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. 2008 Oct 15;8(10):6396–6406. doi: 10.3390/s8106396

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© 2008 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — The operational principle of the described implantable sensor. (a) In the absence of the permanent magnet, the soft magnetic material generated a symmetrical 2^nd order harmonic field as a function of the applied DC field. (b) The placement of a permanent magnet, which created a secondary DC field (biasing field), shifted the harmonic field pattern. (c) As the separation distance between the two magnetic elements decreased, the secondary biasing field experienced by the soft magnetic material increased. This further increased the shift of the harmonic field pattern.