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Sensors 2019, 19(8), 1819; https://doi.org/10.3390/s19081819

A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference

1
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
2
State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Received: 27 March 2019 / Revised: 14 April 2019 / Accepted: 15 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue Fiber Optic Sensors and Applications)
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Abstract

In this paper, a miniature Fabry-Perot temperature probe was designed by using polydimethylsiloxane (PDMS) to encapsulate a microfiber in one cut of hollow core fiber (HCF). The microfiber tip and a common single mode fiber (SMF) end were used as the two reflectors of the Fabry-Perot interferometer. The temperature sensing performance was experimentally demonstrated with a sensitivity of 11.86 nm/°C and an excellent linear fitting in the range of 43–50 °C. This high sensitivity depends on the large thermal-expansion coefficient of PDMS. This temperature sensor can operate no higher than 200 °C limiting by the physicochemical properties of PDMS. The low cost, fast fabrication process, compact structure and outstanding resolution of less than 10−4 °C enable it being as a promising candidate for exploring the temperature monitor or controller with ultra-high sensitivity and precision. View Full-Text
Keywords: fiber sensors; temperature sensors; Fabry-Perot interferometer; microfiber; PDMS; integrated optics fiber sensors; temperature sensors; Fabry-Perot interferometer; microfiber; PDMS; integrated optics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, Z.; Zhang, Y.; Ren, C.; Sui, Z.; Li, J. A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference. Sensors 2019, 19, 1819.

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