Interrogation of fiber grating sensor arrays with a wavelength-swept fiber laser

TLDR

We demonstrate a novel application of a wavelength‑swept fiber laser to interrogate fiber Bragg grating sensor arrays. The laser delivers >3 mW power with <0.1‑nm spectral resolution over a 28‑nm span, enabling time‑interval counting for strain interrogation. Static–dynamic strain measurements achieved a resolution of 0.47 µm rms at a 250 kHz sampling rate.

Abstract

We demonstrate a novel application of a wavelength-swept fiber laser to fiber Bragg grating sensor-array interrogation. The laser provides high signal powers of >3 mW with <0.1-nm spectral resolution over a 28-nm wavelength span. Using time-interval counting, we demonstrate static–dynamic strain measurements with a resolution of 0.47 µ? rms at a sampling rate of 250??Hz.