Abstract
Abstract. Polarization is one of the four basic physical properties of solar radiation. After the solar radiation reaches the surface of these media, it reflects, scatters or refracts, and exhibits different degrees of polarization. We use Rayleigh scattering model to get the simulation results of the sky polarization field. We use polarized fisheye camera to collect the sky polarization image, and calculate the distribution pattern of DOLP (degree of linear polarization) and AOLP (azimuth of linear polarization) of the skylight. The stability and gradual change of the degree of polarization in the zenith direction are verified, and the distribution law and daily change law of the degree of polarization in the sky are obtained. With the increase of the solar altitude angle, the degree of polarization will decrease. We also observed the skylight polarization in different weather conditions.
Highlights
The atmosphere is an important environment element for human beings, and it is an indispensable natural resource
T he actual distribution of sky polarization mode in cloudy weather is simulated, and the simulation results are consistent with the test results (Pust, Shaw, 2012)
Stokes vector S = [S1, S2, S3, S4 ]T can be expressed as another form S = [I, Q,U,V ]T, where I is the total intensity of light, Q and U are linearly polarized light in two orthogonal directions, and V is circularly polarized light
Summary
The atmosphere is an important environment element for human beings, and it is an indispensable natural resource. When the solar radiation passes through the atmosphere, it is scattered by the atmospheric particles, which will cause the polarization of light. Due to the scattering absorption of incident sunlight by air molecules and aerosol particles, the sky has a relatively stable polarization mode at some point in the day and at a certain position, which is the sky polarization field (Smith, 2007; Yan et al, 2020). G. Horváth et al proved that the skylight polarization field under cloud, fog and dust weather is similar to that in sunny weather (Pust, Shaw, 2012; Suhai, Horváth, 2004). T he actual distribution of sky polarization mode in cloudy weather is simulated, and the simulation results are consistent with the test results (Pust, Shaw, 2012). With the continuous development of polarization instruments, polarization measurement is playing an increasingly important role in many fields (Pomozi et al, 2001; Pust et al, 2011; Chu et al, 2017)
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