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- W4387569924 abstract "In this paper, a D-shape fiber long period fiber grating (DLPFG) curvature sensor has been theoretically and experimentally investigated. Different from previous reported long period fiber grating (LPFG) curvature sensor based on D-shape single mode fiber (SMF), the fabrication of DLPFG is divided into two steps: LPFG with a low coupling efficiency is firstly written on a SMF by high-frequency CO2 laser, and then the grating area is subsequently polished to induce deeper resonance peaks and D-shape structure simultaneously. The polishing greatly enhances the fiber asymmetric modulation and thus results in the improvement of curvature sensitivity. Experiments show that the DLPFG has a high curvature sensitivity of 17.6 nm/m-1 and -11.9 nm/m-1 in two opposite directions within the plane perpendicular to CO2 laser-irradiated direction, which has exceeded that of the other reported LPFGs based on D-shape SMF. Besides, the temperature sensitivity is 45 pm/°C in range of -20 °C to 50 °C, and the temperature cross sensitivity is 2.58×10-3 m-1/°C. Therefore, this proposed DLPFG sensor with advantages of low-cost, easy-fabrication, high-reproducibility and high-sensitivity is promising for curvature measurement." @default.
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- W4387569924 date "2023-10-01" @default.
- W4387569924 modified "2023-10-13" @default.
- W4387569924 title "Curvature sensor based on D-shape fiber long period fiber grating inscribed and polished by CO2 laser" @default.
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- W4387569924 doi "https://doi.org/10.1016/j.measurement.2023.113665" @default.
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