Ring-core few-mode fiber and DPP-BOTDA-based distributed large-curvature sensing eligible for shape reconstruction

This study proposes a distributed large-curvature sensor based on ring-core few-mode fiber (RC-FMF) and differential pulse-pair Brillouin optical time-domain analysis (DPP-BOTDA). The RC-FMF is adhered to a thin steel substrate and an asymmetric hump shape is reconstructed using the Frenet-Serret al...

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Veröffentlicht in:Optics express 2022-11, Vol.30 (23), p.42553-42563
Hauptverfasser: Xu, Pengbai, Guo, Huapeng, Wang, Xiaolong, Shen, Lei, Wen, Kunhua, Sun, Yuehui, Ba, Dexin, Dong, Yongkang, Dong, Xinyong, Yang, Jun, Qin, Yuwen
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Sprache:eng
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Zusammenfassung:This study proposes a distributed large-curvature sensor based on ring-core few-mode fiber (RC-FMF) and differential pulse-pair Brillouin optical time-domain analysis (DPP-BOTDA). The RC-FMF is adhered to a thin steel substrate and an asymmetric hump shape is reconstructed using the Frenet-Serret algorithm. The proposed curvature sensor demonstrates a larger curvature-sensing range, excellent tolerance to bending-induced optical loss, and increased Brillouin gain coefficient. The proposed sensor also demonstrates longer sensing distance and continuous absolute measurement compared to other sensors. The proposed model can be applied to the end tracking of soft robotics and structural health monitoring of civil infrastructures.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.473974