Polarization Pattern of Skylight in Multi-layer Environment of Atmosphere and Sea Fog

doi:10.12382/bgxb.2021.0143

Abstract

Abstract: The polarization distribution pattern of skylight in the atmosphere and sea fog multilayer medium in the vertical direction is researched.The simplified double layer structure of atmosphere and sea fog is applied to modulate the complicated marine environment，and the scattering coefficients of atmosphere and sea fog uniform medium are calculated with Rayleigh and Mie scattering methods，respectively.The transmission of radiation between the two layers of medium is computed to get the polarization distribution conditions of skylight by using the adding-doubling method（RT3） based on vector radiation transmission equation，and the variation tendency of the polarization characteristics observed from the ground is studied for the downwelling radiation of sea fog on the meridian of the sun.The results show that the minimum degree of polarization (DOP) can be obtained on the position of the sun. And when the angle between the solar altitude angle and the observed altitude angle is 90°，the maximum DOP can be obtained. With the decrease in the visibility，DOP gradually increases. When the observing altitude angle is larger than 90°，the increasing effect of DOP is obvious. For the typically visible wavelengths，DOP gradually reduces when the wavelength increases. The wavelength has less effect on the DOP with the smaller visibility.The research gives the theoretical guidance for polarization detection in the vertical sea fog environment with different visible wavelengths and different visibilities.

Key words: atmosphereandseafogmulti-layerenvironment, skylightpolarizationpattern, adding-doublingmethod, downwellingradiation

CLC Number:

O436.2

LIU Yang， FU Qiang， ZHANG Su， ZHAN Juntong， SHI Haodong， LI Yingchao， LIU Yi， LOU Yan， YU Yixin. Polarization Pattern of Skylight in Multi-layer Environment of Atmosphere and Sea Fog[J]. Acta Armamentarii, 2022, 43(5): 1201-1207.

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