Effect of Greenhouse Gases on Thermal Emissivity by Clouds

Autor: van Wijngaarden, W. A., Happer, W.

Greenhouse gases, most importantly water vapor, increase the emissivity and decrease the albedo of clouds for thermal radiation. The modifications, which can be of order 10% for optically thick clouds, depend on the attenuation coefficient $\alpha^{\

Externí odkaz: http://arxiv.org/abs/2401.03061

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Broadband nonreciprocal thermal emissivity and absorptivity

Autor: Komron J. Shayegan, Jae S. Hwang, Bo Zhao, Aaswath P. Raman, Harry A. Atwater

Publikováno v: Light: Science & Applications, Vol 13, Iss 1, Pp 1-8 (2024)

Abstract A body that violates Kirchhoff’s law of thermal radiation exhibits an inequality in its spectral directional absorptivity and emissivity. Achieving such an inequality is of fundamental interest as well as a prerequisite for achieving therm

Externí odkaz: https://doaj.org/article/39c6a56fc22d4b70867d832fa909042b

Preliminary experiments on thermal emissivity adjustment for face images

Autor: Faundez-Zanuy, Marcos, Aragones, Xavier Font, Mekyska, Jiri

Publikováno v: in Esposito, A., Faundez-Zanuy, M., Morabito, F., Pasero, E. (eds) Progresses in Artificial Intelligence and Neural Systems. Smart Innovation, Systems and Technologies, vol 184. Springer, Singapore 2021

In this paper we summarize several applications based on thermal imaging. We emphasize the importance of emissivity adjustment for a proper temperature measurement. A new set of face images acquired at different emissivity values with steps of 0.01 i

Externí odkaz: http://arxiv.org/abs/2203.16107

Multi-functional Metasurface: Visibly and RF Transparent, NIR Control and Low Thermal Emissivity

Autor: Safari, Mahdi, Kherani, Nazir P., Eleftheriades, George V.

Rapid advances in metamaterial technology are enabling the engineering of wave-matter interactions heretofore not realized and functionalities with potentially far-reaching implications for major challenges in the fields of energy conservation and ra

Externí odkaz: http://arxiv.org/abs/2101.06238