High-Speed, High-Resolution On-Board Optical Time Stretch- based FBG Interrogation System for SHM
Year: 2026
Type: article
Abstract: A key challenge in Fiber Bragg Grating (FBG) interrogation for Structural Health Monitoring (SHM) is the simultaneous achievement of high wavelength resolution, high sensing capacity, and high interrogation rate within a compact and scalable system. In this work, an Optical Time Stretch (OTS)-based FBG interrogator is proposed to relax this trade-off by combining a recirculating-loop dispersion module with a Time-to-Digital Converter (TDC)-based electronic readout. The architecture enables large accumulated dispersion and direct real-time temporal acquisition, while remaining compatible with future extensions toward combined TDM–WDM multiplexing. Static validation on strain and temperature sensing yields equivalent time–strain and time–temperature sensitivities of 25.85 ± 0.81 ps/μϵ and 0.85 ± 0.06 ns/°C, respectively, with picometer-level wavelength resolution. A first dynamic proof-of-concept also demonstrates impact detection at a scan rate of 51 kHz, confirming the potential of the proposed system for high-resolution SHM and acoustic/impact monitoring.
DOI: 10.58286/33740
Authors: Giovanni Vacirca, Sylvain Magne, Nazih Mechbal
Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, Laboratoire d'Intégration des Systèmes et des Technologies, Conservatoire National des Arts et Métiers, Centre National de la Recherche Scientifique, Arts et Métiers, Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
Language: English
Topic: Advanced Fiber Optic Sensors
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7169598746