Emissivity modulating electrochromic device

Hulya Demiryont; Kenneth C. Shannon III; Judd Sheets

doi:10.1117/12.818649

8 May 2009 Emissivity modulating electrochromic device

Hulya Demiryont, Kenneth C. Shannon III, Judd Sheets

Proceedings Volume 7331, Space Exploration Technologies II; 73310I (2009) https://doi.org/10.1117/12.818649
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The IR-ECD^TM (Infra-Red ElectroChromic Device) variable emitance device (VED) is an all-solid-state monolithic vacuum deposited thin film system with a unique metamaterial IR transparent-electrode system which functions 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 emittance, e=1). The average emissivity modulation of the IRECD^TM 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 and10 minutes respectively. Because of its light weight (5g/m²), low voltage requirement (+/- 1 Volts), extremely good emissivity control properties (from 0 to 0.9 at 300K) and highly repeatable deposition process, the IR-ECD^TM technology is very attractive for satellite thermal control applications. The IR-ECD^TM has been under evaluation in a real space environment since March 8, 2007. This paper presents recent achievements of the IR-ECD^TM including space test results.

Citation Download Citation

Hulya Demiryont, Kenneth C. Shannon III, and Judd Sheets "Emissivity modulating electrochromic device", Proc. SPIE 7331, Space Exploration Technologies II, 73310I (8 May 2009); https://doi.org/10.1117/12.818649

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