Title :
Microcapillary-Based High-Sensitivity and Wavelength-Tunable Optical Temperature Sensor
Author :
Yun Liu ; Zigeng Liu ; Shimeng Chen ; Ming Han ; Wei Peng
Author_Institution :
Coll. of Phys. & Optoelectron. Eng., Dalian Univ. of Technol., Dalian, China
Abstract :
A high-sensitivity and wavelength-tunable temperature sensor based on a short piece of fused-silica microcapillary (FSC) spliced between two single mode fibers (FSCs) and immerged in ethonal solution is proposed and experimentally investigated. Using the thermo-optic effect of ethanol and high sensitivity to refractive index of the FSC modal interference, the temperature sensitivity of the sensor immerged in ethanol solutions is significantly increased over an FSC sensor in air. Besides, the sensitivity and the feature wavelength of the interferometer can be tuned by adjusting the concentration and refractive index of the filling ethonal solution, which is important for achieving the maximum measurement range.
Keywords :
fibre optic sensors; light interference; light interferometry; micro-optics; microsensors; optical design techniques; optical fibre fabrication; optical fibre testing; optical tuning; organic compounds; refractive index; silicon compounds; temperature measurement; temperature sensors; thermo-optical effects; FSC modal interference; FSC sensor; SiO2; ethonal solution; fused-silica microcapillary-based high-sensitivity optical temperature sensor; fused-silica microcapillary-based wavelength-tunable optical temperature sensor; interferometer; refractive index; single mode fibers; thermo-optic effect; Ethanol; Interference; Liquids; Optical fiber sensors; Sensitivity; Temperature measurement; Temperature sensors; Interference; fiber optic sensor; micro capillary; refractive index;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2377195
