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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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VO₂-based active tunable emittance thermochromic flexible coatings.

N Numan, B Mabakachaba, A Simo

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|November 11, 2020

Summary

This study introduces vanadium dioxide (VO2)-based thin-film coatings on flexible aluminum substrates. These smart coatings demonstrate tunable emittance switching, ideal for radiation devices in spacecraft.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Traditional radiation devices lack dynamic control over thermal emission.
Flexible substrates offer advantages for deployable space structures.
Vanadium dioxide (VO2) is known for its phase transition properties affecting optical characteristics.

Purpose of the Study:

To develop and characterize VO2-based thin-film coatings on flexible substrates for tunable emittance.
To investigate the emittance-switching properties (Δε) of these novel coatings.
To assess the potential applications of these smart radiation devices in aerospace.

Main Methods:

Fabrication of a layered stack: amorphous silicon:hydrogen (a-Si:H)/silicon dioxide (SiO2)/VO2 on flexible aluminum sheets.
Measurement of spectral emissivity at varying temperatures (40°C to 83°C).
Calculation of emittance-switching (Δε) and relative variation (Δε/εΛ).

Main Results:

Achieved a tunable positive emittance-switching (Δε > 0) for the first time using VO2 on flexible Al.
Demonstrated minimum and maximum emissivity values of ~0.18 and ~0.57 at 40°C and 83°C, respectively.
Reported an emittance-switching of 0.39 and a relative variation of ~217%.

Conclusions:

The developed VO2-based flexible coatings exhibit significant tunable emittance-switching capabilities.
These coatings are promising for advanced smart radiation devices in small satellites and spacecraft.
The tunable emissivity offers enhanced thermal management solutions for space applications.