Wide pass band elastic wave omnidirectional transducer
US4862430A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H11/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Wide pass band elastic wave omnidirectional transducer. It comprises a magnetostrictive material membrane (34, 36) provided with two electrical connections at two diametrically opposite points. The potential difference between these connections is proportional to the elastic wave transmitted or received by said membrane. A continuous polarization means of the magnetostrictive membrane is also provided. It comprises a high magnetic permeability part (40, 42), whose shape substantially corresponds to that of the membrane and which is placed in the vicinity of the latter, and a permanent magnet (38) in contact with said part. Application to the transmission of high frequency elastic waves in water (hydrophone) and to high fidelity sound reproduction in air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.