A solid optical sky-sun diffuser which comprises a transparent solid matrix embedding a dispersion of transparent nanoparticles having an average size d in the range 10nm ≤ d ≤ 240nm; wherein: the ratio between the blue and red scattering optical densities γ ≡ Log[T (450nm)]/ Log[T (630/nm)] of said diffuser falls in the range 5 ≥ γ ≥ 2.5, where T(λ) is the Monochromatic Normalized Collinear Transmittance; in at least one propagation direction, said Monochromatic Normalized Collinear Transmittance is T(450nm) ≥ 0.4; in at least one propagation direction said Monochromatic Normalized Collinear Transmittance is T(450nm) ≤ 0.9 said propagation direction being the same or different from that at which said Monochromatic Normalized Collinear Transmittance is T(450nm) ≥ 0.4.
Di Trapani, P., Simonutti, R., Averchi, A., Pigazzini, M. (2008)Optical sky-sun diffuser. . Brevetto No. MI2008A001135.
Optical sky-sun diffuser
SIMONUTTI, ROBERTO;
2008
Abstract
A solid optical sky-sun diffuser which comprises a transparent solid matrix embedding a dispersion of transparent nanoparticles having an average size d in the range 10nm ≤ d ≤ 240nm; wherein: the ratio between the blue and red scattering optical densities γ ≡ Log[T (450nm)]/ Log[T (630/nm)] of said diffuser falls in the range 5 ≥ γ ≥ 2.5, where T(λ) is the Monochromatic Normalized Collinear Transmittance; in at least one propagation direction, said Monochromatic Normalized Collinear Transmittance is T(450nm) ≥ 0.4; in at least one propagation direction said Monochromatic Normalized Collinear Transmittance is T(450nm) ≤ 0.9 said propagation direction being the same or different from that at which said Monochromatic Normalized Collinear Transmittance is T(450nm) ≥ 0.4.
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