Simultaneous measurement of refractive index, temperature and strain based on core diameter mismatch and polarization-maintaining FBG  

作　　者：童峥嵘 王洁玉 张卫华 曹晔 

机构地区：[1]Key Laboratory of Film Electronics and Communication Devices and Key Laboratory of Intelligent Computing and Novel Software Technology, School of Computer and Communication Engineering, Tianjin University of Technology

出　　处：《Optoelectronics Letters》2013年第3期238-240,共3页光电子快报（英文版）

基　　金：supported by the Tianjin Natural Science Foundation (No.11JCYBJC00100 and 13JCQNJC01800)

摘　　要：A kind of fiber-optic sensor for simultaneous measurement of refractive index of surrounding medium, temperature and strain is described. Based on core diameter mismatch, a multimode-single mode-multimode (MSM) structure is presented. It is demonstrated that the three parameters can be measured respectively by the interference of the core mode and cladding modes excited in the single mode fiber (SMF). Then combined with a polarization-maintaining fiber Bragg grating (PMFBG) which has different sensing properties from MSM structure, three parameters are measured simultaneously. The experimental results show that PMFBG is insensitive to the refractive index and the refractive index sensitivity of the MSM structure is 96.04 nm·RIU^(-1); the temperature sensitivities of the characteristic wavelength for MSM structure and the center wavelengths of fast and slow axes for PMFBG are 0.0911 nm °C^(-1), 0.00976 nm °C^(-1) and 0.0105 nm °C^(-1), respectively; the strain sensitivities of those are -0.013 nm με^(-1), 0.012 nm με^(-1) and 0.012 nm με^(-1), respectively.A kind of fiberoptic sensor for simultaneous measurement of refractive index of surrounding medium, temperature and strain is described. Based on core diameter mismatch, a multimodesingle modemultimode （MSM） structure is presented. It is demonstrated that the three parameters can be measured respectively by the interference of the core mode and cladding modes excited in the single mode fiber （SMF）. Then combined with a polarizationmaintaining fi ber Bragg grating （PMFBG） which has different sensing properties from MSM structure, three parameters are meas ured simultaneously. The experimental results show that PMFBG is insensitive to the refractive index and the refrac tive index sensitivity of the MSM structure is 96.04 nmRIUl; the temperature sensitivities of the characteristic wave length for MSM structure and the center wavelengths of fast and slow axes for PMFBG are 0.0911 nmCJ, 0.00976 nm. and 0.0105 nm. CL, respectively; the strain sensitivities of those are 0.013 nm pel, 0.012 nm. tel and 0.012 nm , respectively.

关 键 词：温度敏感性 应变灵敏度 同时测量 折射率 不匹配 光纤光栅 直径 MSM结构 

分 类 号：TN253[电子电信—物理电子学] O633.22[理学—高分子化学]