Investigation of particle size in the colloidal scattering medium by Laser Speckle technique

Abstract

In this paper, a highly coherent laser is dispersed from a colloidal form of milk solution,an arbitrary grainy image named as speckle image is formed in observation plane due to Brownian motion. The outcomes shows that the statistical distribution of the intensity. The fluctuating nature of laser speckle in fluid medium is recorded for different concentration of the sample. Time progression of this interference image brings the required information of scattering particles.The aim of this work is the assessment of particle size by laser diffraction method through the dynamic speckle pattern. This laser scattering method helps to describe the corresponding speckle size for different concentration through image processing technique.