Helical Long-Period Gratings in Four-Core Fiber for Multiparametric Monitoring of Directional Bending, Torsion and Temperature

• DOI: 10.1109/jlt.2022.3233252
• Publication Date: 2022-12-30T18:51:10Z
• Authors: Yunhe Zhao; Huiqin Peng; Yuehui Ma; Yunqi Liu; Yongsheng Yang; Zuyuan He
• Keywords: 0211 other engineering and technologies; 02 engineering and technology

We demonstrate the multiparametric monitoring of directional bending, torsion, and temperature based on helical long-period gratings (HLPGs) in a triangular four-core fiber (FCF) using CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser irradiation. The simulations investigated stress-relaxing effect stress-applying parts due to heating. In experiments, HLPGs with period 435 μm number 60 induced FCF have been for monitoring. bending sensing characteristics FCF-HLPGs exhibit that at curvature ranges A B, maximum sensitivities are −47.24 48.47 dB/m <sup xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> obtained −60°, respectively. And their show sine function behavior directions from −180° 180°. torsion sensitivity coupling efficiency variation is −0.16%/(rad/m) range −10 10 rad/m. wavelength 0.123 nm/°C, intensity response can be negligible. proposed potential practical application