Study On the Laser Scattering characteristic of a Dielectric Particle with high Speed

The magnetic field of spherical particle is deduced under plane wave incidence according to the Mie scattering theory in this paper. Built coordinate systems, one coordinate system relatively moves along y- axle from another static coordinate system. The spherical particle lies in the moving coordinate system. The coordinates and vectors´ transformation are presented to establish a theoretic basis for studying the laser scattering of a particle because of moving effect. The scattering amplitude function and differential scattered section of moving spherical particle are given by the electric and magnetic field from Mie scattering theory. We obtain the differential scattered section of a spherical particle with arbitrary velocity. Under 1.06 mum laser wavelength, we compute the differential ratio between the laser differential scattered section (DSS) of moving dielectric spherical particle and that of the static medium spherical particle change with their dimensions and speeds. The numerical results show that the laser DSS of moving spherical particle is smaller than that of static spherical particle, the speed of the moving particle is higher, the laser DSS of the moving particle is smaller, the refractive index of particle is a marked factor to impact the laser DSS of moving medium spherical particle.