温度自补偿的级联式光纤表面等离子体共振折射率传感器  

Cascaded Fiber-Optic Surface Plasmon Resonance Refractive Index Sensor with Temperature Self-Compensation

作　　者：贾磊 葛益娴[1,2] 芮菲 王婷婷[2] 倪海彬[1,2] Jia Lei;Ge Yixian;Rui Fei;Wang Tingting;Ni Haibin(Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET),Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China;School of Electronics&Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]南京信息工程大学江苏省大气环境与装备技术协同创新中心,江苏南京210044 [2]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《光学学报》2023年第13期36-43,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61307061)。

摘　　要：提出并制备了一种温度自补偿的光纤表面等离子体共振(SPR)折射率传感器,用于实现温度和折射率(RI)的同时测量。该传感器利用细芯光纤(TCF)与多模光纤(MMF)构成MMF-TCF-MMF双通道级联结构,通道1涂覆银膜实现折射率传感,通道2涂覆复合膜(Ag-ITO)以及聚二甲基硅氧烷(PDMS)膜来实现温度传感,进而达到温度补偿的目的。当折射率和温度变化时,两个共振波长将发生变化,通过监测两个共振波谷的波长偏移可以同时测量折射率和温度。实验结果表明,两个通道在1.333~1.357 RIU(RIU为折射率单位)范围内的折射率灵敏度分别为3141.85 nm/RIU和0 nm/RIU,40~80℃范围内的温度灵敏度分别为-0.07 nm/℃和-1.74 nm/℃。该传感器具有体积小、灵敏度高、易制作等优点,在生物医学、环境监测等领域具有一定的应用价值。Objective Refractive index(RI)measurement plays an important role in many fields,especially in medical diagnosis,industrial manufacturing,and food safety.The fiber-optic surface plasmon resonance(SPR)sensor has attracted much attention from researchers owing to its advantages of small size,compact structure,high sensitivity,and strong antielectromagnetic interference.It is highly sensitive to changes in the external environment due to its high sensitivity.The cross-sensitivity of the fiber-optic SPR sensor to the RI and temperature limits the accuracy of the sensor.Therefore,research of a RI sensor with temperature compensation has certain practical significance.Some researchers used different grinding angles to produce different SPR phenomena and achieved temperature compensation by combining different grinding angles.Nevertheless,the sensors that they adopted were complicated to manufacture and could not be massproduced.Others have proposed temperature compensation through fiber Mach-Zehnder(M-Z)interference,fiber Fabry-Perot(F-P)interference,and the combination of fiber Bragg Gratings(FBGs)with the SPR effect.However,this kind of SPR sensor with temperature self-compensation often needs two demodulation systems,and the demodulation process is relatively complicated.This study proposes and implements a cascaded fiber-optic SPR RI sensor with temperature selfcompensation readily available for the simultaneous measurement of the RI and temperature to achieve the purpose of temperature compensation.Methods In the cascaded fiber-optic SPR RI sensor with temperature self-compensation,thin-core fiber is used to obtain a multimode fiber-thin-core fiber-multimode fiber(MMF-TCF-MMF)structure,and the cascade mode is adopted to achieve dual-channel sensing.When the light is transmitted from the MMF to the TCF,part of the light leaks to the TCF cladding due to fiber core mismatch.The evanescent wave generated immediately penetrates the metal film and reaches the interface between the metal and the medium to be measured,tri

关 键 词：光纤光学 光纤传感器 表面等离子体共振 细芯光纤 折射率 温度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]