Yang Jing, Guan Chunying, Zhang Jiaming, Wang Mingjie, Yang Min, Zhu Zheng, Wang Pengfei, Yang Jun, Yuan Libo
Appl Opt. 2019 Aug 20;58(24):6597-6603. doi: 10.1364/AO.58.006597.
A low-temperature crosstalk and surrounding refractive index insensitive vector bending sensor based on resonance coupling is proposed and experimentally demonstrated. The sensor is constructed by directly sandwich-splicing a segment of single eccentric hole-assisted dual-core fiber between two single-mode fibers. The transmission characteristics of the sensor are theoretically analyzed by combining coupled-mode theory and full-vector finite-element method. The bending responses of the sensor are experimentally measured in the curvature range of 0-3.6651 m. The bending sensitivities are -15.95 nm/m and 14.87 nm/m at 0° and 180° bending orientation, respectively, which are higher than that of most long-period fiber-grating-based and interferometer-based vector bending sensors. Moreover, the temperature and surrounding refractive index responses of the sensor are investigated. The measured results show that the proposed sensor has a low temperature sensitivity of 21.7 pm/°C in the range of 15°C-55°C and is insensitive to the surrounding refractive index in the range of 1.335-1.425, which reduces the cross-sensitivity from temperature and surrounding refractive index.
提出并通过实验验证了一种基于共振耦合的低温串扰和周围折射率不敏感的矢量弯曲传感器。该传感器通过将一段单偏心孔辅助双芯光纤直接夹在两根单模光纤之间构建而成。结合耦合模理论和全矢量有限元方法对传感器的传输特性进行了理论分析。在0 - 3.6651 m的曲率范围内对传感器的弯曲响应进行了实验测量。在0°和180°弯曲方向上，弯曲灵敏度分别为-15.95 nm/m和14.87 nm/m，高于大多数基于长周期光纤光栅和干涉仪的矢量弯曲传感器。此外，还研究了传感器的温度和周围折射率响应。测量结果表明，所提出的传感器在15°C - 55°C范围内具有21.7 pm/°C的低温灵敏度，并且在1.335 - 1.425范围内对周围折射率不敏感，这降低了来自温度和周围折射率的交叉灵敏度。
