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Optical sensor network interrogation system based on nonuniform microwave photonic filters.

Dongrui Xiao, Liyang Shao, Chao Wang

    Optics Express
    |March 17, 2021
    PubMed
    Summary

    A novel microwave photonic filter platform enables simultaneous interrogation of diverse optical fiber sensors. This centralized system decodes sensor data from temporal impulse responses, offering a scalable solution for complex sensor networks.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Microwave Photonics

    Background:

    • Traditional optical sensor interrogation systems often lack versatility and scalability.
    • Integrating multiple sensor types into a single network presents significant technical challenges.

    Purpose of the Study:

    • To propose and demonstrate a generic optical fiber sensor network interrogation platform based on microwave photonic delay-line filter technology.
    • To enable simultaneous interrogation of various optical sensors using a centralized approach.

    Main Methods:

    • Utilizing nonuniformly spaced microwave photonic delay-line filters.
    • Converting sensor information into variations of delay time and amplitude within filter taps.
    • Decoding measured information from the complex temporal impulse response of the filter.
    • Employing inverse Fourier transform of the filter frequency response for data retrieval.

    Main Results:

    • Successful verification through simulations and experimental demonstrations.
    • Demonstrated simultaneous interrogation of four different types of optical sensors (twist, lateral pressure, transversal loading, temperature).
    • Exhibited good linearity between temporal impulse response variations and measured physical parameters.
    • Achieved sensitivities: -2.130×10-5 a.u/degree, 6.1039 ps/kPa, -1.9146×10-5 a.u/gram, and 5.1497 ps/°C.

    Conclusions:

    • The proposed platform offers a centralized and versatile solution for interrogating diverse optical sensors.
    • The technology is easily expandable for larger optical sensor networks.
    • This approach overcomes limitations of conventional interrogation systems by providing a unified platform.