The propagation of optical radiation in optically dense or distant aerosol formations is accompanied by multiple scattering of light, which leads not only to attenuation of radiation, but also to its depolarization. In the case of polarized laser sounding of such media, a feature of the formed double-scattered radiation flux is the anisotropic distribution of polarization characteristics over the cross section of the beam at the focal plane of the lidar receiver. The results of numerical modeling of the lidar return from droplet aerosol formations in the double scattering approximation are reported. The focus is on analyzing the influence of the size of droplet particles on the ratio of polarization degrees of double scattering lidar return at focal plane of receiver when sounding radiation has a linear and circular polarization state.
The propagation of optical radiation in optically dense media is accompanied by multiple light scattering, which leads not only to the extinction, but also to its depolarization. The method of polarization laser sensing allows to increase the information content of lidar data. The results of numerical simulation of the distribution in the registration plane of the polarization characteristics of a lidar return due to double scattering from droplet clouds are presented in this paper. The influence of the parameters of the particle size distribution of the droplet cloud on the azimuthal intensity distribution of the lidar return with a change in the polarization state of the probe radiation is discussed.
The report deals with laser sensing of crystal clouds in the double scattering approximation. The focus is on analyzing the influence of the size of crystalline particles on the polarization characteristics of double scattering lidar return.
The work is devoted to polarization remote sensing of droplet clouds in the double-scattering approximation. A numerical simulation of the individual radiation fluxes forming the lidar return is carried out. The main attention is paid to the analysis of the influence of the aerosol formation microstructure on the polarization characteristics of a double scattered radiation.
The work is devoted to polarization remote sensing droplet and crystal clouds by coaxial lidar. The results of numerical modeling of the distribution of the ellipticity and the semi-major axis orientation of the ellipse of polarization of lidar returns in the double-scattering approximation are discussed.
Multiple-field-of-view (MFOV) lidar is an effective tool for sensing of optical dense aerosol formation. As is well known, the size and phase composition of cloud particles effect on characteristics of double scattering lidar signal. This work focuses on research of informativeness of multiple scattering lidar signal. The results of the numerical simulation of the ratio of polarization degrees (circular and linear) of double scattering lidar return from droplet clouds with different particles size distribution are presented in this paper.
In this paper the results of the study of the polarization characteristics of double scattering lidar return from drip clouds presents. We calculated the distribution of the intensity of the radiation scattered by cloud and detected by CCDcamera at sensing circularly and linearly polarized radiation. CCD-camera setting in the receiving system lidar.
The work is devoted to remote sensing droplet clouds by coaxial lidar. The results of numerical modeling of the distribution of polarization ellipse parameters of lidar returns in the double-scattering approximation are discussed. It is shown that the half-width of the particle size distribution has a greater influence on the ellipticity of the polarization ellipse rather than a modal radius.
Interpretation of lidar data most often carried out using the lidar equation, but it limited small optical depth. However the multiple scattering in the clouds and dense haze significant impact on value and the polarization state of lidar return. Results of the calculation of polarization characteristics of double scattering lidar return from marine and continental clouds with different liquid water content using circularly and linearly polarized sensing radiation and multiple field of view lidar are discussed in this paper.
The work is devoted to remote sensing droplet clouds by coaxial lidar. The results of numerical modeling of the distribution of polarization ellipse parameters of lidar returns in the double-scattering approximation are discussed. It is shown that the polarization state of sounding radiation transforms from a linear (or circular) to the elliptical at the study droplet clouds.
The paper presents the first results of observations of cirrus clouds by polarization lidars with conical scanning, which were developed in Hefei (China) and in Tomsk (Russia). The light scattering matrix of ice crystal particles of cirrus clouds has been calculated for the first by the authors within the framework of the physical optics approximations in the case of conical scanning lidar. It is found that in this case the Mueller matrix consists of ten non-zero elements, four of which are small and can’t be applied to interpret the azimuthal distribution of particle orientation. All the diagonal elements have a strong azimuthal dependence. Among the off-diagonal elements only one element M34 carries additional information for interpreting the azimuthal distribution.
The task of laser sensing of droplet clouds by coaxial lidar is considered. Lidar return due to single scattering is formed in the volume bounded by the radiation pattern of the transmitter, while the double-scattering is determined by a receiving system field of view. The volume of the scattering medium exceeding a receiving system field of view forms the signal higher scattering orders ( < 2). The results of the numerical modeling of the distribution (in the recording plane) polarization characteristics of lidar signal from droplet clouds in the double scattering approximation in comparison with the results of the physical model experiment simulating sounding of a droplet cloud are discussed in this paper.
The paper discusses the problem of numerical simulations of the lidar returns that account for contributions from single and
double scattering from dense aerosol formations. We have calculated the power and the polarization degree of the double
scattering lidar return from droplet and crystalline clouds at different distances and with different field of view of the lidar
receiver.
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