Multi-spectral Selectively Reflective Construct for Camouflage
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Solution Overview
Problem
Conventional camouflage materials fail to effectively control reflectance, transmission, and absorption properties across the visible, near-infrared (nIR), mid-wave infrared (MWIR), and long-wave infrared (LWIR) bands of the electromagnetic spectrum, often resulting in increased detection in thermal bands when trying to maintain performance in visible and nIR bands.
Innovation Solution
A multi-spectral, selectively reflective construct comprising a thermally transparent, visually opaque substrate with a polymeric layer and colorant, combined with a thermally reflective layer of low emissivity, is positioned to control reflectance, transmission, and absorption properties across the specified EM bands, achieving specific reflection and transmission levels in the visible, nIR, MWIR, and LWIR ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional camouflage materials are used to achieve camouflage performance in visible and nIR bands, then camouflage performance in visible and nIR bands is improved, but detection in thermal bands (MWIR and LWIR) increases
Solution Approach 1:
The camouflage construct is divided into multiple functional layers, each optimized for specific EM bands: a first substrate layer for visible/nIR properties, a second substrate layer for thermal band properties, and an intervening layer for mechanical bonding. This segmentation allows independent optimization of each layer for its designated spectral range without compromising overall performance.
Solution Approach 2:
The invention uses composite material structures combining different substrates with distinct optical and thermal properties. The first substrate (e.g., PTFE with carbon black) provides visible/nIR camouflage, while the second substrate (e.g., polyethylene or fluorinated polymers) provides thermal band control. This composite approach enables simultaneous achievement of multi-spectral camouflage performance that single materials cannot provide.
2Object-affected harmful factors
If reflectance is increased in thermal bands to reduce thermal detection, then reflectance in visible and nIR bands increases, compromising camouflage performance
Solution Approach 1:
Different regions of the construct have different reflectance properties optimized for specific spectral bands. The first substrate has high reflectance in visible/nIR bands for camouflage but controlled reflectance in thermal bands. The second substrate has controlled reflectance in visible/nIR bands but high reflectance in thermal bands. This local quality differentiation resolves the contradiction by making reflectance band-specific rather than uniform across all wavelengths.
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 construct achieves controlled reflectance and transmission properties, reducing detection in thermal bands while maintaining performance in visible and nIR bands, providing enhanced camouflage capabilities across multiple EM bands.
Implementation Method 1
a first component that is a thermally transparent, visually opaque substrate comprising a polymeric layer and colorant
Implementation Method 2
The construct has an average reflection of i) less than about 70% in the wavelength range of 400-600 nm, ii) less than about 70% in the wavelength range of 700-1000 nm
Implementation Method 3
a second component that is a thermally reflective layer comprising a low emissivity component adjacent a surface of the thermally transparent, visually opaque substrate
Implementation Method 4
greater than about 25% in the wavelength range of 3-5 μm, and iv) greater than about 25% in the wavelength range of 9-12 μm
Data Source
AI summary
A selectively reflective construct, and a method for making the construct, are described. In one embodiment reflectance, transmission and absorption properties may be controlled in multiple electromagnetic bands. A construct is described comprising a) a thermally transparent, visually opaque substrate comprising a polymeric material and a colorant, and b) a thermally reflective layer comprising a low emissivity component.