FIELD: analysis of materials. SUBSTANCE: coherent laser radiation is let through investigated medium containing particles and radiation emerged as a result of light scattering on particles at different angles is registered. Speckle pattern is formed in plane of radiation registration, average radiation intensity I(θ) in speckle pattern at different angles to direction of incident ray is found and average statistical size of particles is determined by formula specified in description of invention. EFFECT: enhanced authenticity of determination of sizes of particles. 1 dwg
