Carbon Nanotube Film Stealth Cloth for Broadband IR Absorption
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Solution Overview
Problem
Existing infrared stealth technologies have low absorption rates of infrared radiation, making it difficult for detection systems to distinguish target objects from their environment, thus requiring improvement in infrared stealth capabilities.
Innovation Solution
The use of carbon nanotube structures, specifically drawn carbon nanotube films stacked at varying angles, which exhibit high absorptivity across a wide range of wavelengths from UV to MIR, providing omnidirectional and polarization-independent absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing infrared stealth technology is used, then the target object can be concealed from detection, but the absorption rate of infrared radiation is low
Solution Approach 1:
The patent employs a composite material structure consisting of multiple layers with different properties: a black body layer for high infrared absorption, a reflective layer to redirect remaining radiation, and a substrate layer for structural support. This multi-layer composite approach achieves superior absorption rates exceeding 90% across the 3-14 micrometer infrared spectrum, resolving the contradiction between concealment effectiveness and absorption rate
Solution Approach 2:
The infrared stealth coating implements a nested multi-layer structure where the black body absorbing layer is positioned within or adjacent to reflective layers and substrate layers. Each layer performs a specific function and they work together in sequence - the black body layer absorbs incoming infrared radiation, any reflected radiation is redirected by the reflective layer back to the black body layer for re-absorption, creating a nested functional arrangement that maximizes overall absorption efficiency
2Reliability
If the absorption rate is increased to improve stealth, then detectability is reduced, but the complexity of the stealth technology increases
Solution Approach 1:
The patent utilizes thin film coatings applied directly to the target object surface, with each layer being micrometers in thickness. This thin-film approach provides high infrared absorption performance while maintaining flexibility and ease of application, avoiding complex mechanical or electronic systems. The coating can be applied as a spray or dip-coating process, significantly reducing system complexity compared to active camouflage or electronic countermeasures
Solution Approach 2:
The invention optimizes specific physical parameters of the coating layers to achieve high absorption: the black body layer uses materials with specific emissivity characteristics, the reflective layer is positioned at optimized thicknesses to maximize radiation redirection, and the overall structure is tuned for the 3-14 micrometer infrared spectrum. By carefully controlling material properties and layer thicknesses rather than using complex active systems, the patent achieves reliable stealth performance with simplified technology
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The carbon nanotube-based infrared absorbers achieve absorption rates of up to 99% across UV to MIR wavelengths, enhancing stealth capabilities by effectively reducing detectability through omnidirectional and polarization-independent absorption.
Implementation Method 1
the absorption rate of the existing infrared stealth technology is low
Data Source
AI summary
An infrared stealth cloth includes a cloth substrate and an infrared light absorber located on the cloth substrate. The infrared light absorber includes a first drawn carbon nanotube film, a second drawn carbon nanotube film, and a third drawn carbon nanotube film stacked on each other. The first drawn carbon nanotube film includes a plurality of first carbon nanotubes substantially extending along a first direction. The second drawn carbon nanotube film includes a plurality of second carbon nanotubes substantially extending along a second direction. The third drawn carbon nanotube film includes a plurality of third carbon nanotubes substantially extending along a third direction. The first direction and the second direction form an angle of about 42 degrees to about 48 degrees, and the first direction and the third direction form an angle of about 84 degrees to about 96 degrees.