Mr. Zhiyi Liu Profile

Zhiyi Liu

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Proceedings Article | 4 December 2024 Paper

Research on emissivity of concave cavity array surface blackbody based on Monte Carlo ray tracing

Jingjing Zhou, Xiaopeng Hao, Guorui Guo, Jian Song, Zhiyi Liu, Xin Xu, Chunyuan Xu

Proceedings Volume 13283, 1328334 (2024) https://doi.org/10.1117/12.3037038

KEYWORDS: Emissivity, Black bodies, Monte Carlo methods, Reflection, Optical surfaces, Coating, Specular reflections, Infrared radiation, Ray tracing, Remote sensing

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As one of the commonly used blackbody types for infrared radiation calibration, the emissivity level of surface blackbody is limited by the surface coating and surface microstructure array. To study the emissivity of surface coatings and the influence of surface microstructure on the emissivity of surface blackbodies, we establish optical and mechanical models of four different array concave cavity surface blackbodies, including triangular concave cavity, quadrangular concave cavity, pentagonal concave cavity, and hexagonal concave cavity arrays. Based on the Monte Carlo ray tracing method, simulation calculations of blackbody emissivity are carried out, with a focus on analyzing the effects of array concave cavity structure type, optical properties of blackbody surface coatings, and height of concave cavity structure on the emissivity of surface source blackbodies. The simulation results show that, under the condition of 100% diffuse reflection coating on the surface and constant concave cavity edge length, for the four types of concave cavity arrays, an increase in coating emissivity or array height can promote the emissivity of the blackbody. When the length of the concave cavity remains constant and the surface emissivity remains constant, the higher the proportion of near specular reflection, the higher the normal emissivity. When the surface optical properties are the same and the array height is the same, for the four structures, the triangular concave cavity structure surface blackbody has a higher emissivity. The simulation results can provide theoretical basis and data support for the design of high emissivity surface blackbody for infrared radiation calibration.

Proceedings Article | 12 April 2023 Paper

Research on emissivity of surface blackbody with microarray structure based on Monte-Carlo method

Gang Wang, Caijuan Xia, Xiaopeng Hao, Jian Song, Jingjing Zhou, Rui Heng Sima, Zhi Yi Liu

Proceedings Volume 12565, 125653I (2023) https://doi.org/10.1117/12.2663126

KEYWORDS: Emissivity, Black bodies, Coating, Optical microcavities, Calibration, Reflection, Infrared sensors, Infrared radiation, Monte Carlo methods, Ray tracing

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The surface-source blackbody is widely used in infrared remote sensing and other fields as a calibration source to calibrate infrared loads by providing accurate infrared radiation, and the effective emissivity of the surface-source blackbody is one of the important parameters for the calibration of infrared devices, which directly determines the accuracy of calibration. In this paper, two microarray structure models, ideal and non-ideal cases, are established around the effective emissivity of the surface-source blackbody radiating surface, and simulation experiments based on Monte-Carlo method (MCM）are carried out. The effective emissivity of the blackbody radiation source is analyzed to be influenced by the geometrical parameters of the microcavity structure, the emissivity of the surface coating and different angles. The effective emissivity increases with the decrease of the base height ratio of the pyramidal microcavity structure, and the emissivity of the surface coating material is linearly increasing, and the linearity of the two models is better than 0.9997. The effective emissivity of the ideal and non-ideal models has a small trend in the vertical direction and horizon direction angle 0-±10°, and the standard deviation is less than 0.15%, which has high stability. The results of the study can provide theoretical guidance for the enhancement of the effective emissivity of the surface-source blackbody.

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