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Multichannel continuous-wave fiber cavity ringdown gas sensing utilizing frequency-shifted interferometry.

Z Y Yang, C F Cheng, H Lv

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    A new multichannel continuous-wave (CW) fiber cavity ringdown (FCRD) gas sensing method using frequency-shifted interferometry (FSI) offers a cost-effective and stable approach for detecting gas concentrations with high sensitivity and precision.

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    Area of Science:

    • Optical Sensing
    • Spectroscopy
    • Analytical Chemistry

    Background:

    • Conventional fiber cavity ringdown (FCRD) gas sensing relies on pulsed light sources and time-domain measurements.
    • Existing methods can be complex and costly, limiting multichannel applications.
    • There is a need for more efficient and sensitive gas detection techniques.

    Purpose of the Study:

    • To introduce a novel multichannel continuous-wave (CW) fiber cavity ringdown (FCRD) gas sensing method.
    • To demonstrate the feasibility of using frequency-shifted interferometry (FSI) for spatial domain intensity decay measurements.
    • To evaluate the performance of the proposed system for gas concentration detection.

    Main Methods:

    • Developed a multichannel CW-FCRD system integrating frequency-shifted interferometry (FSI).
    • Measured gas concentration by analyzing intensity decay rates in the spatial domain across different cavities.
    • Experimentally validated the system using acetylene gas in a two-channel setup (0%-1% concentration range).

    Main Results:

    • Established a linear relationship between acetylene concentration and absorption loss, proportional to intensity decay rate.
    • Achieved high measurement resolutions of 3.871%/dB and 3.658%/dB.
    • Demonstrated the system's capability for multichannel gas detection with high sensitivity and precision.

    Conclusions:

    • The proposed FSI-FCRD method offers a low-cost, high-sensitivity, high-precision, and stable alternative for multichannel gas sensing.
    • This technique overcomes limitations of conventional time-domain FCRD methods.
    • The system shows significant potential for various gas detection applications.