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Influence of molecular relaxation dynamics on quartz-enhanced photoacoustic detection of CO2 at λ =2 μm

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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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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX, 77251, USA

    G. Wysocki, A.A. Kosterev & F.K. Tittel

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  1. G. Wysocki
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  2. A.A. Kosterev
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  3. F.K. Tittel
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Correspondence to G. Wysocki.

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PACS

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

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