Abstract
Phase-Doppler anemometry (PDA) is a well-established optical measuring technique for the nonintrusive and simultaneous determination of size and velocity of spherical particles in various engineering processes. The design of a phase-Doppler system includes simulations based on the Mie theory, which describe the scattering of a plane wave by a spherical particle. Although the greater number of particles in technical processes or in the natural environment are non-spherical, the real shape is neglected and the particles are assumed to be perfectly spherical, with smooth surfaces, and to consist of homogeneous materials. In practice, it was found that the size-response of a phase-Doppler system deviates from the theoretical prediction when these assumptions are not fulfilled. In this paper, optical arrangements and adaptations of theories of light scattering will be discussed which utilize these deviations to provide even more information on the nature of the particles being examined.
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