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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Simultaneous temperature and pressure sensing based on a single optical resonator.

Yanran Wu, Bing Duan, Jien Song

    Optics Express
    |June 29, 2023
    PubMed
    Summary

    We developed a stable, ultrahigh-quality packaged microbubble resonator (PMBR) sensor for simultaneously measuring temperature and pressure. This dual-parameter sensor precisely decouples measurements using two resonant modes, enabling accurate multi-parameter sensing in one device.

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    Area of Science:

    • Optics and Photonics
    • Sensor Technology
    • Materials Science

    Background:

    • Microbubble resonators offer high sensitivity for optical sensing applications.
    • Simultaneous measurement of multiple physical parameters is challenging in a single device.
    • Existing sensors often require complex configurations or multiple sensing elements.

    Purpose of the Study:

    • To propose and demonstrate a novel dual-parameter sensor for simultaneous temperature and pressure detection.
    • To utilize a single packaged microbubble resonator (PMBR) for enhanced sensing capabilities.
    • To achieve precise decoupling of temperature and pressure measurements.

    Main Methods:

    • Fabrication of an ultrahigh-quality packaged microbubble resonator (PMBR) with Q-factor ~10^7.
    • Selection of two resonant modes with distinct sensing characteristics for parallel detection.
    • Implementation of a sensing matrix algorithm to decouple temperature and pressure signals.
    • Long-term stability testing and error analysis of the sensor's performance.

    Main Results:

    • The PMBR sensor demonstrated long-term stability with a maximum wavelength shift of 0.2056 pm.
    • Mode-1 exhibited sensitivities of -10.59 pm/°C (temperature) and 0.1059 pm/kPa (pressure).
    • Mode-2 showed sensitivities of -7.69 pm/°C (temperature) and 0.1250 pm/kPa (pressure).
    • Decoupled measurements achieved root mean square errors of ~0.12 °C for temperature and ~6.48 kPa for pressure.

    Conclusions:

    • The proposed dual-parameter sensor based on a single PMBR enables simultaneous and accurate measurement of temperature and pressure.
    • The use of two resonant modes and a sensing matrix effectively decouples the parameters.
    • This technology holds significant potential for multi-parameter sensing in compact optical devices.