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. 2017 Sep 7;7:10854. doi: 10.1038/s41598-017-11217-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Curvature sensing data for dual-capacitor sensor. The upper (ΔC ₂) and lower (ΔC ₁) capacitance changes as functions of curvature 1/r in (a) concave and (b) convex shape. (c) The difference of ΔC ₂ and ΔC ₁ versus 1/r for both convex and concave shape. Here, the square and circular dots are the measured data and the solid lines represent the theoretical calculations.