METHOD FOR HOLOGRAPHIC ANALYSIS OF SUSPENDED PARTICLES Russian patent published in 2015 - IPC G01N15/02 

FIELD: physics.

SUBSTANCE: present method includes illuminating a stream of particles with a beam of coherent radiation which is divided into a reference beam and an objective beam and recording a hologram of images of the particles from which the sizes of the particles are determined. After passing through the stream of particles, the objective light beam is turned perpendicular to the initial beam and then retransmitted through the stream of particles, wherein the turned objective beam is optically interfaced with the initial objective beam in a certain region of the stream and the interference pattern of the objective and reference beams is recorded by a CCD matrix in the turned beam. In that case, each particle is virtually illuminated with two perpendicular beams and its holographic image in each of the beams carries more complete and more accurate information on the projection of the particle on a plane perpendicular to the axis of the corresponding beam.

EFFECT: automation of the objective recording of the shape of particles and orientation thereof in space during movement of a dispersed stream in the entire range of sizes and shapes, high accuracy of measurements for irregularly shaped particles.

2 dwg