Identification of aerosol particle properties based on optical polarization measurement

With the development of industrialization, the problem of aerosol pollution has become increasingly prominent, which has a significant impact on public health. In this paper, the variation of Stokes vector of scattered light of aerosol particles under 45° incident polarized light is analyzed by T-matrix method, and the effects of complex refractive index, shape and particle size on Stokes vector are discussed. The results show that the variation trend and numerical difference of normalized S1, S2 and S3 can realize the morphological recognition of spherical and ellipsoidal particles. These parameters are sensitive to real and imaginary parts of different complex refractive indices in different detection ranges. This shows that the scattering Stokes vector obtained by 45° linearly polarized light shows great potential in identifying the morphology, complex refractive index and particle size of aerosol particles, and provides a new method and idea for the accurate identification of aerosol particle properties.