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Integrated Thin-Film Smart Coatings with Dynamically-Tunable Thermo-Optical Characteristics
Technical Paper
2002-01-2549
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents experimental results regarding a new approach to smart radiator devices (SRD) employing a smart, integrated thin-film structure based on V1-x-yMxNyOn that can be applied to existing thermal blankets such as Kapton or to thermal radiators such as Al. The smart coating facilitates thermal control by dynamically modifying the thermo-optic characteristics of the underlying substrate in response to the ambient temperature and/or a control voltage. This methodology has significant advantages over competitive technologies in terms of weight, cost, structural simplicity, and integration with the space structure. The effective emissivity of the film/substrate structure can be reduced dynamically by changing the behavior of the smart coating from insulator to metallic. High quality VO2 films have been prepared using a hybrid reactive laser ablation technique. These films can exhibit high transmittance in the insulating state, exceeding 75% from the NIR to beyond 12 μm, and correspondingly high reflectance in the metallic state. Additional dopants, M and N, are employed to tailor the metal-insulator transition characteristics, providing control of the transition temperature, slope and hysteresis.
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Kruzelecky, R., Haddad, E., Soltani, M., Chaker, M. et al., "Integrated Thin-Film Smart Coatings with Dynamically-Tunable Thermo-Optical Characteristics," SAE Technical Paper 2002-01-2549, 2002, https://doi.org/10.4271/2002-01-2549.Also In
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