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. 2016 Sep 20;16(9):1529. doi: 10.3390/s16091529

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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The FE calculation results of the changing rate of magnetic flux density in the radial direction at 20 kHz: (a) the internal air zone; (b) the pipe wall; (c) the external air zone; (d) the 0–80 mm zone.

The FE calculation results of the changing rate of magnetic flux density in the radial direction at 20 kHz: (a) the internal air zone; (b) the pipe wall; (c) the external air zone; (d) the 0–80 mm zone.