Temperature dependence of the absorption spectra of nitrogen oxide, nitrogen dioxide and sulfur dioxide in the application of differential optical absorption spectroscopy

• An experimental set-up has been designed for measurements of differential absorption cross-sections ofgases at different temperatures. Preliminary measurements on NO, NO2 and SO2 have been carried out attemperatures between 20 and 400°C by using spectral resolutions in the range 0.26-0.95 nm. Thesemeasurements show that the differential absorption cross-sections for all three gases decrease continuouslywith increasing temperature. Large relative errors resulted when differential absorption cross-sectionsobtained at room temperature were used in the differential optical absorption spectroscopic technique forevaluation of the concentration of gases at high temperatures. The relative errors were of the order of 70% forSO2 and NOz and of the order of 20% for NO at 400°C.

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NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

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