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US 4,906,886 AGranted
Ultrasound sensor
AssigneeSiemens Aktiengesellschaft
InventorsFritz Breimesser, Bernd Granz, Bertram Sachs
Life of this patent
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Abstract
An ultrasound sensor is used for measuring the sound pressure amplitude in the focal range of focused ultrasound shock waves. The sensor contains a polymer foil which is piezoelectrically activated in one region and is coupled to electrodes which are physically separated from the region. The polymer foil is arranged in a hollow plastic cylinder with its flat surface sides parallel to the central longitudinal axis of the hollow cylinder. By this measure, interfering diffraction effects are reduced and miniaturization of the ultrasound sensor is achieved.
Claims12
An ultrasound sensor, comprising:
- (a) a hollow plastic cylinder having a central longitudinal axis;
- (b) a polymer foil having opposite flat surface sides and a piezoelectrically activated subregion, said polymer foil being fastened in a freely supported manner to said hollow cylinder with said opposite flat surface sides parallel to the central longitudinal axis;
- and
- (c) a plurality of electrodes physically separated from said piezoelectrically activated subregion of the polymer film and electrically coupled to said subregion.
1 more element
Dependencies are inferred from the claim text.