Electrical impedance of flat piezotransducer loaded on environment through the contact layer fluid

On the basis of the piezoeffect equations an expression for an electrical impedance of the flat piezotransducer loaded on the environment through a contact layer of a liquid has been received. It is shown that presence of a thin strongly reflecting contact layer leads to that the spectrum of natural frequencies becomes not the equidistant, and good quality of oscillations10 times more, than in a case flat piezotransducer loaded immediately on the environment.