1 results about "Ferroelectret" patented technology

The invention relates to a transverse anti-symmetric elastic wave excitation device, which comprises a piezoelectric vibration assembly, a connecting and fixing piece and a wiring group of the piezoelectric vibration assembly. The piezoelectric vibration assembly comprises two identical piezoelectric electret films, namely a first piezoelectric electret film and a second piezoelectric electret film of which the short sides are aligned with each other. The connecting and fixing piece is used for fixing the piezoelectric vibration assembly to the surface of a structure and ensuring that the piezoelectric electret films are insulated from the surface of the structure. The first piezoelectric electret film and the second piezoelectric electret film are respectively connected with excitation voltage signals which are provided externally and have a phase difference Pi through the wiring group so as to convert the excitation voltage signals into mechanical vibration, and the mechanical vibration is conducted to the surface of the structure through the connecting and fixing piece to complete excitation of transverse anti-symmetric elastic waves. Compared with the prior art, the transverse anti-symmetric elastic wave excitation device has the advantages that the structure is simple, preparation is convenient, and the blank that there is no transverse anti-symmetric elastic wave excitation device at present is filled.