Abstract

A refractive index (RI) and liquid surface tension (ST) (at the level of ${10}^{-3}\mathrm{N}$) measurement system has been proposed by using a 1.80-cm-long, 8°-tilted fiber Bragg grating (TFBG). When the TFBG is pulled up from the liquid into the air at a fixed height (corresponding to a fixed contact angle between the fiber and the liquid), the ST acting upon the TFBG depends on the length of the TFBG covered with the liquid film along the fiber axis direction. The liquid film covering the grating results in the shifts of the resonant cladding modes of the TFBG. For the liquid with an RI in the range from 1.3341 to 1.4415, its RI and ST can be obtained through the measurements of shifts in the resonant wavelengths of the cutoff mode and changes in the intensities of the resonant wavelength dips in the TFBG spectrum by using the known ST and RI of water as a reference.

© 2018 Optical Society of America

Measurements of milli-Newton surface tension forces with tilted fiber Bragg gratings

Changyu Shen, Chuan Zhong, Dejun Liu, Xiaokang Lian, Jianyao Zheng, Jingjing Wang, Yuliya Semenova, Gerald Farrell, Jacques Albert, and John F. Donegan
Opt. Lett. 43(2) 255-258 (2018)

Twist sensor based on surface plasmon resonance excitation using two spectral combs in one tilted fiber Bragg grating

Xuejun Zhang, Jie Chen, Álvaro González-Vila, Fu Liu, Yuke Liu, Kaiwei Li, and Tuan Guo
J. Opt. Soc. Am. B 36(5) 1176-1182 (2019)

Refractive index sensor based on tilted fiber Bragg grating and stimulated Brillouin scattering

Xueliang Shi, Shilie Zheng, Hao Chi, Xiaofeng Jin, and Xianmin Zhang
Opt. Express 20(10) 10853-10858 (2012)

Decoupling bulk and surface characteristics with a bare tilted fiber Bragg grating

Zhihong Li, Fei Wang, Yanan Wang, Xinxin Jin, Yanmin Duan, and Haiyong Zhu
Opt. Express 31(12) 20150-20159 (2023)

Reflective liquid level sensor based on modes conversion in thin-core fiber incorporating tilted fiber Bragg grating

Bobo Gu, Wenliang Qi, Yanyan Zhou, Zhifang Wu, Perry Ping Shum, and Feng Luan
Opt. Express 22(10) 11834-11839 (2014)