20 May 2009 Application of FTIR spectrometer to the test of extinction performance of water fog with infrared emission
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Abstract
The infrared spectrum, granularity distribution and mass concentration of water fog were tested by a FTIR spectrometer, laser granularity device and other apparatus in a 75.6m3 test room. The transmittance and mass extinction coefficients of water fog with infrared emission were tested and analyzed within 3~5μm and 8~14μm wave band. The extinction efficiency factors of water fog with 3~14μm infrared were calculated according to Van der Hulst formula and the curve was drawn to show the factors varied with the incident wavelength. According to the experimental results, the water fog has a good extinction performance to infrared emission and the extinction performance is obviously influenced by incident wavelength. For example, the extinction efficiency factor increases with the incident wavelength within 3~5μm but has the least at 10.4μm and has the maximum at 13μm. By the analysis, the average mass extinction coefficient of the water fog between 3μm and 5μm infrared wave band is 0.110m2/g while between 8μm and 14μm is 0.102m2/g. The experimental result tested by FTIR spectrometer is consistent with theoretic result calculated according to Van der Hulst formula, so that the method to test the mass extinction coefficient of water fog with infrared emission by FTIR spectrometer is viable and scientific, while Van der Hulst formula may be applied to calculate the extinction efficiency factors of particles from water fog.
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Xuanyu Wang, Xuanyu Wang, } "Application of FTIR spectrometer to the test of extinction performance of water fog with infrared emission", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 72833F (20 May 2009); doi: 10.1117/12.828773; https://doi.org/10.1117/12.828773
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