Optoelectronics Letters, Volume. 9, Issue 3, 238(2013)

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

Zheng-rong TONG, Jie-yu WANG*, Wei-hua ZHANG, and Ye CAO
Author Affiliations
  • 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, Tianjin 300384, China
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    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.

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    TONG Zheng-rong, WANG Jie-yu, ZHANG Wei-hua, CAO Ye. Simultaneous measurement of refractive index, temperature and strain based on core diameter mismatch and polarization-maintaining FBG[J]. Optoelectronics Letters, 2013, 9(3): 238

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    Paper Information

    Received: Nov. 17, 2012

    Accepted: --

    Published Online: Oct. 12, 2017

    The Author Email: Jie-yu WANG (wangjieyu1111@sina.com)

    DOI:10.1007/s11801-013-2403-1

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