ABSTRACT
Taking the squash method to measure the reflection spectra of BB0919 spores in the range of 2.5~15 μm, and the complex refractive index of biological material in the range of 8~14 μm was calculated based on the Kramers-Kroning (K-K) relation. Then, we simulated five biological aggregated particles with the same original particle number and different porosity by a cluster-cluster model, the discrete dipole approximation was used to calculate the extinction characteristics of the aggregated particles with different spatial structures in the far infrared band. The results indicated that the larger the porosity of the aggregated particles, the better the extinction performance in the far infrared band. When the value of the original particle number, particle radius, and mass density is 50, 1.5 μm, 1120 kg/m3 respectively, the mass extinction coefficient of the aggregated particles with the porosity of 0.9033 takes a maximum of 2.262 m2/g and a minimum of 1.041 m2/g in the far infrared band.
