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Sensors 2018, 18(2), 359; https://doi.org/10.3390/s18020359

A IR-Femtosecond Laser Hybrid Sensor to Measure the Thermal Expansion and Thermo-Optical Coefficient of Silica-Based FBG at High Temperatures

1
State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Yangtze Optical Fibre and Cable Joint Stock Limited Company, Wuhan 430073, China
2
National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
*
Authors to whom correspondence should be addressed.
Received: 21 November 2017 / Revised: 17 January 2018 / Accepted: 17 January 2018 / Published: 26 January 2018
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, a hybrid sensor was fabricated using a IR-femtosecond laser to measure the thermal expansion and thermo-optical coefficient of silica-based fiber Bragg gratings (FBGs). The hybrid sensor was composed of an inline fiber Fabry-Perot interferometer (FFPI) cavity and a type-II FBG. Experiment results showed that the type-II FBG had three high reflectivity resonances in the wavelength ranging from 1100 to 1600 nm, showing the peaks in 1.1, 1.3 and 1.5 μm, respectively. The thermal expansion and thermo-optical coefficient (1.3 μm, 1.5 μm) of silica-based FBG, under temperatures ranging from 30 to 1100 °C, had been simultaneously calculated by measuring the wavelength of the type-II FBG and FFPI cavity length. View Full-Text
Keywords: fiber optics sensor; IR-femtosecond laser; high temperatures; thermal expansion coefficient; thermo-optical coefficient fiber optics sensor; IR-femtosecond laser; high temperatures; thermal expansion coefficient; thermo-optical coefficient
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Li, L.; Lv, D.; Yang, M.; Xiong, L.; Luo, J. A IR-Femtosecond Laser Hybrid Sensor to Measure the Thermal Expansion and Thermo-Optical Coefficient of Silica-Based FBG at High Temperatures. Sensors 2018, 18, 359.

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