Study on Light Scattering Characteristics of Smog Particles

• Main Authors: Jian-Yu Shen, 沈劍瑀
• Other Authors: Tsung-Xian Lee
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/trjry5

碩士 === 國立臺灣科技大學 === 色彩與照明科技研究所 === 106 === Under the development of the most new technologies, the importance of environmental protection is often overlooked. Nowadays, natural disasters continue to occur, like the smog has become the most common air pollution in Asia. The smog, sometimes, is produced by mixing the unfiltered exhaust gas from factories, automobiles, power plants, etc., with mist in the air. If these exhaust gas contains toxic components, it will affect human health. However, the threat of smog is not only limited to human health, but also has a major impact on visual sensation. According to the Mie scattering theory, we know that the extinction characteristics of particles can affect the performance of light scattering and absorption. Therefore, when the smog particles is dispersed in the atmospheric, the light distribution pattern, spectrum and luminous flux of outdoor lighting may be changed. In this paper, we uses data collection, experimental measurement and Monte Carlo ray tracing based on Mie theory to establish a optical model of mist and solid suspended particles. Further, we explore the light through different concentration and particle size of the smog environment, resulting in changes in the light distribution pattern, spectrum and luminous flux. We also simulate the mixture of mist particles and solid suspended particles, and explore the compliance of the headlights and streetlights optical system, whether the changes caused in the smog environment can still comply with the regulations. Research indicates that the existing outdoor lighting, under the condition of mist environment, when the particle size is around 5 μm, there is strong extinction property, and it is mainly affected by light scattering, not absorption; when the environment has only solid suspended particles, the effect on the optical properties of light is less significant, mainly because the concentration that poses a threat to human health is not sufficient to affect light transmission for air quality monitoring.