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Real-time random grating sensor array for quasi-distributed sensing based on wavelength-to-time mapping and

Jingxuan Liu, Ping Lu, Stephen J Mihailov

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    |January 16, 2019
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    Summary

    A novel random grating sensor array enables real-time, high-resolution quasi-distributed sensing. This system accurately measures temperature and strain using spectral-shaping and wavelength-to-time mapping.

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    Area of Science:

    • Fiber optic sensing
    • Optical instrumentation
    • Photonics

    Background:

    • Quasi-distributed sensing systems are crucial for structural health monitoring.
    • Existing methods often lack real-time capabilities and high resolution.
    • Random gratings offer a unique approach to fiber optic sensing.

    Purpose of the Study:

    • To propose and demonstrate a real-time random grating sensor array for quasi-distributed sensing.
    • To leverage spectral-shaping and wavelength-to-time (SS-WTT) mapping for enhanced performance.
    • To achieve high-resolution interrogation of temperature and strain with improved accuracy.

    Main Methods:

    • Development of a sensor array using multiple random gratings inscribed in a single-mode fiber.
    • Utilizing SS-WTT mapping with a linearly chirped fiber Bragg grating to convert spectral shifts to time delays.
    • Employing time-division multiplexing and correlation-based signal processing for data acquisition and analysis.

    Main Results:

    • Experimental demonstration of a two-random-grating array system.
    • Achieved sensing resolutions of 0.23°C for temperature and 2.5 μϵ for strain.
    • Demonstrated sensing accuracies of 0.11°C for temperature and 1.2 μϵ for strain.

    Conclusions:

    • The proposed random grating sensor array enables real-time quasi-distributed sensing.
    • The system offers significant advantages in terms of high-resolution interrogation and scalability.
    • This technology presents a promising alternative to conventional quasi-distributed sensing methods.