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http://dx.doi.org/10.5369/JSST.2016.25.5.344

Silicon Oil-Based 2-Channel Fiber-Optic Temperature Sensor Using a Subtraction Method  

Lee, Dong Eun (School of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, Konkuk University)
Yoo, Wook Jae (School of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, Konkuk University)
Shin, Sang Hun (School of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, Konkuk University)
Kim, Mingeon (School of Energy Systems Engineering, Chung-Ang University)
Song, Young Beom (School of Energy Systems Engineering, Chung-Ang University)
Kim, Hye Jin (School of Energy Systems Engineering, Chung-Ang University)
Jang, Kyoung Won (School of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, Konkuk University)
Tack, Gye Rae (School of Biomedical Engineering, BK21 Plus Research Institute of Biomedical Engineering, Konkuk University)
Lee, Bongsoo (School of Energy Systems Engineering, Chung-Ang University)
Publication Information
Journal of Sensor Science and Technology / v.25, no.5, 2016 , pp. 344-348 More about this Journal
Abstract
We developed a 2-channel fiber-optic temperature sensor (FOTS) using a temperature sensing probe, a fiber-optic coupler, transmitting optical fiber, and an optical time domain reflectometer (OTDR). The temperature sensing probe is divided into a sensing probe and a reference probe for accurate thermometry. A sensing probe is composed of a silicon oil, a FC terminator, a brass pipe, and a singlemode optical fiber and the structure of a reference probe is identical with that of the sensing probe excluding a silicon oil. In this study, we measured the modified optical powers of the light signals reflected from the temperature sensing probe placed inside of the water with a thermal variation from 5 to $70^{\circ}C$. Although the optical power of the reference probe was constant regardless of the temperature change, the optical power of the sensing probe decreased linearly as the temperature increased. As experimental results, the FOTS using a subtraction method showed a small difference (i.e., hysteresis) in its response due to heating and cooling. The reversibility and reproducibility of the FOTS were also evaluated.
Keywords
Fiber-optic temperature sensor; Silicone oil; Fresnel reflection; OTDR; Subtraction method;
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Times Cited By KSCI : 8  (Citation Analysis)
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