A review of materials for spectral design coatings in signature management applications
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Q1. What are the contributions mentioned in the paper "A review of materials for spectral design coatings in signature management applications" ?
A literature study was performed probing research databases for advancements.
Q2. What are the future works mentioned in the paper "A review of materials for spectral design coatings in signature management applications" ?
Therefore, in order to spend limited military R & D funding more effectively, and to meet more quickly the survivability requirements of signature management systems from an increased threat, there is a need to study the balancing process depicted in the introduction.
Q3. What are the optical consequences of a photonic crystal?
The optical consequences are suppression of emission in the crystal and total reflectance of light in a wavelength region determined by the lattice constant of the structure and with a broadening corresponding to the band gap.
Q4. What is the third direction of development?
A third direction of development is flexible and controllable electro-chromic devices utilizing conducting polymers, potentially applied as decals on military platforms.
Q5. What are some examples of interesting optical properties?
In biology there are examples of interesting optical properties, such as ageresistant and environmentally friendly colors, originating from complex structures made out of relatively simple materials.
Q6. What is the way to achieve controllability?
Controllability for near real-time applications may be obtained using electro-chromic devices based on conducting polymers, or further in the future using tunable 3D photonic crystal.
Q7. What is the main reason for the blending of artificial and natural fibers in uniforms?
The blending of artificial and natural fibers in fabric for modern uniforms normally gives NIR-reflectance that is too high when compared to natural background,33 which is why new pigments are being developed for lowering NIR-reflectivity, such as NIR-absorbing Vat dyes.34
Q8. What is the emissivity of a layer of BeO on a BN?
Ribbing showed in 1993 that a 2.5μm layer of BeO on BN could result in a coating with low emissivity, lower than 0.2 on average, covering the width of the LWIR atmospheric window58.
Q9. What is the nature of the coloration of mimicked structures?
The coloration of mimicked structures will, as in the natural case, arise through common physical mechanisms such as thin film or multilayer interference, diffraction gratings, scattering (coherent and incoherent) and photonic crystals etc., depending on the composition of the building blocks.
Q10. What is the average transmittance of a TC coating?
The mid-luminous transmittance, ΔT, is reported to be 55% with maximum transmittance around 70%, and the time from colored to bleached state is about 30s.
Q11. What is the way to reduce VIS-NIR?
Incorporating pigments in the polymer fiber at the fiber forming process, however, seems to be feasible since this can be combined with textile printing with reactive dyes for VIS-NIR performance.
Q12. What is the way to tailor the reflectivity of multilayers?
Breaking metal based multilayers into pigments is one approach to tailoring the reflectivity, but no paint coating system reported yet meets the potential of the respective components.
Q13. What is the challenge of combining pigments and binders in a system?
The challenge is to combine pigments and binders in a system where the properties of the components create a synergetic optical response throughout the spectrum from VIS to TIR.
Q14. What is the utility of spectral design?
The utility of spectral design is also assessed to benefit from research into other applications and from commercial interest in nano-technology, boosted, for example, by the electronics, construction and energy industries.
Q15. What is the likely explanation for the low emissivity of pure metal pigments?
Hallberg et al. conclude that among pure metal pigments, only Al, in combination with polymer-based binders, gives acceptably low emissivity.
Q16. What is the effect of the optical modeling of the polymerized colloidal crystalline array?
75,76 Kadiyala et al. demonstrate, through optical modeling of polymerized colloidal crystalline array (PCCA) structures, a novel concept that has the potential to enable the use of tunable 3D photonic crystals for adaptive camouflage.
Q17. What is the way to improve the bandwidth of a mantle cloak?
A low profile of an ultrathin mantle cloak improves bandwidth limitations; however, little or nothing is said about the robustness to losses.