An electrooptical device is provided comprising at least one substrate, at least one pair of electrodes and at least one layer of an electrooptical material. The electrooptical material represents an optically anisotropic thin crystal film and contains molecules having aromatic rings and possessing a lattice with an interplanar spacing (Bragg's reflection) of 3.40.2 along one of optical axes. The electrooptical material has anisotropic refractive indices and/or anisotropic absorption coefficients that are depended on an electric field strength.

 
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> Systems and techniques for detecting the presence of foreign material

> Method and system for calibrating projectors to arbitrarily shaped surfaces with discrete optical sensors mounted at the surfaces
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