Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer

Zixuan Luo; Sheng Lin; Kuikui Guo; Rang Chu; Fei Zhou; Ye Liu

doi:10.1117/12.3005133

18 December 2023 Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer

Zixuan Luo, Sheng Lin, Kuikui Guo, Rang Chu, Fei Zhou, Ye Liu

Author Affiliations +

Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 129680T (2023) https://doi.org/10.1117/12.3005133
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

Fiber optic temperature sensors for small-scale heat sources have an urgent need in many industrial fields. We first propose and demonstrate an ultra-short fiber optic temperature sensor based on a Fabry-Perot (FP) interferometer which combines a fiber Bragg grating (FBG) with Fresnel reflection on the fiber end face. The FBG with a grating length of 50 μm was inscribed by a femtosecond laser line-by-line scanning technology. This FBG exhibits a resonant wavelength of 1548.8 nm and a broad full width at half maximum (FWHM) bandwidth of 12.4 nm. The selected dip wavelength of the FBG-FP cavity sensor changes linearly with the temperature increase, corresponding to the temperature sensitivity of 10.8 pm/°C. Moreover, the FBG-FP cavity sensor can be used to measure the temperature of the small-scale laser spot due to its compact structure. The experimental results show the temperature at different positions of laser exposure area are 138.4 °C, 111.5 °C and 74.4 °C, respectively.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zixuan Luo, Sheng Lin, Kuikui Guo, Rang Chu, Fei Zhou, and Ye Liu "Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 129680T (18 December 2023); https://doi.org/10.1117/12.3005133

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