填充型增敏式光子晶体光纤压力传感器结构

为了实现光纤传感器压力增敏的效果，设计了一种具有高双折射的光子晶体光纤结构。采用有限元法计算光子晶体光纤在不同应力作用下的有效折射率, 基于光子晶体光纤的压敏特性，分析光子晶体光纤的模式, 并选择该结构里的一个空气孔，填充具有特定折射率的液体材料，构成新型压力传感器。该结构的压力灵敏度由COMSOL软件的仿真得出。结果表明, 经填充液体后，偏振相位灵敏度从72rad/(MPa·m)提升至128rad/(MPa·m)，显著提高了77.7%。该研究对增强传感器的力学性能有帮助。

Structure of sensitized photonic crystal fiber pressure sensor filled with liquid

In order to achieve the effect of pressure sensitization of optical fiber sensor, a photonic crystal fiber structure with high birefringence was designed. The effective refractive index of photonic crystal fiber was calculated by the finite element method when it was applied different stress. Based on the pressure-sensitive characteristics of photonic crystal fiber, the mode of photonic crystal fiber was analyzed. An air hole in the structure was selected and filled with the liquid of specific refractive index. A new pressure sensor was formed by above structures. The pressure sensitivity of the structure was simulated by COMSOL. The simulation results show that the polarization phase sensitivity of photonic crystal fiber sensor increases from 72rad/(MPa·m) to 128rad/(MPa·m). The sensitivity is improved by 77.7% significantly, which contributes to enhance the properties of the sensor.