Harris Jeremie, Lu Ping, Larocque Hugo, Xu Yanping, Chen Liang, Bao Xiaoyi
Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.
Opt Express. 2013 Apr 22;21(8):9996-10009. doi: 10.1364/OE.21.009996.
A novel fiber-optic refractometer is proposed and demonstrated to achieve temperature- and axial strain-compensated refractive index measurement using highly sensitive outer-cladding modes in a tapered bend-insensitive fiber based Mach-Zehnder interferometer. Peak wavelength shifts associated with different spatial frequency peaks are calibrated to obtain a wavelength-related character matrix (λ)M(RI,T,ε) for simultaneous measurement of multiple environmental variables. A phase-related character matrix (Φ)M(RI,T,ε) is also acquired by direct determination of refractive index, temperature, and axial strain induced phase shifts of the corresponding sensing modes.
提出并演示了一种新型光纤折射仪，该折射仪利用基于马赫-曾德尔干涉仪的锥形低弯曲敏感光纤中的高灵敏度外包层模式实现温度和轴向应变补偿的折射率测量。对与不同空间频率峰值相关的峰值波长偏移进行校准，以获得用于同时测量多个环境变量的波长相关特征矩阵(λ)M(RI,T,ε)。还通过直接确定相应传感模式的折射率、温度和轴向应变引起的相移来获取相位相关特征矩阵(Φ)M(RI,T,ε)。
