Abstract

In this study, a method was presented to accurately obtain the extinction characteristics of the non-spherical biological particle aggregates. Based on the multi-sphere particle model of non-spherical particles, a randomly oriented aggregation model was firstly built to construct the aggregates. The discrete-dipole approximation method was used to calculate the extinction characteristics of aggregates in the 3–14 µm waveband. The average mass extinction coefficients of three materials are 0.802 m²/g, 0.907 m²/g, and 0.866 m²/g in the 3–5 µm waveband and 0.590 m²/g, 0.402 m²/g, and 0.523 m²/g in the 8–14 µm band, respectively. Smoke chamber experimental results are in good agreement with theoretical analyses.

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