Average particle size analyzer

Dandong Particle Size Analyzer FactoryThe particle size analyzer developed by the manufacturer, when in the laboratoryWhen light shines on particles, scattering and diffraction occur, and the intensity of the diffracted and scattered light is related to the size of the particles. Observing its light intensity, the particle size distribution can be obtained using Fraunhofer diffraction theory and Mie scattering theory (laser diffraction/scattering method), and calculated using Mie scattering theory. When light is incident on spherical particles, three types of light can be generated: the first type is reflected light on the surface of the particle, through the interior of the particle, and through the interior surface of the particle; The second type is light refracted through the interior of particles; The third type is diffraction light on the surface. These phenomena are independent of particle size and can all be treated as light scattering.

When the particle size is larger than the wavelength, the diffraction intensity obtained by Fraunhofer diffraction theory andThe theoretically obtained scattered light intensity is generally consistent. Therefore, Fraunhofer diffraction theory can be approximated as Mie scattering theory. At this point, the direction of light scattering (diffraction) is almost concentrated in the front, and its intensity varies greatly depending on the size of the particles. It represents the inherent light intensity spectrum of the particle size, and by solving for the light intensity distribution (scattering spectrum) of the particle, the particle size can be determined. When the wavelength and particle size are very close, Fraunhofer's approximation cannot be used to represent the scattering intensity. It is necessary to further discuss based on Mie scattering theory at this point. The scattered light intensity in Mie scattering is determined by the incident light wavelength, particle size, particle size, and the mediumTo confirm.