KEYWORDS: Camouflage, RGB color model, Digital cameras, Digital imaging, Printing, Reflectivity, Visualization, Coating, Spectrophotometry, Defense and security
Digital Colour Management System (DCMS) and its application to new adaptive camouflage system are presented in this paper. The DCMS is a digital colour rendering method which would allow for transformation of a real image into a set of colour pixels displayed on a computer monitor. Consequently, it can analyse pixels’ colour which comprise images of the environment such as desert, semi-desert, jungle, farmland or rocky mountain in order to prepare an adaptive camouflage pattern most suited for the terrain. This system is described in present work as well as the use the subtractive colours mixing method to construct the real time colour changing electrochromic window/pixel (ECD) for camouflage purpose. The ECD with glass/ITO/Prussian Blue(PB)/electrolyte/CeO2-TiO2/ITO/glass configuration was assembled and characterized. The ECD switched between green and yellow after ±1.5 V application and the colours have been controlled by Digital Colour Management System and described by CIE LAB parameters.
In this paper we have been experimentally investigated thermo-optic properties of a Co nanofluid filled mictrostructured
fiber (MSF). We have prepared samples based on pure chemical compounds: cyklohexane and toluene and both of them
were used as solvents for Co nanoparticles. MSF filled by cyklohexane and its mixture with Co nanoparticles worked on
weakly guided regime and toluene based MSFs samples became the solid core bandgap fibers. We have measured
temperature transmission spectral characteristics within the range of 18°C-80°C. Temperature sensitivity of Co
nanofluid based on cyklohexane were the strongest in third telecommunication window and reached 0.12dB/°C with
dynamic range of 7dB. For toluene based samples we observed bandgaps shifts from the longer to the shorter
wavelengths. Temperature sensitivity of these type of samples were close to -5nm/°C.
In this paper relation between the diffraction efficiency in LC dye doped cell in two wave mixing system and the applied voltage parameters had been described. The goal of this work was increase of diffraction efficiency using low frequency AC voltage. The LC cells used in the experiments were filled with pure and dye-doped liquid crystal mixtures. In this system we obtained diffraction efficiency increasing about five to eight times.
Mechanism of holographic dynamic grating recording in a thin cell with dye doped nematic liquid crystal under laser light has been proposed. Nematic liquid crystal with dye is sandwiched between two coating glass plates covered by ITO conductive and polyimide orientation layers. In this experiment, two interfering laser beams induced spatial modulation of refraction index and form interference pattern in the liquid crystal cell. The recording mechanism is linked with DC electric field driven reorientation of nematic director and induces the bulk photoconductivity of the system.
We have described the relation between LC parameters and induced diffraction gratings recorded by light intensity pattern in dye-doped nematic liquid crystals sandwiched between two coating glass plates covered with ITO conductive and polyimide orientation layers. In our investigations we used the LC cells containing planary oriented nematic mixtures (low-angle rubbing, tilt 1.5 - 2%) doped with the antraquinone dyes (0.1 - 1% w/w). Nematic liquid crystal mixtures with different electrooptical threshold, optical anisotropy, viscosity and conductivity have been investigated. The influence of resistivity, optical anisotropy of LC mixtures and polyimide layers on diffraction efficiency and other parameters have been discussed.
Self-diffraction of light on transient holographic index gratings has been measured in dye-doped twisted nematic liquid-crystal cells. The mechanism of gratings formation is connected with bulk photoconductivity which results in electric field induced torques causing local director axis reorientations. Time evolution of grating recording, voltage and polarization-configuration dependencies were examined. In the self-diffraction experiments the beam coupling effects were observed.
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