Analysis on scattering and relationship with granular size in THz spectra

Scattering is an important phenomenon and distorts the THz absorption spectrum during analysis of materials. It is essential to understand how scattering from samples changes the THz signals. We presented an approach for estimating the relationship between scattering and granular sizes occurring in THz spectra. The samples were made of same solid material but in different granular sizes ranging from 58um to 150um. The experiment spectra indicated the absorption curves rose up with the granular size increasing, which met the simulation consequence based on Mie scattering. The empirical baseline models were presented in this paper, after removing the baseline, the result indicated that computational accuracy was improved, which can be used in quantitative analysis.