20 February 2018 Measurement of the aerosol absorption coefficient with the nonequilibrium process
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Abstract
On the basis of the conventional Jamin interferometer,the improved measuring method is proposed that using a polarization type reentrant Jamin interferometer measures atmospheric aerosol absorption coefficient under the photothermal effect.The paper studies the relationship between the absorption coefficient of atmospheric aerosol particles and the refractive index change of the atmosphere.In Matlab environment, the variation curves of the output voltage of the interferometer with different concentration aerosol samples under stimulated laser irradiation were plotted.Besides, the paper also studies the relationship between aerosol concentration and the time required for the photothermal effect to reach equilibrium.When using the photothermal interferometry the results show that the time required for the photothermal effect to reach equilibrium is also increasing with the increasing concentration of aerosol particles,the absorption coefficient and time of aerosol in the process of nonequilibrium are exponentially changing.
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Liang Li, Liang Li, Jingxuan Li, Jingxuan Li, Hailong Bai, Hailong Bai, Baosheng Li, Baosheng Li, Shanlin Liu, Shanlin Liu, Yang Zhang, Yang Zhang, } "Measurement of the aerosol absorption coefficient with the nonequilibrium process", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 106971N (20 February 2018); doi: 10.1117/12.2314983; https://doi.org/10.1117/12.2314983
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