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Transparent self-cleaning dust shield

United States Patent

June 28, 2005
View the Complete Patent at the US Patent & Trademark Office
A transparent electromagnetic shield to protect solar panels and the like from dust deposition. The shield is a panel of clear non-conducting (dielectric) material with embedded parallel electrodes. The panel is coated with a semiconducting film. Desirably the electrodes are transparent. The electrodes are connected to a single-phase AC signal or to a multi-phase AC signal that produces a travelling electromagnetic wave. The electromagnetic field produced by the electrodes lifts dust particles away from the shield and repels charged particles. Deposited dust particles are removed when the electrodes are activated, regardless of the resistivity of the dust. Electrostatic charges on the panel are discharged by the semiconducting film. When used in conjunction with photovoltaic cells, the power for the device may be obtained from the cells themselves. For other surfaces, such as windshields, optical windows and the like, the power must be derived from an external source. One embodiment of the invention employs monitoring and detection devices to determine when the level of obscuration of the screen by dust has reached a threshold level requiring activation of the dust removal feature.
Mazumder; Malay K. (Little Rock, AR), Sims; Robert A. (Little Rock, AR), Wilson; James D. (Benton, AR)
Board of Trustees of the University of Arkansas (Little Rock, AR)
10/ 253,625
September 24, 2002
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under the terms of DE-FG02-98ER45730 awarded by the Department of Energy/EPSCoR and by the Arkansas Space Grant Consortium which is partially funded by the National Aeronautics and Space Administration/EPSCoR under the terms of Grant No. NGT5-40063. The Government has certain rights in the invention.