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Cantilever enhanced photoacoustic detection of carbon dioxide using a tunable diode laser source

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Abstract

Recently introduced cantilever enhanced photoacoustic sensing has been applied to the tunable diode laser-based trace gas detection. The pressure variations due to the photoacoustic signal are detected with a miniature silicon cantilever, whose displacement is measured with a compact Michelson type laser interferometer. The system has been used to detect carbon dioxide (CO2) at 1572 nm with a distributed feedback diode laser. With a new photoacoustic cell, that was optimized for the laser sources, a normalized noise equivalent sensitivity of 1.7×10-10 cm-1W/\(\sqrt{Hz}\) at atmospheric pressure was realized. The result obtained in the non-resonant operation mode is at least 10 times better than in previous reports. The future improvements of the technique are also discussed.

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Authors and Affiliations

  1. Department of Physics, University of Turku, 20014, Turku, Finland

    V. Koskinen, J. Fonsen, K. Roth & J. Kauppinen

  2. Gasera Ltd, Tykistökatu 4, 20520, Turku, Finland

    K. Roth

Authors
  1. V. Koskinen
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  2. J. Fonsen
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  3. K. Roth
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  4. J. Kauppinen
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Corresponding author

Correspondence to V. Koskinen.

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PACS

07.07.Df; 42.55.Px; 82.80.Kq

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Koskinen, V., Fonsen, J., Roth, K. et al. Cantilever enhanced photoacoustic detection of carbon dioxide using a tunable diode laser source. Appl. Phys. B 86, 451–454 (2007). https://doi.org/10.1007/s00340-006-2560-z

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  • DOI: https://doi.org/10.1007/s00340-006-2560-z

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