Photoacoustic detection of NO2 traces with CW and pulsed green lasers |
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| Authors: | Ver nica Slezak, Guillermo Santiago,Alejandro L. Peuriot |
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| Affiliation: | a Centro de Investigaciones en Láseres y Aplicaciones (CITEFA-CONICET), San Juan Bautista de La Salle 4397 (1603), Villa Martelli, Buenos Aires, Argentina;b Laboratorio Láser, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850 (1063), Ciudad de Buenos Aires, Argentina |
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| Abstract: | Photoacoustic NO2 traces detection based on continuous and pulsed lasers emitting at 532 nm is presented. Both systems were calibrated with known NO2-pure air mixtures. A minimum detectable volume concentration of 20 parts in 109 (S/N=1) and 15 parts in 109 for the resonant and pulsed regime, respectively, were obtained. These values were limited by electrical and acoustical noise of the microphone and electronics. Measurements of NO2 concentrations in urban air are compared with home-manufactured mixtures. Traces of nitrogen dioxide from two different car exhausts are also detected and quantitatively assigned from the calibration curves. |
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| Keywords: | Trace gas analysis Resonant photoacoustic spectroscopy Pulsed photoacoustic spectroscopy Nitrogen dioxide Nd:YAG lasers with second harmonic generation |
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