Front surface matched piezoelectric ultrasonic transducer array with wide field of view
US4211948A · kind A · utility
187Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1978 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | Nov 8, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2695
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic transducer array with high sensitivity, for use in water tanks and with human subjects in steered beam imagers to make wide angle sector scans, has narrow transducer elements and one or more quarter-wavelength impedance matching layers on the front surface of each element. The matching layers as well as the piezoelectric ceramic are completely cut thorugh and guide acoustic energy incident at any angle to the ceramic. A continuous covering or wear plate is attached to the matching layers and a continuous damping material can cover the backs of the elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.