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Dynamic computational optical fringe mitigation in tunable laser absorption spectroscopy.

Chu C Teng, Eric J Zhang, Chi Xiong

    Optics Express
    |December 31, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Optical fringing in spectroscopic systems causes background changes, requiring frequent calibration. This study presents a computational method to correct these effects without hardware changes, enabling accurate methane sensing.

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    Area of Science:

    • Optical spectroscopy
    • Photonics
    • Spectrometer calibration

    Background:

    • Fabry-Pérot etalons in optical systems cause unpredictable spectral background changes due to scattering.
    • These spectral fringes necessitate frequent system calibration, limiting measurement accuracy and spectrometer usability.

    Purpose of the Study:

    • To introduce a computational approach for mitigating optical fringing effects in spectroscopic systems.
    • To eliminate the need for frequent hardware calibration by addressing spectral background variations computationally.

    Main Methods:

    • Decomposing complex fringe backgrounds into individual component etalons.
    • Addressing each etalon based on its unique optical characteristics.
    • Applying a computational mitigation strategy without altering system hardware.

    Main Results:

    • Successfully mitigated adverse effects of optical fringing in spectral data.
    • Demonstrated accurate methane concentration measurements using the developed method.
    • Validated the approach on a silicon photonic methane sensor system.

    Conclusions:

    • The proposed computational method effectively corrects optical fringing in spectrometers.
    • Accurate spectral measurements are achievable even with significant optical fringe interference.
    • This approach offers a significant advancement for spectrometers affected by optical scattering.