VO2-based thermochromic films with passive radiative properties for spacecraft thermal control

Xueyu Wu; Xiaolong Weng; Le Yuan; Lun Qi; Biao Wei; Jianguo Zhang

doi:10.1117/12.2602318

24 June 2021 VO₂-based thermochromic films with passive radiative properties for spacecraft thermal control

Xueyu Wu, Xiaolong Weng, Le Yuan, Lun Qi, Biao Wei, Jianguo Zhang

Proceedings Volume 11885, International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2021); 118850R (2021) https://doi.org/10.1117/12.2602318
Event: 2021 International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2021), 2021, Xi'an, China

Abstract

VO₂ film is expected to be used in smart radiation devices (SRD) due to changes in infrared reflection caused by semiconductor-to-metal transition (SMT). In this work, a tunable thermal emitter which consisted of Al layer, CaF₂ layer and VO₂ layer was designed to achieve variable emittance with temperature. The variation of dielectric parameters of VO₂ shell caused by temperature change was used to regulate the absorption characteristics of the structure, to realize the positive emittance-switching performance of the thermal emitter device. It was found that the total emittance of the device could reversibly change from 0.03 at 30℃ to 0.72 at 90℃ with an emittance variability of 0.69 in 4-14 µm. In addition, the influence of the thickness of CaF₂, VO₂ layers and the intermediate layer material on the emittance variation of the device was studied. These results shown that the device has the best VO₂ and CaF₂ layer thicknesses of 20nm and 1000nm, respectively. Particularly, too high refractive index of the intermediate layer material will cause the device to produce multiple resonance peaks at high temperature, which will reduce the average emissivity of the entire band, resulting in a smaller change in the emissivity of the thermal emitter.

Citation Download Citation

Xueyu Wu, Xiaolong Weng, Le Yuan, Lun Qi, Biao Wei, and Jianguo Zhang "VO₂-based thermochromic films with passive radiative properties for spacecraft thermal control", Proc. SPIE 11885, International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2021), 118850R (24 June 2021); https://doi.org/10.1117/12.2602318

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available