Jiang Peng, Xu Qiang, Zhang Rui, Bai Haiping, Li Kang, Copner Nigel, Gong Yongkang
College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721016, China.
Engineering Technology Research Center for Ultrafast Optics and Advanced Material of Baoji, Baoji, 721016, China.
Heliyon. 2023 Jun 9;9(6):e17185. doi: 10.1016/j.heliyon.2023.e17185. eCollection 2023 Jun.
Eccentric fiber Bragg grating (EFBG) is inscribed in standard communication single-mode fiber using femtosecond laser pulses, and the temperature and strain sensing characteristics are experimentally demonstrated and analyzed. The EFBG exhibits strong thermal stability and good robustness in high-temperature measurement up to 1000 °C, and undergoes different thermal sensitivities during Bragg peak and the strong resonance coupled cladding spectral comb. The temperature sensitivity linearly increases with respect to the effective index of the resonant modes. Such a situation also occurs in axial strain measurement. These characteristics are of high interest for multiparametric sensing at high temperatures.
采用飞秒激光脉冲在标准通信单模光纤中写入偏心光纤布拉格光栅（EFBG），并对其温度和应变传感特性进行了实验验证和分析。EFBG在高达1000°C的高温测量中表现出很强的热稳定性和良好的鲁棒性，并且在布拉格峰和强共振耦合包层光谱梳期间具有不同的热灵敏度。温度灵敏度相对于共振模式的有效折射率呈线性增加。这种情况在轴向应变测量中也会出现。这些特性对于高温下的多参数传感具有很高的研究价值。
