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Published on: April 16, 2017
Thermal imaging through hot emissive windows
Ciril Samuel Prasad1,2, Henry O Everitt2,3, Gururaj V Naik4
1Applied Physics Graduate Program, Smalley-Curl Institute, Rice University, Houston, TX, USA.
Researchers developed a special coating for hot windows, enabling infrared cameras to see through them. This breakthrough overcomes thermal emission interference, improving thermal imaging contrast significantly.
Area of Science:
- Optics and Photonics
- Materials Science
- Thermal Imaging
Background:
- Infrared cameras cannot image through hot windows due to intense thermal emission.
- High temperatures obscure objects behind windows, limiting thermal imaging applications.
Purpose of the Study:
- To enable infrared imaging through hot windows.
- To overcome the challenge of thermal emission blinding cameras.
Main Methods:
- Coating a hot window with an asymmetrically emitting infrared metasurface.
- Engineering the metasurface's imaginary index of refraction.
- Utilizing nanoscale resonators for controlled absorption losses.
Main Results:
- The metasurface-coated window suppresses thermal emission towards the camera.
- The window remains sufficiently transparent for thermal imaging.
- Achieved double the thermal imaging contrast compared to a control window at 873 K.
Conclusions:
- Metasurface coatings offer a viable solution for thermal imaging through hot windows.
- Engineered optical properties can overcome limitations of thermal emission.
- This technology enhances the capabilities of infrared imaging systems.
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