High-Speed, High-Resolution On-Board Optical Time Stretch-based FBG Interrogation System for SHM
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.
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BibTeX
@article{vacirca2026highspeed,
title = {{High-Speed, High-Resolution On-Board Optical Time Stretch-based FBG Interrogation System for SHM}},
author = {Giovanni Vacirca and Sylvain Magne and Nazih Mechbal},
journal = {e-Journal of Nondestructive Testing},
year = {2026},
month = jul,
doi = {10.58286/33740},
url = {https://cea.hal.science/cea-05753953v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - High-Speed, High-Resolution On-Board Optical Time Stretch-based FBG Interrogation System for SHM
AU - Giovanni Vacirca
AU - Sylvain Magne
AU - Nazih Mechbal
PY - 2026
DA - 2026/07/17
JO - e-Journal of Nondestructive Testing
DO - 10.58286/33740
UR - https://cea.hal.science/cea-05753953v1
AB - 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.
SN - 1435-4934
ER -