Institute of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Sensors (Basel). 2018 Jun 27;18(7):2051. doi: 10.3390/s18072051.
The characteristics of the dual-core photonic crystal fiber (PCF) sensor are studied using the finite element method (FEM), and the structure is improved according to the numerical simulation results. The results show that whether or not the four large air holes far away from the geometry center of the PCF are filled with analyte has no influence on the wavelength sensitivity of the sensor which means those holes can be replaced by small air holes. The wavelength sensitivity can be tuned by adjusting the sizes of the other large air holes which are as for liquid holes. The dynamic detection range of the refractive index (RI) is from 1.33 to 1.51. In particular, high linearity is obtained in the range of 1.44 to 1.51. The sensitivity is as high as 6021 nm/RIU when the liquid holes are the smallest. When liquid holes are tangential with the envelope of first layer air holes, the wavelength sensitivity is 4028 nm/RIU, and the coefficient of determination (R²) is 0.99822 when the RI of the analyte varies from 1.44 to 1.51 which shows that high sensitivity and good linearity are both obtained.
采用有限元法（FEM）研究了双芯光子晶体光纤（PCF）传感器的特性，并根据数值模拟结果对结构进行了改进。结果表明，无论 PCF 几何中心远处的四个大空气孔是否填充有分析物，对传感器的波长灵敏度都没有影响，这意味着这些孔可以用小孔代替。通过调整其他大空气孔的尺寸可以调节波长灵敏度，这些大空气孔与液体孔相对应。折射率（RI）的动态检测范围为 1.33 至 1.51。特别是在 1.44 至 1.51 的范围内获得了很高的线性度。当液体孔最小时，灵敏度高达 6021nm/RIU。当液体孔与第一层空气孔的包络相切时，当分析物的 RI 从 1.44 变化到 1.51 时，波长灵敏度为 4028nm/RIU，决定系数（R²）为 0.99822，这表明同时获得了高灵敏度和良好的线性度。
