Patent · US Expired

Ultrasonic transducer for the determination of the acoustic power of a focused ultrasonic field

US4764905A · kind A · utility

20Cited by

8References

3Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Bernd Granz · Oberasbach, DE
Peter Krammer · Heidelberg, DE
Bertram Sachs · Regensburg, DE

Key dates

Filing date	Dec 12, 1986
Grant date	Aug 16, 1988
Priority date	—
Expiry date	Dec 12, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S310/80
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The invention concerns an ultrasonic transducer for the determination of the acoustic power of an ultrasonic field (1) focused at a point (F). According to the invention, an ultrasonic transducer 2 contains a support structure (4) which has the shape of a spherical cup and whose center coincides with the focus (F) of the focused ultrasonic field (1), and a piezoelectric polymer foil (6) equipped on its respective surfaces (62, 64) with a conductive layer (8) is attached to said support structure. These measures ensure that the acoustic charge vibrations within the area formed by the piezoelectric polymer foil (6) are at least approximately in phase and that the respective surface charge vibrations can be measured with the aid of a single, continuous electrode without partial mutual cancellation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.