基于SPR光谱分析的液体折射率测量研究  

Study on Measurement of Liquid Refractive Index by Analyzing SPR Spectrum Character

作　　者：曾捷[1] 梁大开[1] 曾振武[1] 杜燕[1] 

机构地区：[1]南京航空航天大学智能材料与结构航空科技重点实验室,江苏南京210016

出　　处：《光谱学与光谱分析》2006年第4期723-727,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(60477031;60535020);航空科学基金(04G52042);江苏省自然科学基金(BK2004128)资助项目

摘　　要：文章从电磁场理论和射线理论的角度,详细讨论了光纤表面等离子体波传感器工作原理,分析了表面等离子体共振(SPR)光谱共振波长与液体介质折射率之间的对应关系。采用相关光谱检测技术,获得八种不同类型分析醇所对应的SPR光谱曲线族,其共振波长随液体折射率的增大而逐渐向长波长方向偏移。通过对乙醇与乙二醇混合液体所对应的共振光谱分析,实现对两者配比浓度的测定。整个传感系统结构简单,测量光路部分实现全光纤化,不仅能够对目标测量介质的实时、快速、精确测量,还可用于特殊测量场合,实现远程遥测功能。The principle of optic fiber surface plasmon resonance sensor is discussed in detail based on the electromagnetic theory and radial theory in the present paper. The relationship between SPR spectrum resonance wavelength and liquid refractive index is also analyzed. Through relative spectrum measurement technology, SPR spectrum curves, whose resonance wavelength increases with increasing liquid refractive index, were obtained for eight different kinds of chemical liquids. The measurement of concentration of mixed solution including ethanol and glycol was performed by analyzing the spectrum attribute. The experimenrtal results show that the sensing system features simple structure and all light transmitted by fiber. It not only realizes rapid, accurate and real time measurement for target medium, but also can be used in some special situations and easily realize long distance measurement.

关 键 词：SPR光谱分析 表面等离子体波 光纤传感器 折射率 

分 类 号：TN253[电子电信—物理电子学]