METHOD AND APPARATUS FOR OPTICAL MEASUREMENT OF DISTRIBUTION OF SIZE AND CONCENTRATION OF DISPERSED PARTICLES IN LIQUIDS AND GASES USING SINGLE-ELEMENT AND MATRIX LASER RADIATION PHOTODETECTORS Russian patent published in 2014 - IPC G01N15/02 G01N21/47 

FIELD: physics, optics.

SUBSTANCE: invention relates to optical diagnosis of physical media and can be used in devices designed to measure the distribution of concentration and size of micro- and nanoparticles in liquids and gases. The method includes measuring fluctuation of power of radiation scattered on investigated particles at relatively large angles, measuring the intensity distribution of the scattered radiation at small scattering angles and mathematically processing the obtained data by solving an integral equation of the inverse scattering problem. The apparatus includes a probing laser, a working cuvette with the investigated medium, single-element photodetectors placed in the scattering plane of the laser beam and arranged at relatively large angles to detect fluctuation of the power of radiation scattered on the particles, a matrix photodetector for detecting small-angle pattern of the scattered radiation and a lens which collects the light beam transmitted through the working cuvette, said matrix photodetector lying in the focal plane of said lens.

EFFECT: invention provides high measurement accuracy.

2 cl, 2 dwg