Abstract

A novel distributed strain sensor method, to the best of our knowledge, based on a linearly chirped fiber Bragg grating (LCFBG), which can simultaneously determine the strain value and ascertain the position, is proposed and experimentally demonstrated. Different from the traditional distributed grating interrogation system via analyzing the optical spectrum of an LCFBG, the system is mainly based on the frequency domain measurement by using an optoelectronic oscillator (OEO) structure, which has the characteristics of fast response and high resolution. Based on this structure, when the distributed strain is applied to the LCFBG, the frequency response of the OEO for a reflective point of a certain wavelength will change. The strain value can be obtained by detecting the frequency shift of the OEO. Combined with the one-to-one correspondence between the wavelength and the spatial position of the LCFBG, the exact position of the strain point can be determined. In a proof-of-concept experiment, interrogation of fully distributed grating sensors with nonuniform strain distributions is demonstrated experimentally. A spatial resolution of ${\sim}{{3}}\;{{\unicode{x00B5}{\rm m}}}$ over a gauge length of 53 mm and a strain resolution of ${\lt}{{1}}\;\unicode{x00B5}\varepsilon$ have been achieved.

© 2023 Optica Publishing Group

High-precision temperature-compensated fiber Bragg grating axial strain sensing system based on a dual-loop optoelectronic oscillator with the enhanced Vernier effect

Lingge Gao, Yiping Wang, Xiaozhong Tian, Yunhao Xiao, Qiang Liu, and Dan Zhu
Appl. Opt. 62(19) 5317-5324 (2023)

Fiber Bragg grating sensor interrogation system based on an optoelectronic oscillator loop

Zuowei Xu, Xuewen Shu, and Hongyan Fu
Opt. Express 27(16) 23274-23281 (2019)

Optical fiber strain sensor with high precision and extended dynamic range based on a coupled optoelectronic oscillator

Danqi Feng, Yangxu Tang, Ya Gao, and Ming Deng
Opt. Express 31(5) 8927-8936 (2023)

Simultaneous interrogation of multiple fiber Bragg grating temperature sensors using a microwave photonic approach

Maria I. Comanici, Jingjing Hu, Parisa Moslemi, and Lawrence R. Chen
Appl. Opt. 57(28) 8338-8342 (2018)

Temperature and strain simultaneous sensing measurement based on an all-fiber Mach-Zehnder interferometer and fiber Bragg grating

Junjie Zhu, Wei He, Shaode Li, Zhihan Li, and Lianqing Zhu
Appl. Opt. 62(25) 6661-6671 (2023)