Soot Particles Interference Mechanism On Measuring No₂concentration Using UV

With the rapid development of world economy, the pollution of the environment andmaintain ecological balance caused great attention of the world. Ultraviolet spectroscopicmethod not only has the advantage of other method but is an effective method identifyingthe compounds and measuring the molecular structure. Ultraviolet absorption method onthe detection of pollution gas emission concentration should remove the dust, otherwise itwill cause great measuring error. Study the different properties of the particles on thepollution gas concentration measurement results of interference mechanism, and analyzethe effects of different concentration particles, in order to correct the deviation ofscattering intensity.Introducing the harm ofNO2, pollution status and the significance of thegovernance. Gaseous nitrogen dioxide are generally contains solid particles. Particles onultraviolet source emits light have the function of scattering and absorption, irradiate tothe measured gas on all wavelengths of the original light intensity decays, leading therelationship of wavelength measurement of light intensity, the original intensity andgaseous nitrogen dioxide concentration deviates from the theoretical formula, resulting arelatively large measurement error. Ultraviolet absorption method using Mie scatteringtheory, in order to analyze the influence of soot on monitoring results of gas from the flue,first of all according to the set dust concentration, the diameter of particle calculate dustabsorption spectrum.Due to the distance between the particles and the photoelectric sensor, whereby theparticles in different locations in the pipeline, sensor receives the different scatteringangle range of distal and proximal particles. So the intensity ratio is also different, themeasurement results have a certain impact. Measurement error have a relationship of thedistribution of particle size. particle size, The distance between particle size and sensor.Finally, summarized the main contents of the paper, pointed out the shortcomings, andgave some suggestion for further study.Figure26; Table17; Reference54...