METHOD OF MEASURING OPTICAL RADIATION ATTENUATION INDEX BY AEROSOL LAYER Russian patent published in 2024 - IPC G01W1/00 

FIELD: measuring.

SUBSTANCE: invention relates to meteorology and can be used to determine the attenuation index of optical radiation by an aerosol layer. Measuring system is formed from directional optical radiation source (DORS) (1) installed on one line between two identical photodetectors (2). At that, photodetectors of matrix type (MPD) are used, the planes of apertures of which lie in one plane perpendicular to the plane formed by the installation line of the measuring system and the radiation axis of the DORS. Second MPD is located at distance of 0.5R from DORS, where R is the distance between the first MPD and the directional optical radiation source. Locations of measurement points in the aerosol layer are limited by a semicircle line of radius R drawn from the point of installation of the DORS in the direction of the second MPD at a distance R. N measurement points for N thickness of the aerosol layer are selected on the semicircle line. N-th point of the n-th thickness of the aerosol layer is irradiated with radiation of the DORS. Image of the radiation beam of DORS scattered by the aerosol layer is formed by means of the MPD. Photosensitive elements of arrays of matrix photodetectors are determined on the obtained images, the locations of which characterize that the radiation axis of the DORS is the bisector of the angle at the n-th point of the n-th thickness of the aerosol layer formed by lines drawn from the centres of the input apertures of the MPD to the n-th point n-th thickness of the aerosol layer. Optical radiation attenuation by the n-th thickness aerosol layer is determined from the values of the output signals of the selected photosensitive elements of the MPD, the geometric parameters of their location and the geometric parameters of the measuring system relative to the n-th point of the n-th thickness of the aerosol layer. Optical radiation attenuation index of the aerosol layer between the n-th and n+1-th measurement points is determined through the difference in the optical radiation attenuation values of the aerosol layer for the n-th and n+1-th thicknesses.

EFFECT: high efficiency of measuring attenuation of optical radiation by an aerosol layer.

1 cl, 2 dwg