A highly sensitive curvature sensor based on Omega shaped long-period fiber grating

A compact Omega shaped long-period fiber grating (OS-LPFG) for vector bending measurement is proposed and investigated in this paper. This sensor is fabricated by periodically splicing single-mode fiber (SMF) and multi-mode fiber (MMF) into Omega shape to get the purpose of sensitivity enhancing. Th...

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Bibliographic Details
Published in:IEEE sensors journal 2023-04, Vol.23 (8), p.1-1
Main Authors: Li, Yuanyuan, Ma, Yiwei, Tian, Tian, Tan, Haoyang, Sun, Cuiting, Geng, Tao, Yuan, Libo
Format: Article
Language:English
Subjects:
Bending
Claddings
Crosstalk
Curvature
Directional bending sensor
Fiber gratings
Gratings (spectra)
LPFG
Miniature sensor
Optical fiber sensors
Optical fibers
Refractivity
Sensitivity
Sensitivity enhancement
Sensors
Splicing
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Summary:A compact Omega shaped long-period fiber grating (OS-LPFG) for vector bending measurement is proposed and investigated in this paper. This sensor is fabricated by periodically splicing single-mode fiber (SMF) and multi-mode fiber (MMF) into Omega shape to get the purpose of sensitivity enhancing. The proposed OS-LPFG can distinguish the bending direction and achieves the curvature sensitivities in X, Y, -X directions are 12.03 nm/m -1 , -69.95 nm/m -1 and -19.84 nm/m -1 at the range of 0 m -1 to 1.5 m -1 . Meanwhile, the sensor has a small temperature crosstalk of 0.0011 m -1 /°C at the temperature range of 20 °C to 110 °C. In addition, the sensor features a compact structure with the length of 1.5 mm due to the strong refractive index modulation induced by fabricating method, which proposes a feasible idea for compact fiber curvature sensor design.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2023.3252160