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Proceedings Paper

Light-switching behavior of nonmechanical shading devices
Author(s): W. Koerner; S. Hauck; H. Scheller; A. Beck; Jochen Fricke
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Paper Abstract

We investigated the light switching properties of non-mechanical shading devices, namely liquid crystal films and thermochromic layers. These systems can be switched between a transparent and a scattering state either by application of an electric voltage or surpassing a characteristic switching temperature. This paper presents data on the light scattering properties of such materials, i.e. the change in diffuse transmittance due to switching, the light scattering efficiency and the size of the scattering entities. Radiative transport calculations were performed in order to describe the light scattering properties of the liquid crystal films and to determine the optimization potential of these layers. For comparison data of an electrochromic layer, which has a transparent and an absorbing state, are shown.

Paper Details

Date Published: 9 September 1994
PDF: 11 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185376
Show Author Affiliations
W. Koerner, Physikalisches Inst. der Univ. Wuerzburg (Germany)
S. Hauck, Physikalisches Inst. der Univ. Wuerzburg (Germany)
H. Scheller, Physikalisches Inst. der Univ. Wuerzburg (Germany)
A. Beck, Physikalisches Inst. der Univ. Wuerzburg (Germany)
Jochen Fricke, Physikalisches Inst. der Univ. Wuerzburg (Germany)


Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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