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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 (http://creativecommons.org/licenses/by/4.0/).
(a) Optical fiber configuration and working principle; (b) construction and operation method of the fiber-optic curvature sensor with a “teeth-like” sensitive zone; (c) flexible optical fiber sensors (OFS)-based joint monitoring system configuration.