Differential absorption measurements of the NO2, SO2 atmospheric pollutants

Angela Staicu; Mihail-Lucian Pascu; Doina Cristu

doi:10.1117/12.203510

8 March 1995 Differential absorption measurements of the NO₂, SO₂ atmospheric pollutants

Angela Staicu, Mihail-Lucian Pascu, Doina Cristu

Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995) https://doi.org/10.1117/12.203510
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania

Abstract

Differential absorption measurements made in laboratory on air samples containing NO₂ and SO₂ atmospheric pollutants are reported. This type of measurement is necessary to calibrate remote sensing equipment conceived to monitor NO₂ and SO₂ in open atmosphere using LIDAR techniques and to perform preliminary laboratory studies on differential absorption specific to NO₂ and SO₂ molecules. To monitor the mentioned pollutants, a nitrogen laser pumped tunable dye laser was used, the laser pulse having the following characteristics: energy per pulse 40 (mu) J, repetition rate 5 pps, pulse time width 10 ns. The dye wavelengths used to detect NO₂ were (lambda) _on equals 435.1 nm, (lambda) _off equals 432.6 nm obtained from POPOP in DMSO and the spectral bandwidth was 0.7 nm; for SO₂, (lambda) _on equals 298 nm, (lambda) _off equals 299.5 nm and the spectral bandwidth was 0.2 nm, the laser beam being obtained from R6G and further SHG by an ADP crystal. The concentration interval for NO₂ detection was 18.4 ppm to 26.4 ppm, whereas the measurements for SO₂ pollutant were performed at 6.4 ppm. The studied gases were home made and the samples pollutant concentration was measured by mass spectrometry.

Citation Download Citation

Angela Staicu, Mihail-Lucian Pascu, and Doina Cristu "Differential absorption measurements of the NO₂, SO₂ atmospheric pollutants", Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); https://doi.org/10.1117/12.203510

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