Abstract

In this paper, up to 1100°C and 1200°C high-temperature distributed Brillouin sensing based on a ${\mathrm{GeO}}_2$-doped single-mode fiber (SMF) and a pure silica photonic crystal fiber (PCF) are demonstrated, respectively. The Brillouin frequency shift’s (BFS) dependence on temperatures of the SMF and PCF agrees with a nonlinear function instead of a linear function, which is mainly due to the change of the acoustic velocity in a silica fiber. BFS hopping is observed in both kinds of fibers between 800°C–900°C in the first annealing process, and after that, the BFS exhibits stability and repeatability with a measurement accuracy as high as $\pm 2.4°\mathrm{C}$ for the SMF and $\pm 3.6°\mathrm{C}$ for the PCF. The BFS hopping is a highly temperature-dependent behavior, which means that a high temperature ($>800°\mathrm{C}$) would accelerate this process to reach a stable state. After BFS hopping, both the SMF and PCF show good repeatability for temperatures higher than 1000°C without annealing. The process of coating burning of a silica fiber not only introduces a loss induced by micro-bending, but also imposes a compressive stress on the bare fiber, which contributes to an additional BFS variation at the temperature period of the coating burning ($\sim 300°\mathrm{C}–500°\mathrm{C}$).

© 2016 Optical Society of America

Distributed Brillouin optical fiber temperature and strain sensing at a high temperature up to 1000 °C by using an annealed gold-coated fiber

Pengbai Xu, Dexin Ba, Weiming He, Hongping Hu, and Yongkang Dong
Opt. Express 26(23) 29724-29734 (2018)

Investigation of the effect of gold coating of gold-coated fiber on distributed strain measurement by differential pulse pair Brillouin optical-time analysis

Pengbai Xu, Ou Xu, Xinyong Dong, Jun Yang, and Yuwen Qin
Appl. Opt. 58(31) 8376-8382 (2019)

Bend-insensitive distributed sensing in singlemode-multimode-singlemode optical fiber structure by using Brillouin optical time-domain analysis

Pengbai Xu, Yongkang Dong, Juwang Zhang, Dengwang Zhou, Taofei Jiang, Jinlong Xu, Hongying Zhang, Tao Zhu, Zhiwei Lu, Liang Chen, and Xiaoyi Bao
Opt. Express 23(17) 22714-22722 (2015)

Multi-parameter distributed fiber optic sensing using double-Brillouin peak fiber in Brillouin optical time domain analysis

Nageswara Lalam, Hari Bhatta, Xiaoguang Sun, Ping Lu, Paul Ohodnicki, Michael P. Buric, and Ruishu Wright
Opt. Express 31(22) 36590-36602 (2023)

Simultaneous measurement of pressure and temperature using dual-path distributed Brillouin sensor

Haidong Gu, Huijuan Dong, Guangyu Zhang, Wenhua Hu, and Zhongjian Li
Appl. Opt. 54(11) 3231-3235 (2015)