Emissivity modulating electro-chromic device

Hulya Demiryont; Kenneth Shannon III; Andrew Williams

doi:10.1117/12.778249

17 March 2008 Emissivity modulating electro-chromic device

Hulya Demiryont, Kenneth Shannon III, Andrew Williams

Proceedings Volume 6939, Thermosense XXX; 69390N (2008) https://doi.org/10.1117/12.778249
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

The Eclipse infrared electro-chromic device (IR-ECD) is an all-solid-state monolithic vacuum deposited thin film system functioning as an electrically controlled dimmable mirror in the IR region. The maximum reflectance corresponding to the bleached condition of the system is around 90% (low-e condition, e=0.1). The minimum reflectance reaches nearly zero in the colored condition of the system (high emmittance, e=1). It is a variable emittance electro-chromic device (VE-ECD). The average emissivity modulation of the Eclipse VE-ECD is 0.7 in the 8-12 micron region, and at 9.7 micron (room temperature) it reaches a value of 0.9. Half and full emissivity modulations occur within 2 and 10 minutes, respectively. Because of its low mass (5 g/m²), low voltage requirement (±1 V), extremely good emissivity control properties (from 0 to 0.9 at 300 K), and highly repeatable deposition process, the VE-ECD technology is very attractive for satellite thermal control applications. The Eclipse VE-ECD has been under evaluation in a real space environment since March 8, 2007. This paper presents recent developments on Eclipse's VE-ECD including space test results.

Citation Download Citation

Hulya Demiryont, Kenneth Shannon III, and Andrew Williams "Emissivity modulating electro-chromic device", Proc. SPIE 6939, Thermosense XXX, 69390N (17 March 2008); https://doi.org/10.1117/12.778249

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