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Sensors 2018, 18(1), 202; https://doi.org/10.3390/s18010202

High-Temperature Sensor Based on Fabry-Perot Interferometer in Microfiber Tip

1
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
2
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
3
Department of Electronic Engineering, College of Information Science and Techonology, Jinan University, Guangzhou 510632, China
4
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
5
Institute of Optoelectronic Material and Technology, South China Normal University, Guangzhou 510631, China
6
State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
*
Author to whom correspondence should be addressed.
Received: 13 December 2017 / Revised: 6 January 2018 / Accepted: 8 January 2018 / Published: 12 January 2018
(This article belongs to the Special Issue Optical Fiber Sensors 2017)
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Abstract

A miniaturized tip Fabry-Perot interferometer (tip-FPI) is proposed for high-temperature sensing. It is simply fabricated for the first time by splicing a short length of microfiber (MF) to the cleaved end of a standard single mode fiber (SMF) with precise control of the relative cross section position. Such a MF acts as a Fabry-Perot (FP) cavity and serves as a tip sensor. A change in temperature modifies the length and refractive index of the FP cavity, and then a corresponding change in the reflected interference spectrum can be observed. High temperatures of up to 1000 °C are measured in the experiments, and a high sensitivity of 13.6 pm/°C is achieved. This compact sensor, with tip diameter and length both of tens of microns, is suitable for localized detection, especially in harsh environments. View Full-Text
Keywords: optical fiber sensor; temperature; FPI optical fiber sensor; temperature; FPI
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Chen, Z.; Xiong, S.; Gao, S.; Zhang, H.; Wan, L.; Huang, X.; Huang, B.; Feng, Y.; Liu, W.; Li, Z. High-Temperature Sensor Based on Fabry-Perot Interferometer in Microfiber Tip. Sensors 2018, 18, 202.

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