DEVICE FOR MEASURING THE SPECTRUM OF DIMENSIONS OF AEROSOL PARTICLES AND METHOD OF MEASURING THE SPECTRUM OF DIMENSIONS OF AEROSOL PARTICLES Russian patent published in 2019 - IPC G01N15/02 

FIELD: metrology.

SUBSTANCE: invention relates to the study of the dispersed characteristics of aerosols of different nature and can be used in meteorology, in nanoproduction, to control nano-safety at workplaces, to determine the inhalation dose when using aerosol forms of drug delivery. Claimed device for measuring the spectrum of the size of aerosol particles, which includes a diffusion battery consisting of a series of consecutive sections filled with grids consisting of, for example, from metal or polymer fibers, on which aerosol particles are deposited during the passage of an aerosol stream through a battery, a condensation enlarger of particles, an optical particle counter and a personal computer for controlling the device as a whole, accumulating and processing the obtained data. According to the invention, the number of installed grids in each section of the diffusion battery, except for the first one, is equal to the total number of grids in all previous sections located upstream, which allows calculating the average particle diameter deposited in each section of the battery as described in the mathematical formula. Method of measuring the size spectrum of aerosol particles is implemented by sequentially passing an aerosol stream through the sections of a diffusion battery filled with nets, then through a condensation enlarger of particles, measurement of aerosol concentration by an optical counter and computer data processing. According to the method, using the measured probabilities of particles passing through the battery sections, the average deposition efficiency on the individual fibers of the mesh for the fractions of particles, that is, for particles deposited in the diffusion battery sections, is determined by the formula given in the description. Next, from the magnitude of the deposition efficiency, the average particle diameter of each fraction is determined by the formulas of the fan model of Kirsch-Stechkin-Fuchs filters, the spectrum of particles of each fraction is approximated by any function of monomodal distribution, including the log-normal distribution, Gaussian distribution, then the spectrum of the original aerosol is defined as the sum of the spectra of the fractions.

EFFECT: technical result is to simplify the process of measuring the spectrum of the size of aerosol particles and increase accuracy.

2 cl, 3 dwg, 1 tbl