# Study of Sea Fog Environment Polarization Transmission Characteristics
## 5 Experimental Results and Analysis  
(1) Salt content effect on polarization degree  
The existence of sufficient condensation nodules is crucial to the production of marine fog. There are no contaminants or dust particles that can serve as condensation nodules. Even if it approaches saturation, condensation will not occur. Even when air is oversaturated eightfold (i.e., 800 percent relative humidity), only a small quantity of water condenses. In maritime environments, the condensation core is mostly composed of sea salt particles. In order to examine the effect of salt content on polarized light transmission in sea fog, three types of salt fog with varying salt contents were chosen and compared to pure water fog (0 g/L salt content). The relative NaCl concentrations were 10 g/L, 20 g/L, and 30 g/L [18]. The polarization change curve at the same wavelength was drawn but with varying salt concentrations and optical thicknesses. Figures 5-7 illustrate the relationship between the salt concentration in fog and the degree of polarization in relation to the change in optical thickness when the polarization state of three incoming wavelengths (450 nm, 532 nm, and 671 nm) is left-handed. Figures 5-7 demonstrate that the degree of polarization decreases as the optical thickness of the four concentrations of sea fog increases. The results indicate that in the visible light range, the salt content in the fog has an effect on the polarization transmission characteristics as the optical thickness increases, and when the optical thickness remains constant, the polarization degree of the three salt fog concentrations is greater than that of the water fog. The cause is examined. The condensation nodules (salt particles) in sea fog affect the production of sea fog droplets when the fog filling time is constant. The salt in the sea fog may increase the development of fog droplets, alter their radius and quantity, and alter absorption and scattering as a result. Upon comparing the simulation results curve to the experimental results curve, it is discovered that there is an inaccuracy. The reason for this is that the sea fog environment in the experiment was not completely static  
Figure 4: A physical representation of the polarization transmission characteristic test setup. throughout the steady period and was only somewhat uniform during this time. Because the general decreasing trend is consistent with the modeling results, the experimental error is acceptable within the fault tolerance range. (2) The impact of the polarization condition of incident light on the polarization degree  
In this part, the 30 g/L salt content data group is discussed, and modeling and experimental findings are assessed based on the starting polarization state and incoming light wavelength. Figures 8-10 depict the comparison of simulation and experimental results of the change in polarization degree with the increase in optical thickness during the transmission of polarized light at three incident wavelengths (450 nm, 532 nm, and 671 nm) in sea fog particles, with Figure (a) representing the simulation results and Figure (b) representing the experimental results. Figure 5: Simulation and experimental comparison of the relationship between salt content at 450 nm and DOP: (**a**) simulation results and (**b**) experimental results. Figure 6: Simulation and experimental comparison of the relationship between salt content at 532 nm and DOP: (**a**) simulation results and (**b**) experimental results. Figure 8 demonstrates that when optical thickness increases, the degree of polarization of incoming light in five distinct polarization states decreases. In the simulation results of the three bands, the polarization state curves of 0\({}^{\circ}\), 45\({}^{\circ}\), and 90\({}^{\circ}\) incident light are completely coincident, as are the left-hand and right-hand curves. However, in the experimental results, the existence of the three curves is not precisely the same, especially as the optical thickness increases.