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Resonant photoacoustic gas sensing by PC-based audio detection

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Abstract

A new and simple technique for data acquisition and processing in an experiment of resonant photoacoustic detection is presented. It is based on the use of the sound card of a desk or laptop computer for digitizing the signal from a microphone enclosed in an acoustical cavity and further processing by a high-resolution fast Fourier transform. The system is applied to the detection of NO2 traces in air at atmospheric pressure with an amplitude-modulated visible laser and the results are compared with those obtained by a lock-in amplifier. For the same acquisition time the results for the ultimate measurable concentration were 50 ppbV with this system and 130 ppbV with a lock-in amplifier.

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Authors and Affiliations

  1. Laboratorio Láser, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850 (1063), Ciudad de Buenos Aires, Argentina

    G. Santiago

  2. Centro de Investigaciones en Láseres y Aplicaciones (CITEFA-CONICET), Juan Bautista de La Salle 4397 (1603), Villa Martelli, Buenos Aires, Argentina

    V. Slezak & A.L. Peuriot

Authors
  1. G. Santiago
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  2. V. Slezak
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  3. A.L. Peuriot
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Correspondence to G. Santiago.

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PACS

42.62.Fi; 82.80.Kq; 43.60.+d

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Santiago, G., Slezak, V. & Peuriot, A. Resonant photoacoustic gas sensing by PC-based audio detection. Appl. Phys. B 77, 463–465 (2003). https://doi.org/10.1007/s00340-003-1263-y

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  • DOI: https://doi.org/10.1007/s00340-003-1263-y

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