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Multi-channel fiber-optic temperature sensor system using an optical time-domain reflectometer

Authors
Kim, H.J.Byun, H.Song, Y.B.Shin, S.H.Cho, S.Pyeon, C.H.Lee, B.
Issue Date
Dec-2018
Publisher
Elsevier B.V.
Keywords
Fiber-optic temperature sensor; Optical time-domain reflectometer; Fresnel reflection; Multi-channel
Citation
Results in Physics, v.11, pp 743 - 748
Pages
6
Journal Title
Results in Physics
Volume
11
Start Page
743
End Page
748
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/3212
DOI
10.1016/j.rinp.2018.10.024
ISSN
2211-3797
2211-3797
Abstract
In this study, we developed a multi-channel fiber-optic temperature sensor system (FTSS) using an optical time-domain reflectometer (OTDR). The developed FTSS consists of fiber-optic temperature-sensing probes, a fiber-optic coupler, a transmitting optical fiber, and an OTDR. The fiber-optic temperature-sensing probes comprise silicon oil, a nickel-plated brass cap, a fiber channel (FC) terminator, and a single-mode optical fiber. The developed FTSS has four channels, which have fiber-optic temperature-sensing probes, connected using single-mode optical fibers of different lengths. Silicon oil is employed as a temperature-sensing material, as its refractive index changes with the temperature variations. We measured the optical powers of the reflected light signals (Fresnel reflection), which are generated at the interface between the silicon oil and core of the single-mode optical fiber in the distal ends of the sensing probes. The optical powers of the four channels of the FTSS were measured to simultaneously determine individual temperatures at four different points using an OTDR. © 2018 The Authors
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