Open AccessStatic pure strain sensing using dual–comb spectroscopy with FBG sensors
Author(s) -
Ruixue Zhang,
Zebin Zhu,
Guanhao Wu
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.034269
Subject(s) - fiber bragg grating , materials science , optics , sensitivity (control systems) , spectroscopy , radio frequency , fiber optic sensor , optical fiber , spectral resolution , spectral line , optoelectronics , physics , electronic engineering , telecommunications , quantum mechanics , astronomy , computer science , engineering
We propose a method to precisely characterize the optical response of a fiber Bragg grating (FBG) sensor for static strain sensing by using dual-comb spectroscopy (DCS). By digitally post-correcting the mutual noise between the two combs, a robust and pure strain sensing system is achieved by compensating for the temperature-induced frequency shift of the FBG sensor. The comb-resolved radio-frequency (RF) spectra generated by DCS are obtained. Meanwhile, the stability of the central Bragg frequency of the FBG-reflected spectrum in the RF domain is 0.315 kHz, which is better than the difference of repetition rate (1 kHz). A reference FBG is used for detecting and compensating for the temperature-induced central frequency drift. Finally, a spectral sensitivity of 0.85 pm/µɛ with 0.8 µɛ static strain resolution is achieved.