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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Hybrid wavelength- and frequency-division multiplexed fiber laser sensor array.

Shengchun Liu, Xue Dong, Xiujuan Yu

    Optics Letters
    |January 7, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A novel hybrid multiplexing scheme enhances fiber laser sensor arrays by combining wavelength-division and frequency-division multiplexing. This method significantly increases sensor capacity and reduces system cost for large-scale monitoring applications.

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    Area of Science:

    • Optoelectronics and Photonics
    • Sensor Technology
    • Fiber Optics

    Background:

    • Fiber laser sensor arrays are crucial for various monitoring applications.
    • Existing multiplexing schemes face limitations in scalability and cost-effectiveness.
    • Multi-longitudinal-mode fiber lasers offer potential for dense sensor integration.

    Purpose of the Study:

    • To propose and validate a hybrid multiplexing scheme for fiber laser sensor arrays.
    • To combine wavelength-division multiplexing (WDM) and frequency-division multiplexing (FDM) for enhanced sensor capacity.
    • To demonstrate a cost-effective and scalable solution for large-scale sensor networks.

    Main Methods:

    • A hybrid multiplexing system integrating WDM and FDM was designed.
    • Fiber laser sensors with similar wavelengths but different cavity lengths were grouped.
    • Frequency-division multiplexing interrogated sensors within subgroups based on beat frequencies.
    • Dense wavelength-division multiplexers separated different subgroups by operating wavelengths.
    • A 4x4 sensor multiplexing system was experimentally implemented and tested.

    Main Results:

    • Successful interrogation of individual fiber laser sensors within the hybrid system.
    • Accurate extraction of applied strain and temperature data from each sensor.
    • Experimental validation of a 4x4 sensor multiplexing array.
    • Demonstrated significant increase in the number of multiplexed sensors compared to traditional methods.
    • Verified reduction in the weight, volume, and cost per sensor.

    Conclusions:

    • The proposed hybrid WDM/FDM multiplexing scheme is effective for fiber laser sensor arrays.
    • This approach offers a competitive solution for large-scale structural health monitoring and other sensing applications.
    • The system provides enhanced sensor density, reduced cost, and improved scalability.