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1.重庆三峡学院 智能信息处理与控制重庆市高校市级重点实验室,重庆 404100
2.重庆三峡学院 物联网与智能控制技术重庆市工程研究中心,重庆 404100
[ "苏于东(1994-),男,重庆人,硕士研究生,2017年于重庆三峡学院获得学士学位,主要从事光纤SPR传感方面的研究。E-mail:suyudong9320@163.com" ]
[ "魏勇(1987-),男,内蒙古包头人,博士,副教授,硕士生导师,2013年、2016年于哈尔滨工程大学分别获得硕士、博士学位,主要从事光纤SPR传感技术、光纤光镊技术等方面的研究。E-mail:suyudong9320@163.com" ]
收稿日期:2019-09-29,
录用日期:2019-10-16,
纸质出版日期:2019-12-25
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苏于东, 魏勇, 吴萍, 等. 阶跃折射率多模光纤包层等离子体共振传感器[J]. 光学精密工程, 2019,27(12):2525-2533.
Yu-dong SU, Yong WEI, Ping WU, et al. Step-index multimode fiber cladding surface plasma resonance sensor[J]. Optics and precision engineering, 2019, 27(12): 2525-2533.
苏于东, 魏勇, 吴萍, 等. 阶跃折射率多模光纤包层等离子体共振传感器[J]. 光学精密工程, 2019,27(12):2525-2533. DOI: 10.3788/OPE.20192712.2525.
Yu-dong SU, Yong WEI, Ping WU, et al. Step-index multimode fiber cladding surface plasma resonance sensor[J]. Optics and precision engineering, 2019, 27(12): 2525-2533. DOI: 10.3788/OPE.20192712.2525.
光纤表面等离子体共振(SPR)传感器通常以纤芯为共振基底,需要采用腐蚀、侧抛、研磨等复杂的加工工艺将光纤包层去除,存在倏逝波不易泄露,传感探针制作困难的问题。本文提出一种以光纤包层为SPR共振基底的阶跃折射率多模光纤包层SPR传感器。采用单模光纤与阶跃折射率多模光纤偏芯熔接结构,将单模光纤纤芯中的光直接注入多模光纤包层,并在阶跃折射率多模光纤包层外镀50 nm金膜。在探针传感段,光场能量全部分布在阶跃折射率多模光纤包层中,发生SPR效应充分。与传统光纤包层SPR传感结构相比,该传感器能够获得更深的共振谷,折射率测量范围为1.333~1.385 RIU时,传感器的平均灵敏度可达2 307 nm/RIU,本文亦对传感段多模光纤纤芯直径与长度不同参数的影响进行了探究。本文提出的阶跃折射率多模光纤包层SPR传感器制作简单,有效解决了光纤包层与空气界面不易获得倏逝波的问题。
The optical fiber Surface Plasma Resonance (SPR) sensor is usually based on the fiber core as the resonance substrate. It is necessary to remove the optical fiber cladding by adopting complex processing technologies such as etching
side polishing
grinding
etc. However
there are problems such as evanescent waves that are not easy to leak or sensor probe making them difficult to observe. In this study
a step-index multimode fiber clad SPR sensor with fiber cladding as the SPR resonant substrate is proposed. The transmitted light of a single-mode fiber is injected into step-index multimode fiber cladding by core-shift welding and the 50 nm gold film is plated on the step-index multimode fiber cladding. In the probe sensing section
all the light field energy is distributed in the step-index multimode fiber cladding
the SPR effect is sufficient
and a deeper resonance valley is obtained than by using the conventional fiber cladding SPR sensing structure. When the refractive index measurement range is 1.333—1.385 RIU
the average sensitivity of the sensor can reach 2 307 nm/RIU. This study also explores the influence of different parameters on the diameter and length of the multimode fiber core in the sensing section. The step-index multimode fiber cladding SPR sensor proposed in this study is simple to fabricate and can effectively solve the evanescent wave problem making information difficult to obtain between fiber cladding and air interface.
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