Jang, Minsu Choi, Jae Ho Kim, Jun Sik Song, Yong-Won Song, Kwang Yong Kim, Jinseok 2024-01-19T17:04:33Z 2024-01-19T17:04:33Z 2021-09-05 2020-07 1077-260X https://pubs.kist.re.kr/handle/201004/118463 We present a high-accuracy distributed bend sensor suitable for high-curvature structures based on Brillouin frequency measurement using a multi-fiber probe. Brillouin optical correlation domain analysis (BOCDA) with differential measurement is adopted for distributed strain sensing with a cm-order spatial resolution (minimum 1 cm), and a specially designed sensing probe embedding three optical fibers is used to enhance the minimum measurable bending radius and accuracy of bend sensing. Analysis on the reconstruction accuracy is performed for various spatial resolutions (10, 20, 30, 40 mm) and steps (1, 5, 10, 15, 20 mm) of the BOCDA system. Our results show that the maximum measurable curvature of three-dimensional bending is 143 m(-1), which is the highest curvature so far measured by Brillouin sensors in three-dimensional space, with about 0.7% of tip position error. Additionally, both pseudo-discrete sensing and fully distributed sensing are performed together to analyze the relation between the methods of sensing (discrete or distributed) and the accuracy of probing multi-bend curvatures according to the measurement step. English IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC STRAIN-MEASUREMENT BRAGG GRATINGS FIBER ROBOT High-Accuracy Distributed Bend Sensor Eligible for High-Curvature Structures Based on Brillouin Optical Correlation Domain Analysis Article 10.1109/JSTQE.2020.2989815 1 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, v.26, no.4 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 26 4 scie scopus 000542643800001 2-s2.0-85086460888 Engineering, Electrical & Electronic Quantum Science & Technology Optics Physics, Applied Engineering Physics Optics Article STRAIN-MEASUREMENT BRAGG GRATINGS FIBER ROBOT Optical fiber sensors Optical fibers Strain Scattering Spatial resolution Shape Multi-fiber optical sensor Brillouin optical correlation domain analysis three-dimensional shape measurement distributed fiber sensor