Abstract
Since the atmosphere has a strong scattering effect on ultraviolet light, the transmission of non-line-of-sight (NLOS) signals can be realized in the atmosphere. In previous articles, ultraviolet (UV) light atmospheric scattering has been characterized by many scattering models based on spot light sources with uniformly distributed light intensity. In order to explore the role of light sources in atmospheric transmission, this work proposed a UV light atmospheric transport model under different types of light source, including light-emitting diode (LED), laser, and ordinary light sources, based on the Monte Carlo point probability method. The simulation of the light source in the proposed model is a departure from the use of a light source with uniform intensity distribution in previous articles. The atmospheric transmission efficiency of different light sources was calculated and compared with the data of existing models. The simulation results showed that the type of light source can significantly change the shape of the received signal and the received energy density. The Monte Carlo (MC) point probability method dramatically reduced the calculation time and the number of photons. The transmission characteristics of different ultraviolet light sources in the atmosphere provide a theoretical foundation for the design of ultraviolet detection and near-ultraviolet signal communication in the future.
Highlights
Due to its strong scattering and absorption characteristics in the atmosphere and its low background noise, ultraviolet light has been widely used in short-range atmospheric non-line-of-sight optical communication [1,2,3], near-field wind-field detection [4], aircraft landing aid [5], atmospheric parameter measurement [6], and networking aspects [7] in recent years, in both to theoretical and experimental studies.The atmosphere is mainly composed of air molecules and aerosols
By changing the light intensity distribution of the light source and the geometric features of the transceiver (α, θT, θR, φT, φR ), we found that the light energy density of different light sources affected the received signal under the single-scattering mode
As for the ultraviolet light at direction wavelength the propagation position can−1be expressed as sxn, s yn, szn, and the acceptance probability k sr = 0.24km and the absorption coefficient can be set as ka = 0.74km−1 [36]. is Preci
Summary
Due to its strong scattering and absorption characteristics in the atmosphere and its low background noise, ultraviolet light has been widely used in short-range atmospheric non-line-of-sight optical communication [1,2,3], near-field wind-field detection [4], aircraft landing aid [5], atmospheric parameter measurement [6], and networking aspects [7] in recent years, in both to theoretical and experimental studies. Studies on UV none-line-of- sight (NLOS) communication mainly deal with UV devices, channel models, physical layer issues, and networking [3,15] All these areas, without exception, relate to the transmission of ultraviolet light in atmosphere, which is mainly characterized by the shape of the received signal and the received energy density. UV LEDs and avalanche photodiodes were used, respectively, for NLOS UV communication in References [26,27] It was shown in Reference [28] that a square matrix receiver was proposed to study the spatial diversity in a new way. These experiments applied empirical methods and the numerical simulation of light sources needs to be further explored.
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