Electro-magnetic acoustic transducer (EMAT) for both lamb and shear horizontal wave transduction
US10502714B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2017 |
| Grant date | Dec 10, 2019 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0427
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electro-magnetic acoustic transducer (EMAT) generates both Lamb waves and shear horizontal (SH) waves or Lamb waves only. In configurations, the EMAT includes first and second coils shifted in alignment relative to one another and a magnet array overlaid over the coils. The EMAT generates a Lamb wave when the first coil is excited with an electrical current and generates a SH wave when the second coil is excited with an electrical current. In other configurations, the EMAT includes a coil and a magnet array which are movable relative to one another between a first position and a second position shifted in alignment relative to one another. The EMAT generates a Lamb wave when the coil is excited with an electrical current while in the first position and generates a SH wave when the coil is excited with an electrical current while in the second position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.