基于多模-细芯-多模光纤结构的双参数测量传感器

Dual-Parameter Measurement Sensor Based on Multi-Mode-Thin-Core-Multi-Mode Fiber Structure

设计并制作了一种基于多模-细芯-多模光纤(MMF-TCF-MMF)结构的双参数测量传感器,在此结构中同时产生马赫-曾德尔干涉(MZI)与表面等离子体共振(SPR),来实现对折射率和温度的同时测量。该传感器中的两段多模光纤(MMF)作为输入输出耦合器,细芯光纤(TCF)镀上一层金属银膜作为传感臂。实验结果表明,MZI和SPR在1.333~1.412 RIU范围内折射率灵敏度分别为-70.373 nm/RIU和4888.77 nm/RIU,在20~80℃范围内温度灵敏度分别为73.48 pm/℃和-0.3215 nm/℃。采用灵敏度矩阵实现了双参数测量,可解决折射率传感器温度的交叉敏感。该传感器成本低、灵敏度高、制作简单,在生物化学医疗检测领域有良好的应用前景。

This study designs and fabricates a dual-parameter measurement sensor based on a multi-mode thin-core multimode fiber structure.Mach-Zehnder interference(MZI) and surface plasmon resonance(SPR) are simultaneously generated in this structure to measure the refractive index and temperature.Two multi-mode fibers(MMFs) are used as the input and output couplers,and the thin-core fiber(TCF) is coated with a metallic silver film as the sensing arm.The refractive index sensitivity of MZI and SPR is-70.373 nm/RIU and 4888.77 nm/RIU in the range of 1.333-1.412 RIU,and the temperature sensitivity is 73.48 pm/℃ and-0.3215 nm/℃ in the range of 20-80 ℃,respectively.The sensitivity matrix is used to realize the two-parameter measurement,resolving the cross-sensitivity of the temperature of the refractive index sensor.The sensor is characterized by low cost,high sensitivity,and simple fabrication.Moreover,it has good application prospects in biochemical medical detection.