METHOD FOR LASER PROBING OF CIRRUS CLOUDS Russian patent published in 2023 - IPC G01S17/95 

FIELD: meteorology.

SUBSTANCE: linearly polarized laser pulsed radiation is sent into the atmosphere. Signals backscattered by the atmosphere are received in two mutually orthogonal polarization planes, one of which coincides with the plane of polarization of the probing laser radiation. The amplitude ratio of the received signals, which determines the degree of depolarization of the lidar signal with linear polarization, is calculated. Linearly polarized laser radiation is converted into circularly polarized radiation and sent into the atmosphere. The signals backscattered by the atmosphere are received. The degree of depolarization of the circularly polarized lidar signal is calculated. Then the ratio of the values of the degree of depolarization when probing with circular and linear polarization is calculated. When this ratio becomes less than two, the presence of atmospheric objects with a predominant orientation of crystalline particles is determined.

EFFECT: detection of areas with predominant or chaotic orientation of crystalline ice particles in clouds.

1 cl, 1 dwg