A Method of Atmospheric Laser Remote Sensing Based on Polarization Modulation and Polarization LiDAR

Abstract

The invention discloses an atmosphere laser remote sensing method based on polarization modulation and polarization laser radar. According to the invention, by use of specially designed polarization modulation light signals as detection light, back scattering light of a to-be-detected target includes two paths of orthogonal polarization echo signals and respectively carries carriers and positive first-order sideband signals. Thus, a receiving end detects reflection echoes only by use of a detector. By measuring frequency and power of beat frequency electrical signals in the echo signals, real-time measurement can be performed on wind speed information and depolarization ratio information in the atmosphere simultaneously. The invention discloses a polarization laser radar. Compared with theprior art, by ingeniously designing detection of optical signals, it can be achieved that real-time accurate measurement can be performed on wind speed and depolarization effects of to-be-detected atmosphere; only one set of detectors can be required; and the system structure is quite simple and the achieving cost is quite low.

Description

technical field [0001] The invention relates to an air laser remote sensing method, in particular to an atmospheric laser remote sensing method based on polarization modulation. Background technique [0002] The atmosphere is the guarantee for the survival of human beings. Changes in the state of the atmospheric environment have a direct and important impact on human activities. Therefore, it is of great scientific and practical significance to detect and study the atmosphere. According to detection methods, atmospheric detection is divided into three types: visual detection, direct detection, and remote sensing. The so-called atmospheric remote sensing refers to the detection carried out without direct contact between the detection instrument and the measured atmosphere. Remote sensing detection releases the position dependence of the detection instrument and the limitation of the detection range, so that the instrument can simultaneously measure a large range of atmospher...

AI Technical Summary

Problems solved by technology

However, the above two types of polarization lidar systems are relatively complex. The first type of polarization lidar requires two sets of detection and information acquisition devices, which are expensive, and the fluctuation of the efficiency of different detectors will affect the measurement of the depolarization ratio. Adverse effects, the second type of polarization lidar requires an additional polarization rotation device, and because the measurement of backscattered light with different polarization states is completed in different time periods, real-time measurement in the true sense cannot be achieved

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