Our institute has recently developed a differential optical absorption spectrometry system called the gas analyzer spectrometer correlating optical absorption differences (GASCOAD), which features as a detector a linear image sensor that uses an artificial light source for long-path tropospheric-pollution monitoring. The GASCOAD, its method of eliminating interference from background sky light, and subsequent spectral analysis are reported and discussed. The spectrometer was used from 7 to 22 February 1993 in Milan, a heavily polluted metropolitan area, to measure the concentrations of SO2, NO2, O3, and HNO2 averaged over a 1.7-km horizontal light path. The findings are reported and briefly discussed.
© 1995 Optical Society of America
F. Evangelisti, A. Baroncelli, P. Bonasoni, G. Giovanelli, and F. Ravegnani, "Differential optical absorption spectrometer for measurement of tropospheric pollutants," Appl. Opt. 34, 2737-2744 (1995)