Simulation Research on Sky Polarization Characteristics Under Complicated Marine Environment

Su, 张肃 Zhang; Juntong, 战俊彤 Zhan; Qiang, 付强 Fu; Huilin, 姜会林 Jiang

doi:10.3788/aos202040.2201001

Cited by 6 publications

(2 citation statements)

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“…Frontiers in Physics frontiersin.org unbiased sunlight will become polarized after additional scattering [17]. Therefore, the degree of polarization grows as eyesight declines, and this phenomenon becomes more noticeable as the viewing angle increases.…”

Section: Figure 13mentioning

confidence: 99%

Sky polarization pattern under multi-layer environment of atmosphere and sea fog

Liu²,

Liu³

et al. 2022

Front. Phys.

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The vertical polarization distribution pattern of sea fog multilayer media and skylight in the atmosphere is explored. To change the complicated maritime environment, the simplified double layer structure of the atmosphere and sea fog is employed, and the scattering coefficients of the uniform atmosphere and sea fog medium are derived using the Rayleigh and Mie scattering methods, respectively. Using the adding-doubling method (RT3) based on the vector radiation transmission equation, the transmission of radiation between the two layers of the medium is calculated to obtain the polarization distribution conditions of skylight, 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. An indoor sea fog setting was employed to perform the polarization transmission test, and the relationship between humidity, light intensity transmittance, and polarization degree was explored. The data suggest that the Sun’s position gives the lowest degree of polarization (DOP), and that the maximum value is obtained when the angle between the solar altitude angle and the observed altitude angle is 90°. Short wavelength lasers have a higher influence on optical transmittance than long wavelength lasers do when humidity levels increase. The circular polarization effect of long wavelength laser is better in damp surroundings.

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Section: Figure 13mentioning

confidence: 99%

Sky polarization pattern under multi-layer environment of atmosphere and sea fog

Liu²,

Liu³

et al. 2022

Front. Phys.

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“…By comprehensively utilizing acquired multi-dimensional information, it can greatly enhance the readability of the mage, thereby effectively improving the detection and identification capabilities of the target. However, in traditional infrared imaging systems, multi-band and polarization imaging detection technologies are limited by size, stability, and information processing capabilities, resulting in poor real-time performance, complex structures, low energy utilization efficiency, and varying degrees of information loss [4][5][6][7][8] . These limitations greatly restrict the application optoelectronic detection devices in various fields.…”

Section: Introductionmentioning

confidence: 99%

Mid-infrared dual-band imaging metalens

Xiao,

Weiwen,

Dapeng

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems

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Traditional mid-infrared optical devices are characterized by complex structures, large volumes, and high prices, which impede the advancement of future multidimensional, multifunctional, and miniaturized integration. However, metasurfaces comprising planar and ultra-thin nanostructures have emerged as a promising alternative. By manipulating the interaction between light and materials at subwavelength scales, metasurfaces exhibit remarkable control over optical fields and offer multifunctional capabilities. Consequently, they provide new avenues for integrating infrared systems in a miniaturized form. In this paper, an efficient metalens based on Pancharatnam-Berry (PB) phase working in the mid-infrared range(3.7μm-4.8μm) is proposed and numerically demonstrated. The proposed metalens enables precise control of incident light phase, thereby converge the incident light into two focal spots within spectral-band ranges: 3.7μm-4.0μm (with a focal length of 150μm) and 4.5μm-4.8μm (with a focal length of 250μm). The bifocal metalens is space division multiplexing designed using alternately arranged a-Si nanobricks, facilitating a high polarization conversion efficiency exceeding 80% and achieving achromatic behavior within the two spectral-band ranges. This work demonstrates the potential application of metalens for addressing complex tasks in infrared optical detection.

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A dehazing method for sea fog images based on pixel-level skylight polarization degree estimation

Li,

Geng,

et al. 2024

Journal of Modern Optics

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Simulation Research on Sky Polarization Characteristics Under Complicated Marine Environment

Cited by 6 publications

References 0 publications

Sky polarization pattern under multi-layer environment of atmosphere and sea fog

Sky polarization pattern under multi-layer environment of atmosphere and sea fog

Mid-infrared dual-band imaging metalens

A dehazing method for sea fog images based on pixel-level skylight polarization degree estimation

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