Abstract

The absorptivity of soot and methylene blue particles collected on Teflon filters is derived from photoacoustic measurements by least squares fitting a simple expression based on Beer’s law to the experimental data. Refinements of the expression take into account the diffuse reflection of light by the filter substrate, yielding a base 10 absorptivity at 600 nm for soot of 3.00 ± 0.37 m2/g. This value is in close agreement with the result of transmission measurements performed on the same samples (3.08 ± 0.05 m2/g).

© 1982 Optical Society of America

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Appl. Opt. 21(3) 370-370 (1982)

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