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Ultra-high curvature sensors for multi-bend structures using fiber Bragg gratings.
Optics Express 2019 Februrary 5
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.
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