Abstract

We present a self-filtering and high-resolution sapphire fiber sensor based on an extrinsic Fabry–Pérot interferometer for high-temperature sensing. The sensor has a high fringe visibility and signal-to-noise ratio. Two well-polished sapphire fibers are aligned side by side to realize shunting transmission between the background light and the interference signal. Heterogeneous fiber splicing between the sapphire fiber and the multimode silica fiber is realized for long-distance transmission of signals. A C-plane double-sided polished sapphire wafer is mounted perpendicularly to the tip of sapphire fibers as the Fabry–Pérot cavity. The crosstalk noise from input light caused by heterogeneous fiber splicing and fiber tip reflection is filtered out to reach a higher signal quality. A series of comparison experiments from 100 to 1080 °C were carried out for the difference in characteristics between self-filtering sensors and traditional sapphire fiber Fabry–Pérot sensors. The self-filtering sensor's fringe visibility was above 43.96%, and its signal-to-noise ratio was above 20.14 dB. The temperature resolution of the self-filtering sensor was better than 0.25 °C.

© 2019 IEEE

Sapphire optical fiber high-temperature vibration sensor

Yang Cui, Yi Jiang, Yutong Zhang, Xinxing Feng, Jie Hu, and Lan Jiang
Opt. Express 30(2) 1056-1065 (2022)

Sourceless optical fiber high temperature sensor

Zhipeng Tian, Zhihao Yu, Bo Liu, and Anbo Wang
Opt. Lett. 41(2) 195-198 (2016)

Sapphire-fiber-based white-light interferometric sensor for high-temperature measurements

Yizheng Zhu, Zhengyu Huang, Fabin Shen, and Anbo Wang
Opt. Lett. 30(7) 711-713 (2005)

All-sapphire-based fiber-optic pressure sensor for high-temperature applications based on wet etching

Zhiqiang Shao, Yalin Wu, Shuang Wang, Chaozhu Zhang, Zhiqiang Sun, Meiyu Yan, Yingqi Shang, Erdong Song, and Zhiyuan Liu
Opt. Express 29(3) 4139-4146 (2021)

Multiplexed high temperature sensing with sapphire fiber air gap-based extrinsic Fabry–Perot interferometers

Jiajun Wang, Bo Dong, Evan Lally, Jianmin Gong, Ming Han, and Anbo Wang
Opt. Lett. 35(5) 619-621 (2010)