Quantifying the constraints of Kirchhoff's law for thermal emission from non-isothermal inhomogeneous materials, such as blackbody paint and anodized aluminum

Nathan Hagen

doi:10.1117/12.3026977

3 October 2024 Quantifying the constraints of Kirchhoff's law for thermal emission from non-isothermal inhomogeneous materials, such as blackbody paint and anodized aluminum

Nathan Hagen

Author Affiliations +

Proceedings Volume 13144, Infrared Remote Sensing and Instrumentation XXXII; 131440M (2024) https://doi.org/10.1117/12.3026977
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Some paints can create surprisingly good blackbody sources. Anodized aluminum is another coating that has a surprisingly high emissivity. We review the structure of these inhomogeneous materials and explore the theory explaining their emission properties. Using a model for volumetric emission from non-isothermal inhomogeneous media, we present a quantitative discussion of the conditions under which Kirchhoff’s law is valid. Using this model, we show how it is possible for many blackbody simulators and infrared camera shutters to produce such high emissivity, despite being constructed of only a thin layer of paint over a metal surface.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Nathan Hagen "Quantifying the constraints of Kirchhoff's law for thermal emission from non-isothermal inhomogeneous materials, such as blackbody paint and anodized aluminum", Proc. SPIE 13144, Infrared Remote Sensing and Instrumentation XXXII, 131440M (3 October 2024); https://doi.org/10.1117/12.3026977

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