Infrared Extinction Performance of Randomly Oriented Microbial-Clustered Agglomerate Materials.

Area of Science:

• Atmospheric optics
• Microbiology
• Computational physics

Background:

• Fungal spores (An0429) form complex spatial structures.
• Understanding light-matter interactions in aerosols is crucial for applications.

Purpose of the Study:

• To simulate and analyze the transmittance of 10.6 µm infrared light through aggregated fungal An0429 spores.
• To investigate the impact of various parameters on light attenuation.

Main Methods:

• Cluster aggregation (CCA) model for spatial structure simulation.
• Discrete dipole approximation (DDA) for scattering parameter calculation.
• Monte Carlo method for simulating infrared transmittance.
• Experimental measurements on a dynamic test platform.

Main Results:

• Simulated parameters (spore number, radius, porosity, density) significantly influence extinction performance.
• Transmittance can be controlled below a threshold by adjusting influencing factors.
• Monte Carlo simulations accurately reflect IR light attenuation in spore agglomerates.

Conclusions:

• The study provides insights into controlling infrared light attenuation by fungal spore aerosols.
• Simulation methods effectively predict light extinction in aggregated microbial materials.
• Findings support applications requiring specific attenuation levels for fungal spore swarms.