SNS optical fiber sensor for direct detection of phase transitions in C18H38 n-alkane material

Han, Wei, Rebow, Marek, Lian, Xiaokang, Liu, Dejun, Farrell, Gerald, Wu, Qiang, Ma, Youqiao and Semenova, Yuliya (2019) SNS optical fiber sensor for direct detection of phase transitions in C18H38 n-alkane material. Experimental Thermal and Fluid Science, 109. p. 109854. ISSN 0894-1777

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Official URL: https://doi.org/10.1016/j.expthermflusci.2019.1098...

Abstract

A single-mode-no-core-single-mode (SNS) fiber optical sensor for the detection of solid-liquid and liquid-solid phase changes in C18H38 n-alkane (n-octadecane) is proposed and demonstrated. The transmission-type sensor probe consists of a short section of no-core fiber sandwiched between two sections of a single-mode fiber. Phase changes in n-octadecane are accompanied by large step-like variations of its refractive index (RI). Such a large discontinuous change of the n-octadecane’s RI during its phase transition leads to the corresponding step-like change in the transmitted optical power that can reliably indicate the phase change of the sample in the vicinity of the sensor. The proposed sensor probe is simple, accurate and is capable of detecting the material’s phase based on a single measurement. The results of this work suggest that the proposed sensor is potentially capable of detecting liquid-solid phase changes in other materials whose thermo-optic properties are similar to those of n-octadecane.

Item Type: Article
Uncontrolled Keywords: Optical fiber sensor, Phase change materials (PCMs), n-octadecane
Subjects: F300 Physics
H300 Mechanical Engineering
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 19 Jun 2019 10:31
Last Modified: 11 Oct 2019 09:34
URI: http://nrl.northumbria.ac.uk/id/eprint/39729

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