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Measurement of the Optical Extinction Coefficient of Combustion-Generated Aerosol. Technical Note.


pdf icon Measurement of the Optical Extinction Coefficient of Combustion-Generated Aerosol. Technical Note. (256 K)
Widmann, J. F.; Duchez, J.; Yang, J. C.; Conny, J. M.; Mulholland, G. W.

Journal of Aerosol Science, Vol. 36, No. 2, 283-289, February 2005.

Keywords:

aerosols; extinction; combustion; soot; smoke; carbon

Abstract:

This note describes measurements of the mass-specific extinction coefficient, \'01s, of carbonaceous aerosol produced during hydrocarbon combustion. Measurements of \'01s were obtained by laser extinction at \'02 = 632 nm. The aerosol was generated using a laminar diffusion flame, and the mass-specific extinction coefficient determined as a function of the global equivalence ratio, \'03. The elemental carbon content of the aerosol was also determined with respect to \'03.A relationship was developed between the elemental carbon/total carbon (EC/TC) ratio and \'01s. A simple method of producing laboratory aerosol with controlled EC/TC ratio is also presented.