Electronically focused ultrasonic transmitter
US4307613A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1979 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Jun 14, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8922
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An array of transducer segments is arranged in columns, each of which has a multiplicity of segments. The segments are wired to permit excitation by one or the other of two opposite phases of high-frequency signal, and groups of segments can be excited with the same phase to approximate the shape of an annular-ring phase-reversal zone plate. By changing the groupings of the elements that are similarly excited, the position of the focal region produced by the zone plate is translated in lateral position. A ferrite-core transformer is conveniently employed for both phase splitting and addition of the echo signals received by the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.