Abstract
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.
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