Detection device of the foreign bodies present in the outer surface of a window pane is equipped with such a device and the window is intended to be equipped with a detection device of the ultrasonic.

摘要

P detection device of the foreign bodies present in the outer surface of a window, said device being intended to be associated with a window comprising at least a first plate having a first thickness, a second plate having a second thickness of less than said first thickness, said plates being assembled together by a connecting layer, said device comprising a transducer that can be transmitted, via one face of the transmitter / receiver, an ultrasonic signal incident having a wavelength λ in said plates, the thickness of the first plate being equal to k.lambda / 2, where k is an integer, the transducer can also produce a detection signal, characterized in that said transducer comprises a plate fixed on said face of the transmitter / receiver, said plate being intended to be fixed on said second plate, and in that said strip has a third thickness such that the sum of the second and third thickness is substantially equal to k ′ .lambda / 2, where k ′ is a second integer. / p