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High sensitivity temperature sensor based on balloon-shaped bent SMF structure with its original polymer coating
Date
2018
Abstract
A high sensitivity optical fibre temperature sensor is demonstrated based on a balloon-shaped bent single-mode (BSBS) fibre structure where the fibre retains its original protective polymer coating. The BSBS fibre structure can be simply realized by bending a coated straight single-mode fibre into the balloon shape using a section of silica capillary tube. By adjusting the bending radius of the balloon-shaped fibre section, a modal interferometer between the core mode and the coating mode can be effectively implemented at a suitable bending radius. Considering the intrinsically high thermo-optical coefficient and thermal expansion coefficient of the polymer coating, the BSBS fibre structure offers excellent temperature sensing performance. Experimental results show that the temperature sensitivity is as high as −2465 pm °C−1 with a resolution of 0.008 °C over the temperature range of 20.7 °C–31.7 °C. Based on its simple fabrication process, very low cost, and experimentally determined high sensitivity coupled with good repeatability, the temperature sensor described in this article could be a competitive candidate in many temperature sensing applications.
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Description
peer-reviewed
Publisher
IOP Publishing
Citation
Measurement Science and Technology;29 (8)
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Lewis_2018_High.pdf
Adobe PDF, 1.15 MB
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Funding Information
National Key R&D Program of China, National Natural Science Foundation of China, Natural Science Foundation of Heilongjiang, State Key Laboratory on Integrated Optoelectronic, Government of Ireland Postgraduate Scholarship