Multi-field polarization lidar detection system and method for detecting ice cloud

Abstract

The invention discloses a multi-field polarization lidar detection system and a method for detecting an ice cloud, wherein the multi-field polarization lidar detection system comprises a transmittingmodule, a receiving module and a main control module. The transmitting module comprises a laser, a beam expander and a first reflector. The receiving module comprises a telescope, a second reflector,an electric aperture, a convex lens, an optical filter, a polarizer, an attenuator, a polarization beam splitter, a first to second photodetectors and a signal acquisition module; the laser, the electric aperture and the signal acquisition module are respectively connected with the main control module; and the first photodetector and the second photodetector are respectively connected with the signal acquisition module. The detection method utilizes a laser to generate laser radiation of a wavelength of 532 nm; parallel polarized light and vertical polarized light are respectively detected through two optical receiving passages of a parallel detection passage and a vertical detection passage; a depolarization ratio is calculated through the two detection passages; and the depolarization ratio and a T-Matrix method are used for calculating the content of ice water and effective particle radius of cloud particles.

Description

Technical field [0001] The invention relates to a multi-field polarization laser radar detection system and a method for detecting ice clouds, in particular to a method for measuring and inverting the microphysical characteristics of ice cloud particles by changing the field of view angle, and belongs to the technical field of cloud particle detection. Background technique [0002] Clouds are an important part of the earth’s climate system. 60% to 70% of the earth’s surface is covered by clouds. For the study of weather systems and climate change, the physical properties of clouds are one of the important considerations. The radiation effect of clouds significantly affects the balance of earth-atmosphere radiation budget. The existence of clouds not only reduces the solar radiation reaching the surface, but also prevents part of the surface long-wave radiation energy from dissipating, which has a direct impact on the atmospheric temperature. In addition, cloud simulation is one ...

AI Technical Summary

Problems solved by technology

However, the traditional laser radar can only measure the laser radar echo under a single field of view. According to the Mie scattering theory, the laser radar echo with a single field of view cannot reflect the scale spectrum information of cloud particles. Therefore, the multi-field laser radar It is of great significance to study the microphysical parameters of clouds

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