Research On Scattering Spectral Characteristics Based On The Core-shellstructure Of The Discrete Dipole Approximation Model

The measurement technology of core-shell structure particles has been developed rapidly in recent years and it has become a popular topic in many areas.This thesis used the discrete dipole approximation method(DDA) and Mie scattering theory analytical method, to research the scattering properties of water mist package core-shell structure formed by the other particles of particles. To target on single and multiple particle core-shell structure particles whose sphere diameter is 1μm as well as elliptical core-shell structure particles with different major-minor axis ration.This will be performed simulation tests in terms of extinction, scattering, absorption coefficient and scattering intensity respectively results will be analysed. For meeting single scattering of the condition, based on Lambert Beer’s law, theoretical analyzed the changes of transmittance of laser which wavelength of 532 nm, 650 nm, 980 nm and 1064 nm transported in the core-shell structure particles. Established experimental device for measuring the scattering properties of core-shell particle layer, irradiated the core-shell structure particles with laser of 532 nm, 650 nm and 980 nm wavelength for measuring forward, backward scattered light intensity and transmittance curves. By utilizing metallographic microscope, the structure of corresponding core-shell structure particles will be marked. This will improvement of measurement accuracy of core-shell structure particles and provides valuable data for solving the influence of near-field core-shell structure particle layers to communication.