.4 |
Outer radius of the bobbin coil, r2 (mm) | 15.6 |
Height of the bobbin coil, 2zc (mm) | 3.0 |
Number of turns of the bobbin coil, N | 32 |
Radius of the induction coil, r0 (mm) | 2.0 |
Height of the induction coil, zin (mm) | 3.0 |
Number of turns of the induction coil, Nin | 30 |
Distance between the centers of the bobbin coil and induction coil, w0 (mm) | 13.3 |
Liftoff distance, d1 − r2 (mm) | 0.4 |
Pipe Parameter | Value |
---|---|
Inner radius, d1 (mm) | 16.0 |
Outer radius, d2 (mm) | 22.0 |
Conductivity, σ1 (MS·m−1) | 34.2 |
Relative permeability, μ1 | 1.0 |
Young’s modulus (GPa) | 71.7 |
Density (kg·m−3) | 2750 |
Poisson’s ratio | 0.33 |
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Share and Cite
Li, Y.; Cai, R.; Yan, B.; Zainal Abidin, I.M.; Jing, H.; Wang, Y. A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes. Sensors 2018, 18, 1733. https://doi.org/10.3390/s18061733
Li Y, Cai R, Yan B, Zainal Abidin IM, Jing H, Wang Y. A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes. Sensors. 2018; 18(6):1733. https://doi.org/10.3390/s18061733
Chicago/Turabian StyleLi, Yong, Rui Cai, Bei Yan, Ilham Mukriz Zainal Abidin, Haoqing Jing, and Yi Wang. 2018. "A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes" Sensors 18, no. 6: 1733. https://doi.org/10.3390/s18061733