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Accounting for humidity of exhaled air for retrieving gaseous biomarkers

Abstract

In this work, we use numerical simulation to estimate errors of the differential-absorption retrieval of concentrations of such gaseous biomarkers as CH4, CO, NH3, N2O, C2H6, and H2S from the absorption spectra of a three-component gas mixture in the 2–4 μm spectral region. The gas mixture is supposed to simulate exhaled air. The absorption spectra were calculated with a resolution of 2 cm−1 using the HITRAN database. The influence of subtraction of the water vapor absorption spectrum from the simulated spectrum on the retrieval error is studied. The water vapor concentration in the mixture in calculations of its contribution to the spectrum was determined from the absorption measured at 3800 cm−1.

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Correspondence to O. Yu. Nikiforova.

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Original Russian Text © O.Yu. Nikiforova, Yu.N. Ponomarev, A.I. Karapuzikov, 2013, published in Optica Atmosfery i Okeana.

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Nikiforova, O.Y., Ponomarev, Y.N. & Karapuzikov, A.I. Accounting for humidity of exhaled air for retrieving gaseous biomarkers. Atmos Ocean Opt 26, 550–555 (2013). https://doi.org/10.1134/S1024856013060110

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Keywords

  • Optical Parametric Oscillator
  • Water Vapor Absorption
  • Continuum Absorption
  • HITRAN Database
  • Gaseous Marker