ACOUSTIC SENSOR Russian patent published in 2013 - IPC H04R17/00 

FIELD: measurement equipment.

SUBSTANCE: acoustic sensor includes a piezoelectric substrate, a common electrode located on one side of the piezoelectric substrate, a set of the first electrode structures located on opposite side of the piezoelectric substrate relative to the common electrode; with that, each first electrode structure is located radially relative to a conditional central point and includes a set of electrode elements located in circumferential directions. With that, the above first electrode structures are located with possibility of choosing one or more groups of electrode elements from the specified first electrode structure so that the above first electrode structure can be tuned to the pre-determined frequency range, and each of the above first electrode structures is arranged pre-determined radial direction relative to the above conditional central point so that each of the above first electrode structures can be tuned to signals having the corresponding directivity. In addition, the sensor is equipped with the second and the third electrode structures and can operate in the frequency range of 10 kHz to 20 MHz using directional Lamb waves.

EFFECT: improving accuracy of determination of a place of failure.

10 cl, 6 dwg