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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 (https://creativecommons.org/licenses/by/4.0/).
The 2-DOF angular displacement calculation model: (a) The schematic of the spherical capacitive sensor, (b) The schematic diagram of the cross-sectional of the spherical capacitive sensor.