Jang, Minsu Kim, Jun Sik Um, Soong Ho Yang, Sungwook Kim, Jinseok 2024-01-19T20:34:42Z 2024-01-19T20:34:42Z 2021-09-02 2019-02-04 1094-4087 https://pubs.kist.re.kr/handle/201004/120362 Measuring high curvatures is essential in various applications such as structural engineering, medical treatment, and robotics. Herein, we present a novel ultra-high curvature sensor with an ultra-thin and highly flexible structure incorporating fiber Bragg gratings (FBGs). The sensor can measure curvature of bidirectional bending up to 200 m(-1). In addition, the multi-bend curvature sensor in conjunction with the proposed calibration scheme enables the accurate reconstruction of a curve with varying curvature. The sensitivity and the accuracy of the curvature sensor are investigated for different sensor designs. Finally, we demonstrate the accurate shape sensing of various 2-D patterns using the multi-bend curvatures sensor. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement English OPTICAL SOC AMER Ultra-high curvature sensors for multi-bend structures using fiber Bragg gratings Article 10.1364/OE.27.002074 1 OPTICS EXPRESS, v.27, no.3, pp.2074 - 2084 OPTICS EXPRESS 27 3 2074 2084 scie scopus 000457585600028 2-s2.0-85060972663 Optics Optics Article Curvature Fiber Bragg Grating