Abstract

Temperature variations affect the accuracy of fiber-optic shape sensors; thus, temperature compensation is particularly important. This study developed a temperature self-compensation algorithm and verified the measuring accuracy of shape sensors after temperature compensation. A multicore fiber Bragg grating (FBG) sensor array was calibrated to confirm the consistency of sensor characteristics, and the relationship between the curvature and wavelength shift of FBGs was studied. A variable-temperature experiment revealed the temperature sensitivity of the FBG sensors, and these results were used by the temperature self-compensation algorithm. Further, shape reconstruction before and after temperature compensation was studied. The deformed shapes of the multicore FBG sensor array under different bending conditions were reconstructed. The results obtained after temperature compensation show that the average error between the measured and the theoretical coordinate values as less than 0.33 mm, the maximum error as less than 5.61 mm, and the relative error as less than 3.50%. The proposed temperature self-compensation algorithm has excellent prospects for application to flexible structures.

© 2021 Optical Society of America

Durable shape sensor based on FBG array inscribed in polyimide-coated multicore optical fiber

Kirill Bronnikov, Alexey Wolf, Sergey Yakushin, Alexandr Dostovalov, Olga Egorova, Sergey Zhuravlev, Sergey Semjonov, Stefan Wabnitz, and Sergey Babin
Opt. Express 27(26) 38421-38434 (2019)

Temperature-compensated fiber-optic online monitoring methodology for 3D shape and strain of near-space airship envelope

Guangkai Sun, Mohan Li, Yuanfeng Wang, Kangpeng Zhou, Xuewen Hu, Zhi Guo, and Lianqing Zhu
Appl. Opt. 61(31) 9279-9295 (2022)

Separation method of bending and torsion in shape sensing based on FBG sensors array

Xinhua Yi, Xiangyan Chen, Hongchao Fan, Fei Shi, Xiaomin Cheng, and Jinwu Qian
Opt. Express 28(7) 9367-9383 (2020)

RETRACTED: Optical fiber shape sensing of polyimide skin for a flexible morphing wing

Guangkai Sun, Hong Li, Mingli Dong, Xiaoping Lou, and Lianqing Zhu
Appl. Opt. 56(33) 9325-9332 (2017)

Co-located angularly offset fiber Bragg grating pair for temperature-compensated unambiguous 3D shape sensing

Dingyi Feng, Jacques Albert, Yueguo Hou, Biqiang Jiang, Yajun Jiang, Ying Ma, and Jianlin Zhao
Appl. Opt. 60(14) 4185-4189 (2021)