21 September 2011 Employing the conventional edge-lighting technology into ultraviolet-range: a preliminary study by optical simulation
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Proceedings Volume 8170, Illumination Optics II; 81700J (2011); doi: 10.1117/12.898712
Event: SPIE Optical Systems Design, 2011, Marseille, France
Within the framework of a project conducted together with an industrial partner, a self-disinfecting operation interface with a glass panel is being developed. The concept of self-disinfection is based on the exploitation of the photocatalytical effect induced by a TiO2-coating on the glass surface under UV(A) light, which would make the touch screen antimicrobial. High-power UV-LEDs instead of conventional UV-lamps have been employed as light source. The main goal and challenge of the optical design is to generate an efficient and preferably homogeneous UV field on the TiO2-coated side while keeping the UV-LEDs concealed, i.e. invisible to the user. Therefore common backlighting systems have been used as reference and modified to meet the concrete requirements. Primary analysis and optical simulations have been performed with the software LightTools®. Several patterns for light redirection (i.e. 3D-spherical texture, 3D-rectangular texture and 2D-circular serigraph) have been investigated, compared and evaluated. Finally the pattern design which both fulfills all the predefined boundary conditions and simultaneously reduces the costs has been chosen.
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Linchao Ye, Paola Belloni, Knut Möller, "Employing the conventional edge-lighting technology into ultraviolet-range: a preliminary study by optical simulation", Proc. SPIE 8170, Illumination Optics II, 81700J (21 September 2011); doi: 10.1117/12.898712; https://doi.org/10.1117/12.898712


Ultraviolet radiation

Light emitting diodes

Optical simulations

Titanium dioxide

Light sources


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