FIELD: measurement technology. SUBSTANCE: invention refers to optical-interferential methods and devices to measure size and concentration of polydispersive aerosol media. Light stripes are formed in counting volume from probing coherent radiation by uninterrupted change of number of stripes, their width and spacing between stripes. Light diffused by aerosol particles is registered continuously and separately for each time moment corresponding to stripe structure of light in counting volume. Size and concentration of aerosol particles are evaluated by depth of modulation of signals of scattered radiation simultaneously received by each element of optical radiation detector from various stripe structures of light in counting volume. In this case signal does not depend on absolute value of scattering factor. Device measuring size and concentration of aerosol particles has laser, telescopic system, laser beam splitter, flat mirrors arranged at some angle with respect to radiation of laser, interference pattern observation plane, counting volume and optical radiation detector positioned in beam path. Specific feature of proposed device lies in insertion of cylindrical lens fitted with translation mechanism between mirrors. Counting volume is located in interference pattern observation plane. EFFECT: enhanced accuracy and widened range of sizes of measured particles, decreased effect of inhomogeneities on determination of size of aerosol particles, enlarged concentrations of aerosol particles. 2 cl, 1 dwg
