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High-sensitivity fiber optic hydrogen sensor in air by optimizing a self-referenced demodulating method.

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    This study introduces a new self-referenced demodulating method for fiber optic hydrogen sensors using a WO3-Pd2Pt-Pt composite film. This technique significantly enhances sensor sensitivity and achieves a record low hydrogen detection threshold of 10 ppm at room temperature.

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    Area of Science:

    • Materials Science
    • Chemical Sensing
    • Optical Engineering

    Background:

    • Fiber optic sensors offer advantages for gas detection, but sensitivity and resolution limitations hinder their widespread application.
    • Accurate hydrogen detection is crucial for safety and industrial processes, requiring highly sensitive and reliable sensors.
    • Existing optical hydrogen sensors often struggle with performance at room temperature and ambient air conditions.

    Purpose of the Study:

    • To develop and investigate a self-referenced demodulating method for fiber optic hydrogen sensors.
    • To enhance the sensitivity and resolution of optical hydrogen sensors using a WO3-Pd2Pt-Pt composite film.
    • To achieve a low hydrogen detection threshold at room temperature in air.

    Main Methods:

    • Fabrication of a fiber optic hydrogen sensor utilizing a WO3-Pd2Pt-Pt composite film.
    • Implementation of a self-referenced demodulating technique by using baseline intensity as a sensing parameter.
    • Experimental evaluation of sensor performance, including resolution, sensitivity, and repeatability at room temperature.

    Main Results:

    • The self-referenced demodulating method significantly suppresses sensing signal fluctuations.
    • The sensor demonstrates a resolution of 3 parts per million (ppm) for hydrogen concentrations below 1000 ppm.
    • A hydrogen detection threshold as low as 10 ppm in air at room temperature was achieved, with good repeatability.

    Conclusions:

    • The proposed self-referenced demodulating method effectively improves the performance of fiber optic hydrogen sensors.
    • The WO3-Pd2Pt-Pt composite film-based sensor exhibits unprecedented low-temperature, ambient-air sensitivity.
    • This advancement holds significant potential for diverse applications requiring precise hydrogen monitoring.