期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 29, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6501/aac992
关键词
modal interferometer; fibre bend; polymer coating; temperature measurement
资金
- National Key R&D Program of China [2016YFE0126500]
- National Natural Science Foundation of China (NSFC) [61575050]
- Key Program for Natural Science Foundation of Heilongjiang Province of China [ZD2016012]
- Open Fund of the State Key Laboratory on Integrated Optoelectronics [IOSKL2016KF03]
- 111 project [B13015]
- Government of Ireland International Scholarship programme
- PhD Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities [HEUGIP201820]
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 degrees C-1 with a resolution of 0.008 degrees C over the temperature range of 20.7 degrees C-31.7 degrees 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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