Examination based on computational electromagnetics about the effect of particle deformation to non-spherical shape on the optical particle measurements

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Examination about the effect of particle deformation from a true sphere to an ellipsoid on the optical particle measurement technique was carried out based on the method of computational electromagnetics. In case of the phase-Doppler technique, relation between the posture of an ellipsoidal transparent droplet and the measurement error and the optimal position of sensor for suppressing measurement error was examined. In case of Fraunhofer diffraction method, imaginary size dispersion which appears even if the particles are mono-disperse resembles log-normal distribution. And, it was revealed that so-called optical equivalent diameter is near to the diameter corresponding to averaged area of orthogonal projection. Furthermore, problems in relation to multiple scattering were examined using the merit of computational electromagnetics.