Simultaneous measurement of refractive index, temperature and strain based on core diameter mismatch and polarization-maintaining FBG
作者： Zheng-rong Tong , Jie-yu Wang , Wei-hua Zhang , Ye Cao
DOI: 10.1007/S11801-013-2403-1
关键词:
摘要: A kind of fiber-optic sensor for simultaneous measurement refractive index surrounding medium, temperature and strain is described. Based on core diameter mismatch, a multimode-single mode-multimode (MSM) structure presented. It demonstrated that the three parameters can be measured respectively by interference mode cladding modes excited in single fiber (SMF). Then combined with polarization-maintaining Bragg grating (PMFBG) which has different sensing properties from MSM structure, are simultaneously. The experimental results show PMFBG insensitive to sensitivity 96.04 nm·RIU−1; sensitivities characteristic wavelength center wavelengths fast slow axes 0.0911 nm · °C−1, 0.00976 °C−1 0.0105 respectively; those −0.013 μɛ−1, 0.012 μɛ−1 respectively.
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