Mr. Junchao Li Profile

Junchao Li

at Communication Univ of China

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Proceedings Article | 24 November 2021 Paper

Study on attenuation of laser intensity by atmospheric haze particles

Ye Wang, JunChao Li

Proceedings Volume 12064, 120640S (2021) https://doi.org/10.1117/12.2607023

KEYWORDS: Air contamination, Particles, Light scattering, Atmospheric particles, Polarization, Mie scattering, Scattering, Laser scattering, Signal attenuation, Spherical lenses

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When the laser passes through the haze atmosphere, the laser interacts with the haze particles and scatters. The scattered light will take away the energy of the laser beam. At the same time, the scattered light maps the physical characteristics of the haze particles, such as the particle size parameters of the haze particles. Polarization information such as shape model, scale distribution, etc. Comprehensive analysis of the light intensity information, polarization information and spectral information of the scattered light and the main beam can not only draw the light scattering law of the haze particles, but also reflect the physical characteristics of the haze particles, so as to better improve the optics. The accuracy of the system's inspection of haze particles, so the use of light beams to study the relevant parameters of haze particles is becoming more and more important. This article first analyzes the physical parameters of the haze particles, and elaborates on the scattering theory of the laser beam by the haze example. In the artificially simulated haze environment, by changing the haze concentration and measuring distance, the attenuation change of the light intensity is measured. According to the Mie scattering theoryi, the direct-view and non-direct-view single-scattering models of haze spherical particles analyze the corresponding parameter relationships.

Proceedings Article | 5 November 2020 Paper

Design on indoor light environment for a shadowless space

Ye Wang, Junchao Li

Proceedings Volume 11567, 115674K (2020) https://doi.org/10.1117/12.2581141

KEYWORDS: Light sources, Integrating spheres, Light, Lamps, Spherical lenses, Optical spheres, 3D modeling, Light sources and illumination, Reflection

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With the development of specific light environment design, people are no longer satisfied with the simple lighting needs of the light source in the traditional sense, and begin to pursue ideal vision in complex light environments. The creation of shadowless spaces has been widely used in various fields, such as medical treatment, photography, dynamic capture, etc. While enjoying the convenience brought by the shadowless space, people are also exploring the most optimized shadowless space design. This article proposes two design methods to achieve shadowless space. One is based on the design concept of traditional shadowless lamps. Light is evenly irradiated to the target object from different directions. By setting the number and position of the light source in the space, shadowless areas are produced within. The second is based on the semi-light principle in the integrating sphere to realize the shadowless space. The reflectivity of the inner surface of the spherical cavity is extremely high. The light emitted by the light source is reflected by the spherical cavity multiple times, and finally evolved into uniform illumination in the space. Diffuse reflection reaches the shadowless space. Based on these two ideas, we proposed two optical design systems and simulated these two systems with Tracepro.

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