Open AccessChalcogenide fiber-based distributed temperature sensor with sub-centimeter spatial resolution and enhanced accuracy
Author(s) -
Trung D. Vo,
Jiale He,
Eric Mägi,
Matthew J. Collins,
Alex S. Clark,
Brian G. Ferguson,
Chunle Xiong,
Benjamin J. Eggleton
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.001560
Subject(s) - chalcogenide , optics , materials science , raman scattering , image resolution , refractive index , temperature measurement , raman spectroscopy , raman amplification , fiber optic sensor , photon counting , fiber , optical fiber , resolution (logic) , optoelectronics , photon , physics , computer science , quantum mechanics , artificial intelligence , composite material
We demonstrate a sub-centimeter spatial resolution fiber-based distributed temperature sensor with enhanced measurement accuracy and reduced acquisition time. Our approach employs time domain analysis of backscattered Stokes and anti-Stokes photons generated via spontaneous Raman scattering in a chalcogenide (ChG) As2S3 fiber for temperature monitoring. The sensor performance is significantly improved by exploiting the high Raman coefficient and increased refractive index of the ChG fiber. We achieve a temperature uncertainty of ± 0.65 °C for a short measurement time of only 5 seconds; whilst the detection uncertainty is less than ± 0.2 °C for a longer integration time of 2 minutes. We also investigate the optimum Stokes and anti-Stokes bands for optimal sensing performance. Our theoretical analysis shows that a small detuning frequency regime from a pump is more suitable for rapid measurements while a large detuning regime provides higher temperature resolution.