<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This paper presents an inverse method for determining the conductivity distribution of a flat, layered conductor using a multi-frequency electromagnetic sensor based on phase signature alone. Eddy current sensors are used in a wide range of non-destructive testing (NDT) applications. Single frequency sensors are very common, however, the potential of an eddy current sensor with spectroscopic techniques offer the ability to extract depth profiles and examine more fully the internal structure of the test piece. In this paper, we found a simplified model that can estimate the phase signature of a cylindrical coil above a conductor with an arbitrary conductivity profile. This simplified model improves the computational efficiency by many fold compared to the complete analytic solution. For inverse solution, a simplex search method was used to fit a set of multi-frequency phase values in a least-squared sense. Experimental eddy-current tests are performed by taking the difference in inductance of the coil when placed in free space and next to a layered conductor over the range 100Hz -1MHz. Good estimates for the conductivity profile from experimental and simulated data were obtained</p></abstract>

This paper presents an inverse method for determining the conductivity distribution of a flat, layered conductor using a multi-frequency electromagnetic sensor based on phase signature alone. Eddy current sensors are used in a wide range of non-destructive testing (NDT) applications. Single frequency sensors are very common, however, the potential of an eddy current sensor with spectroscopic techniques offer the ability to extract depth profiles and examine more fully the internal structure of the test piece. In this paper, we found a simplified model that can estimate the phase signature of a cylindrical coil above a conductor with an arbitrary conductivity profile. This simplified model improves the computational efficiency by many fold compared to the complete analytic solution. For inverse solution, a simplex search method was used to fit a set of multi-frequency phase values in a least-squared sense. Experimental eddy-current tests are performed by taking the difference in inductance of the coil when placed in free space and next to a layered conductor over the range 100Hz -1MHz. Good estimates for the conductivity profile from experimental and simulated data were obtained

Determining The Step-Change Conductivity Profiles Within Layered Metal Structures Using Inductance Spectroscopy

International Journal on Smart Sensing and Intelligent Systems

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

This paper presents an inverse method for determining the conductivity distribution of a flat, layered conductor using a multi-frequency electromagnetic sensor...

Determining The Step-Change Conductivity Profiles Within Layered Metal Structures Using Inductance Spectroscopy

Published Online: Dec 13, 2017

Page range: 812 - 823

DOI: https://doi.org/10.21307/ijssis-2017-322

Keywords
Multi-frequency electromagnetic sensor, simplified model, conductivity distribution, layered conductor

© 2008 Wuliang Yin et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Determining The Step-Change Conductivity Profiles Within Layered Metal Structures Using Inductance Spectroscopy

Published Online: Dec 13, 2017

Page range: 812 - 823

DOI: https://doi.org/10.21307/ijssis-2017-322

KeywordsMulti-frequency electromagnetic sensor, simplified model, conductivity distribution, layered conductor

© 2008 Wuliang Yin et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Multi-frequency electromagnetic sensor, simplified model, conductivity distribution, layered conductor