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Open-path spectroscopic methane detection using a broadband monolithic distributed feedback-quantum cascade laser

Anna P M Michel, Jason Kapit, Mark F Witinski

    Applied Optics
    |April 18, 2017
    PubMed
    Summary
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    This study presents an open-path methane sensor for measuring greenhouse gas emissions from various sources. The portable system achieved high precision, enabling effective environmental monitoring of methane.

    Area of Science:

    • Environmental Science
    • Atmospheric Chemistry
    • Spectroscopy

    Background:

    • Methane is a potent greenhouse gas with significant natural and anthropogenic sources.
    • Accurate measurement of methane is crucial for understanding its environmental impact.
    • Existing methods may be limited in diverse field applications.

    Purpose of the Study:

    • To develop and demonstrate an open-path methane sensor for versatile environmental monitoring.
    • To assess the sensor's performance in detecting ambient methane levels.
    • To create a portable, off-grid methane sensing solution.

    Main Methods:

    • Utilized a broadband monolithic distributed feedback-quantum cascade laser array as the light source.
    • Employed a bistatic configuration with two telescopes for a 50 m open-path.

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  • Applied direct-absorption spectroscopy with intrapulse tuning for methane detection.

    • Main Results:

    • Successfully detected ambient methane levels across the 50 m path.
    • Achieved instrument precision of 70 ppb (100 s averaging) and 90 ppb (10 s averaging).
    • Designed the sensor for off-grid operation using rechargeable batteries, solar, and wind power.

    Conclusions:

    • The developed open-path sensor is effective for measuring methane from diverse sources.
    • The system's portability and off-grid capability enhance its applicability in remote environments.
    • This technology offers a valuable tool for environmental research and emissions monitoring.