Hybrid piezoelectric and magnetostrictive acoustic wave transducer
US4443731A · kind A · utility
Inventors
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B1/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The transducer is one that combines magnetostrictive and electrostrictive/piezoelectric transducer effects to form a transducer with improved performance. A transducer is provided which the two aforementioned effects are mechanically coupled in series allowing cancellation of the motion at one end of the transducer and maximization of the motion at the other end thereof. In an alternate construction, respective transducer types are connected mechanically in parallel in which the pressure may be cancelled on one side and increased on the other side of the transducer array. Either the velocity of pressure cancellation leads to a transducer element or transducer array with unidirectional properties. This device described herein may also be used as an intensity measuring instrument or as an acoustic sound repeater. Moreover, because the magnetostrictive part of the transducer is inductive and the piezoelectric part is capacitive, they may be used together to electrically tune each other and thus not require additional electrical elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.