Detection of atmospheric pollutants by pulsed photoacoustic spectroscopy

Miruna Roman; Mihail-Lucian Pascu; Angela Staicu

doi:10.1117/12.312740

2 July 1998 Detection of atmospheric pollutants by pulsed photoacoustic spectroscopy

Miruna Roman, Mihail-Lucian Pascu, Angela Staicu

Proceedings Volume 3405, ROMOPTO '97: Fifth Conference on Optics; (1998) https://doi.org/10.1117/12.312740
Event: ROMOPTO '97: Fifth Conference on Optics, 1997, Bucharest, Romania

Abstract

Pulsed laser photoacoustic detection of NO₂ and SO₂ is reported. The laser source is a pulsed molecular nitrogen laser emitting at 337.1 nm. The average energy per pulse is about 350 (mu) J and the pulse duration 10 nsec. For detection we used a piezoelectric transducer (TUSIM-N.I.M.P., resonance frequency 4 MHz) and an electret condenser microphone (Trevi EM 27). The photoacoustic cell was a nonresonant one, with a cylindrical shape. The laser beam was centered along the cylinder axis. Linear dependence of the photoacoustic signal on pollutant pressure was obtained. This linearity is in a good agreement with theoretical considerations. The photoacoustic signal was measured for pollutants pressure between 1 torr and 100 torr for NO₂ and between 35 torr and 100 torr for SO₂.

Citation Download Citation

Miruna Roman, Mihail-Lucian Pascu, and Angela Staicu "Detection of atmospheric pollutants by pulsed photoacoustic spectroscopy", Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998); https://doi.org/10.1117/12.312740

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