Abstract

An intensity-modulated refractive index (RI) sensor based on a bending single-mode fiber (BSF) cascaded with fiber Bragg gratings (FBGs) is designed and experimentally investigated. The BSF structure can be easily fabricated by bending a section of single-mode fiber without coating, which is immersed in the RI matching solution. The different values of RI can be measured by monitoring the variation of the intensity difference of transmission dips of two FBGs. The experimental results show that the RI sensitivity of the proposed sensor is 413.23 dB/RIU in the sensing range from 1.333 to 1.371. In addition, the designed sensing system also shows a certain resistance to temperature cross-sensitivity and the fluctuation of light source, which can make a significant directive role in the field of food safety, biochemistry and environmental science.

Highly sensitive temperature and refractive index sensor based on no-core fiber cascaded with a balloon-shaped bent single-mode fiber

Xiaojun Zhu, Mengqiang Song, Xing Liu, Wen Liu, Yongquan Pan, Juan Cao, Guoan Zhang, Yongjie Yang, Yuechun Shi, and Wuming Wu
Appl. Opt. 62(35) 9266-9273 (2023)

Sensor based on macrobent fiber Bragg grating structure for simultaneous measurement of refractive index and temperature

Tiegen Liu, Yaofei Chen, Qun Han, Fangchao Liu, and Yunzhi Yao
Appl. Opt. 55(4) 791-795 (2016)

Simultaneous refractive index and temperature measurement using nested fiber balloon rings

Junfa Zhao, Panpan Niu, Cheng Zhang, Hua Bai, Xiaodong Sun, and Zhibo Han
Appl. Opt. 57(23) 6835-6839 (2018)

High-sensitivity refractive index and temperature sensor based on cascaded dual-wavelength fiber laser and SNHNS interferometer

Bin Yin, Songhua Wu, Muguang Wang, Wenqi Liu, Haisu Li, Beilei Wu, and Qichao Wang
Opt. Express 27(1) 252-264 (2019)

All-silica fiber-optic temperature-depth-salinity sensor based on cascaded EFPIs and FBG for deep sea exploration

Yueying Liu, Zhenguo Jing, Qiang Liu, Ang Li, Ang Lee, Yang Cheung, Yang Zhang, and Wei Peng
Opt. Express 29(15) 23953-23966 (2021)