DEVICE FOR ELIMINATING SURFACE-FORMED HOAR FROST, IN PARTICULAR ON AN OPTICAL OR RADIO-ELECTRIC WINDOW

摘要

abstract description of the system to remove the frost formed in a wall surface.in particular, a radio or optical window device comprises: a piezoelectric material (10) with a mechanically cooperating with the active surface of a vibrating wall off.and means of polarization of the piezoelectric material with a source of alternating voltage (21) and electrodes (20, conductive or semiconductor(20) placed in contact with the material in a geometry that would lead to a in the direction of vibration of the acoustic wave is oriented lengthwise (1)(2) and / or transversely to the surface (3) to address, and the amplitude of the vibration is sufficient, respectively, and / or break off the frost deposit is formed on the surface.the piezoelectric material (10) is preferably a ferroelectric polymer such as a polymer from the group consisting of pvf2, pvf2 trfe, pvdcn vac.the pvf2 - ter, and mixtures of these polymers with each other and / or with pmma, pema.the electrodes (20, 20 ') are preferably adhered on a thin layer of piezoelectric material deposited on the surface.and the material is then advantageously a material from the group consisting of tin oxide indium resistive, conductive polymers in a matrix.the hydrogenated amorphous silicon and polyimide with organic salts. (see figure 1).