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Dual-logarithmic demodulation method application in a wide gas optical thickness range.

Zhifeng Zhang, Jun Chang, Jiachen Sun

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    A new dual-logarithmic demodulation method improves direct absorption spectroscopy (DAS) for gas detection. This technique offers robust and linear measurements across a wide optical thickness range, enhancing accuracy in site applications.

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    Area of Science:

    • Spectroscopy
    • Analytical Chemistry
    • Optical Sensing

    Background:

    • Direct absorption spectroscopy (DAS) is vital for in-situ gas concentration detection.
    • Dual-beam subtraction, a common DAS demodulation method, struggles with absolute absorption curve nonlinearization over wide optical thickness ranges.

    Purpose of the Study:

    • To introduce a real-time and practical dual-logarithmic demodulation method for DAS.
    • To demonstrate the robustness and linearity of this new method, especially in high optical thickness regimes.

    Main Methods:

    • Development and implementation of a dual-logarithmic demodulation technique for DAS.
    • Experimental validation and simulation of the method using acetylene at 1532.83 nm under specific temperature and pressure conditions.
    • Comparison with the dual-beam subtraction method.

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    Main Results:

    • The dual-logarithmic method proves robust for optical thicknesses significantly exceeding the linear region.
    • An optical thickness peak error of only 1.18% was observed between the dual-logarithmic system and simulation.
    • Satisfactory linearity (R-squared=0.9989) was maintained for acetylene optical thickness peaks ranging from 0.0252 to 2.5335.

    Conclusions:

    • The proposed dual-logarithmic demodulation method overcomes limitations of traditional dual-beam subtraction in DAS.
    • This advancement enables more accurate and reliable gas concentration measurements in diverse site applications, particularly under challenging optical conditions.