No abstract

The results of investigation of an internal friction in the piezoelectric elements used in electro-acoustic transducers are presented in this paper.

No abstract

The new technologies of synthesis of piezoceramic sensors are described in article. For the first time design of piezoelectric transducers and sensors consider a relative position of vectors of the polarisation op in a piezoelement force and a vector of an electric field (spatial energy force piezoelement structure). Besides, the arrangement of electrodes on a piezoelement surface also leads to change of dynamic characteristics of the sensor. The technology on the basis of a spatial electromechanical feedback allows to create sensors with the reduced error and expanded bandwidth.Inclusion of a piezoelement scheme of the electric filters allows it to get sensors with filter dynamic characteristics. As the piezoelement usually represents an electromechanical oscillatory system, joining it to mechanical or electric elements changes its characteristics.Increase of the level of an output signal and expansion of a working frequencies range can be reached by using the excitation signal of the piezoelement in the form of a meander.

No abstract