Abstract
Carbon dioxide (CO2) trace gas detection based on quartz enhanced photoacoustic spectroscopy (QEPAS) using a distributed feedback diode laser operating at λ=2 μm is performed, with a primary purpose of studying vibrational relaxation processes in the CO2-N2-H2O system. A simple model is developed and used to explain the experimentally observed dependence of amplitude and phase of the photoacoustic signal on pressure and gas humidity. A (1σ) sensitivity of 110 parts-per-million (with a 1 s lock-in time constant) was obtained for CO2 concentrations measured in humid gas samples.
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07.07.Df; 42.62.Fi; 82.80.Kq; 42.55.Px
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Wysocki, G., Kosterev, A. & Tittel, F. Influence of molecular relaxation dynamics on quartz-enhanced photoacoustic detection of CO2 at λ =2 μm. Appl. Phys. B 85, 301–306 (2006). https://doi.org/10.1007/s00340-006-2369-9
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DOI: https://doi.org/10.1007/s00340-006-2369-9