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2f-wavelength modulation Fabry-Perot photothermal interferometry.

Johannes P Waclawek, Volker C Bauer, Harald Moser

    Optics Express
    |December 14, 2016
    PubMed
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    This study presents a new trace gas sensor using photothermal interferometry for sensitive sulfur dioxide detection. The compact, robust sensor achieved a minimum detection limit of 1 part per million, demonstrating potential for miniaturization.

    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Environmental Sensing

    Background:

    • Accurate trace gas detection is crucial for environmental monitoring and industrial safety.
    • Existing methods often require complex setups or lack sensitivity for specific applications.
    • Photothermal interferometry offers a promising label-free approach for gas sensing.

    Purpose of the Study:

    • To develop and demonstrate a compact, robust trace gas sensor based on photothermal interferometry.
    • To investigate the sensor's performance for selective sulfur dioxide detection.
    • To assess the potential for sensor miniaturization and improved sensitivity.

    Main Methods:

    • Utilized a Fabry-Perot interferometer with wavelength modulation and second harmonic detection.

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  • Employed a quantum cascade laser as the mid-infrared excitation source and a near-infrared laser diode as the probe source.
  • Integrated a compact, low-volume gas cell into a robust, moveless setup.

    • Main Results:

    • Achieved a 1 σ minimum detection limit of approximately 1 part per million by volume (ppmv) for sulfur dioxide.
    • Successfully detected sulfur dioxide at its absorption band centered at 1379.78 cm-1.
    • Demonstrated the sensor's capability for selective gas detection with a robust and compact design.

    Conclusions:

    • The developed photothermal interferometry sensor shows high potential for sensitive and selective trace gas detection.
    • The sensor's compact design and moveless setup are advantageous for practical applications.
    • Further miniaturization to a few mm3 sample volume is feasible, with potential for enhanced sensitivity.