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8 March 1995 Differential absorption measurements of the NO2, SO2 atmospheric pollutants
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Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995)
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania
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.
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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);

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