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Multiplexed fiber Fabry-Perot temperature sensor system using white-light interferometry.

Yichao Chen, Henry F Taylor

    Optics Letters
    |November 21, 2007
    PubMed
    Summary
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    A new monitoring system achieves 0.013°C resolution for fiber Fabry-Perot interferometer (FFPI) temperature sensors. This system uses dual interferometers to accurately track temperature changes, enabling multiplexing of multiple sensors.

    Area of Science:

    • Optical Engineering
    • Sensor Technology
    • Metrology

    Background:

    • Fiber Fabry-Perot interferometers (FFPIs) are sensitive to temperature changes.
    • Accurate monitoring of FFPIs is crucial for various applications.
    • Existing monitoring systems may face limitations in resolution or stability.

    Purpose of the Study:

    • To develop and demonstrate a novel monitoring system for FFPI temperature sensors.
    • To achieve high-resolution temperature measurements using FFPIs.
    • To explore the feasibility of multiplexing multiple FFPI sensors.

    Main Methods:

    • Utilized a broadband light source and a scanned Michelson interferometer to generate a fringe pattern from the FFPI.
    • Employed a second Michelson interferometer with a distributed-feedback laser to compensate for scanning mirror translation rate variations.

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  • Demonstrated coherence multiplexing of three FFPI sensors.

    • Main Results:

    • Achieved a temperature resolution of 0.013 degrees C (0.0025 fringe).
    • The temporal position of the fringe pattern directly correlates with changes in the FFPI's optical length.
    • Successfully demonstrated the multiplexing of three FFPI sensors.

    Conclusions:

    • The novel monitoring system offers high-resolution temperature sensing capabilities.
    • The system's design effectively corrects for external perturbations, enhancing measurement accuracy.
    • Coherence multiplexing shows potential for scalable, multi-point temperature monitoring with FFPI sensors.