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论述了检测系统和基于拉锥技术的光纤表面等离子共振(SPR)传感器的详细设计。制定了基于SPR的光纤传感器检测水样品的盐度的比较方案,以满足一些实践需求,诸如精度,速度快,小尺寸和高灵敏度折射率单位(RIU)。利用Matlab和C++仿真得到了每个参数对光纤拉锥SPR传感器系统设计性能的影响,这为设备参数的合理选择提供了理论依据。设计了一种新的检测系统,将光学、机械和电子技术相结合。根据拉锥技术、模场分析理论及初步实验结果表明,该装置基本上达到了设计要求,如小巧、便携、良好的线性度和高度单位折射率。基于这个新设备对具有不同的盐度的NACL-水混合物进行了SPR实验,实验结果表明,可以实现对单个样品的精确检测。其谐振波长分辨率可以达到0.15 nm,同时,该检测结果具有较高的线性度和良好的稳定性,折射率(RI)检测偏差小于0.002。
The detailed design of detection system and optical fiber surface plasmon resonance (SPR) sensor based on tapering technology is discussed. A SPR-based optical fiber sensor was developed to compare the salinity of water samples to meet some practical needs such as accuracy, speed, small size and high sensitivity RIU. The influence of each parameter on the design performance of fiber optic taper cone SPR sensor system is obtained by Matlab and C ++ simulation, which provides a theoretical basis for the reasonable choice of equipment parameters. A new inspection system has been designed that combines optical, mechanical and electronic technologies. According to the tapering technology, mode field analysis theory and preliminary experimental results show that the device basically meets the design requirements, such as compact, portable, good linearity and high unit refractive index. Based on this new facility, SPR experiments were performed on NACL-water mixtures with different salinities. The experimental results show that accurate detection of individual samples can be achieved. The resonant wavelength resolution can reach 0.15 nm. At the same time, the detection results have high linearity and good stability, and the refractive index (RI) detection deviation is less than 0.002.