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Detection of urban O3, NO2, H2CO, and SO2 using Fourier transform spectroscopy

dc.contributor.authorVandaele, A.C.
dc.contributor.authorCarleer, M.
dc.contributor.authorColin, R.
dc.contributor.authorSimon, P.C.
dc.date1993
dc.date.accessioned2017-06-02T11:19:53Z
dc.date.available2017-06-02T11:19:53Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5655
dc.descriptionConcentrations of SO2, NO2, H2CO, and O3 have been measured regularly since October 1990 at the urban site of the Campus of the Universite Libre de Bruxelles, using the differential optical absorption spectroscopy (DOAS) technique associated with a Fourier Transform Spectrometer. The experimental set up has already been described elsewhere (Vandaele et al., 1992). It consists of a source (either a high pressure xenon lamp or a tungsten filament) and an 800 m long path system. The spectra are recorded in the 26,000 - 38,000 cm-1 and 14,000 - 30,000 cm-1 spectral regions, at the dispersion of 7.7 cm-1. The analytical method of the DOAS technique is based on the fact that in atmospheric measurements, it is impossible to obtain an experimental blank spectrum. Therefore, the Beer-Lambert law has to be rewritten as: I = I′oenΔσd where I is the measured intensity, Io the measured intensity from which all absorption structures have been removed, n the concentration, d the optical path length, and Δσ the differential absorption cross section of the molecule. Numerous methods for determining I′o exist. Fourier transform filtering has been used in this work. This method defines I′o as the inverse Fourier transform of the lower frequencies portion of the power spectrum of the experimental data. A least squares procedure is then applied in order to determine the concentration of the desired molecules.
dc.languageeng
dc.titleDetection of urban O3, NO2, H2CO, and SO2 using Fourier transform spectroscopy
dc.typeConference
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeAbsorption spectroscopy
dc.subject.freeAtmospheric composition
dc.subject.freeMeasurements
dc.subject.freeNitrogen oxides
dc.subject.freeOzone
dc.subject.freeSulfur dioxide
dc.subject.freeBelgium
dc.subject.freeFourier transform spectroscopy
dc.subject.freeOptical diagnostic techniques
dc.subject.freeAir pollution
dc.source.titleProceedings of SPIE 1715: Optical Methods in Atmospheric Chemistry
dc.source.volume1715
dc.source.page288-292
Orfeo.peerreviewedNo
dc.identifier.doi10.1117/12.140187
dc.identifier.scopus2-s2.0-0027252346
dc.source.editorSchiff, H.I.
dc.source.editorPlatt, U.


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