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Signal processing in pulsed photoacoustic detection of traces by means of a fast Fourier transform-based method

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1 Author(s)
Slezak, Veronica ; Centro de Investigaciones en Láseres y Aplicaciones (CITEFA-CONICET), San Juan Bautista de La Salle 4397 (1603), Villa Martelli, Buenos Aires, Argentina

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This work describes a simple numerical procedure which, applied to a digitally recorded signal, allows the recovery of a spectrum of higher-frequency resolution than the direct use of the fast Fourier transform alone. The advantages of the method and its limitations are analyzed in applications to theoretical functions. The particular use in pulsed photoacoustic spectroscopy is shown when a low concentration (5 ppmV) NO2–air mixture is monitored upon irradiation with visible laser pulses (∼8 ns full width at half maximum). This way, the shape of the resonance peak is determined with high precision. © 2003 American Institute of Physics.

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Review of Scientific Instruments  (Volume:74 ,  Issue: 1 )