Ultrasonic shear wave transducer
US4295214A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1979 |
| Grant date | Oct 13, 1981 |
| Priority date | — |
| Expiry date | Aug 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0428
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is an electromagnetic acoustic transducer, including an electrical conductor adapted to carry an alternating current in a current plane, the current being conveyed by the conductor in uniformly spaced, parallel, and alternate directions at any instant, and a source of magnetic flux positioned to direct a static magnetic field parallel to the alternate directions, the transducer thereby being adapted to generate or detect a horizontally polarized shear wave in a ferromagnetic material. The transducer may be made unidirectional by adding a second electrical conductor adapted to carry a second alternating current 90.degree. out of phase with respect to the first alternating current in a second current plane substantially coplanar with the first current plane, the second current being carried by the second conductor at any instant in parallel and alternate directions spaced by the same uniform amount, the second conductor being parallel to but staggered from the first conductor by half of the uniform amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.