The influence of biological activity on the extinction properties of bioparticle materials remains unclear, despite its significance. In this work, according to the alterations in the absorption functional groups and the monomer shape of bioparticles before and after deactivation, the complex refractive indices are obtained using the Kramers-Kronig relation, and the mass extinction coefficients of non-spherical bioparticle aggregates are calculated using the discrete dipole approximation method and verified by smoke box experiments. The results show that the main reason for the decrease of extinction performance is the decrease of scattering ability. For future research with the non-spherical bioparticle aggregates, it would be valuable to consider the monomer shape for quantitative determination of activity based on the mass extinction coefficients.
With the widespread application of photoelectric detection systems, light attenuation materials that affect imaging and detection performance have received increasing attention. As a novel type of light attenuation materials, biological extinction material has the advantages of low preparation cost, environmental protection, non-toxic, easy degradation, and broad extinction band. This paper mainly introduces the research status of biological extinction materials from two aspects: the extinction characteristics of biological materials and the deposition and diffusion of biological aerosols. In order to promote the research and application transformation of biological extinction materials, comprehensively understand the research status of wide band biological extinction materials, and further optimize the extinction performance of biological aerosols in ultraviolet (UV), visible, infrared (IR) and other bands, the research progress in the material preparation and optical constant measurement of biological extinction materials, modeling of biological particle aggregation structure, extinction performance calculation, deposition and diffusion calculation simulation and related experiments are summarized. In view of the challenges in the study of biological extinction materials, perspectives on future material modification optimization, extinction band expanding, and improving the aerodynamic characteristics are provided.
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