Inherent delay line ultrasonic transducer and systems
US4452084A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1982 |
| Grant date | Jun 5, 1984 |
| Priority date | — |
| Expiry date | Oct 25, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K11/32
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An ultrasonic transmitting and/or receiving transducer is disclosed which includes a piezoelectric body with electrodes at opposite faces thereof. At least one of the electrodes is in the form of an elongated strip conductor such that the transducer also functions as a lossy delay line. The beam pattern of the transducer is dependent upon the delay of the delay line. A high permeability member such as a ferrite body is located adjacent the elongated strip conductor to increase the distributed inductance of the delay line and, consequently, the delay thereof. The permeability of the ferrite body is controlled by use of a drive coil adjacent thereto. By time varying the drive current to the coil, the acoustic beam pattern is time varied. By using a spiral shaped elongated strip conductor on a cylindrical shaped piezoelectric body, a focusing transducer is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.