Ultrasound sensor

US4906886A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Fritz Breimesser · Nürnberg, DE
• Bernd Granz · Oberasbach, DE
• Bertram Sachs · Regensburg, DE

Key dates

• Filing date: Mar 8, 1989
• Grant date: Mar 6, 1990
• Expiry date: Mar 8, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S310/80
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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.