Improving the accuracy of laser particle sizer with Mie scattering theory

Using the classical Mie scattering theory and Fraunhofer diffraction theory,adetailed analysis of the differences of the light energy distribution falling on the multi-elementconcentric photo-detector of a diffraction based laser particle sizer is given.Numerical calcula-tions and computer simulation are carried out. Experimental studies are also made with latexspheres as Standard Reference Material.Our research shows that when the classical Mie scat-tering theory is used,the accuracy of the particle sizer can be essentially improved not only inthe small size range,but also for large paticles.At the same time the time needed for data re-duction in both cases is almost the same.

Improving the accuracy of laser particle sizer with Mie scattering theory

Using the classical Mie scattering theory and Fraunhofer diffraction theory, a detailed analysis of the differences of the light energy distribution falling on the multi-element concentric photo-detector of a diffraction based laser particle sizer is given. Numerical calculations and computer simulation are carried out. Experimental studies are also made with iatex spheres as Standard Reference Material. Our research shows that when the classical Mie scattering theory is used, the accuracy of the particle sizer can be essentially improved not only in the small size range, but also for large paticles. At the same time the time needed for data reduction in both cases is almost the same.