LAUSR

A novel particle sizing method based on diffraction glare points is proposed, which is independent of the refractive index of particle. With geometric optics approximation, the relationship between distance of diffraction glare points and particle size is obtained. In analysis of measurement parameters, we find that 4° is the optimal central scattering angle for measuring wide size range particles based on diffraction glare points. With an experimental system at this angle, diffraction glare points of four kinds of standard particles were imaged. The relative deviations between measured and nominal particle size were not greater than 2%, less than that using reflection glare points, demonstrating validity and advantage of the particle sizing method based on distance of diffraction glare points.