UV Optical Absorption Spectroscopy And Frequency Filtering For Flue Gas Measurements

Temperature and pressure effects of the main polluted gases' absorption cross-section had been study in this paper. The gases, SO₂,NO,NO₂,NH₃, had characters of approximate periods absorption at some wave band. The frequency filtering is introduced to measure the flue gas.Based on the measurements of absorption cross-section, the absorption characters of the main polluted gases in flue gas were deeply studied, in different conditions. In the experiment of temperature effects in the UV/visible absorption spectra of SO₂, found that there existed approximate periods absorption and the absorption cross-section minished, while the temperature increased. Between 200 and 230 nm, predissociation occurs for the whole wave band. The absorption cross-section minished, while it's pressure increased. And the absorption of NH₃ exhibited an approximate periods. There existed photolysis and polymerization in UV band, while measuring NO₂. The ratio of polymerization was proportion to pressure.The law of optical absorption, and the notion of filter had been introduced. There had two methods for quantity analyzing. Experiment improved that it had better accury and stability.The research and experiments show that the frequency filtering has wide application prospects. The studying of this paper provided theoretic and experimental bases for it.