Electromagnetic transducer
US4127035A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Sep 2, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0422
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnet is used to create a static magnetic field adjacent to the surface of a conductive material. At least one conductor runs through the magnetic field. When a pulse of current flows through the conductor, an elastic wave is generated in the material. In a preferred embodiment, a row of individual permanent magnets is used to create a periodic magnetic field. One side of a coil is placed in the periodic magnetic field so that a sheet of current moves transverse to the magnetic field when a pulse of current flows through the coil. When the coil is oriented parallel to the row of magnets, a horizontal shear wave is generated in the material. When the coil is oriented transverse to the row of magnets, a Lamb wave is generated in the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.